Date   

Re: we moved...

Richard Knoppow
 

----- Original Message -----
From: "Kees Brandenburg" <workshops@polychrome.nl>
To: "The alternative photographic processes mailing list" <alt-photo-process-list@lists.altphotolist.org>
Sent: Thursday, March 06, 2014 11:00 AM
Subject: [Alt-photo] we moved...


hi all,

We have changed server and it is my great pleasure to see we also have some 'lost' people back on board!
I am now getting three copies of each post, I think one to each of the addresses I used. I will have to cancel two of them.


--
Richard Knoppow
Los Angeles
WB6KBL
dickburk@ix.netcom.com


Re: we moved...

Fernando Cruz
 

Gracias

Fernando Cruz
57 1 3108686025
www.fotografiacolombiana.com

-----Original Message-----
From: Loris Medici <mail@loris.medici.name>
To: The alternative photographic processes mailing list <alt-photo-process-list@lists.altphotolist.org>
Sent: jue, 06 mar 2014 6:58 PM
Subject: Re: [Alt-photo] we moved...

Thanks Kees!

Regards,
Loris.


2014-03-06 21:00 GMT+02:00 Kees Brandenburg <workshops@polychrome.nl>:

hi all,

We have changed server and it is my great pleasure to see we also have
some 'lost' people back on board!
I must appologize for this inconvenience all these months. For some never
known reason the old list IP was blacklisted by a few US providers.
Our old provider's support staff wasn't able to sort this out. Mail for
about 20 list members never reached their mailboxes.
Some of them have contacted me in the past to sort this out and sometimes
changed their subscription address.

There is a slight change in the address of the new subscribe/unscribe
form, but to make things as easy as possible everything can easiy be
accessed from the main domains homepage: http://altphotolist.org
A link to that page is at the bottom of every email from the list you
receive.

shortcuts
to the subscription form: http://altphotolist.org/subscribe
to chanche your opstions: http://altphotolist.org/options
to unsubscribe: http://altphotolist.org/subscribe

If you have links on your personal site to the list please use the new
links above!
Please let me know if something is not as it should be...

Kees
_______________________________________________
Alt-photo-process-list | altphotolist.org
_______________________________________________
Alt-photo-process-list | altphotolist.org
&


Re: we moved...

cyanodebergerac
 

Thanks Kees!

Regards,
Loris.


2014-03-06 21:00 GMT+02:00 Kees Brandenburg <workshops@polychrome.nl>:

hi all,

We have changed server and it is my great pleasure to see we also have
some 'lost' people back on board!
I must appologize for this inconvenience all these months. For some never
known reason the old list IP was blacklisted by a few US providers.
Our old provider's support staff wasn't able to sort this out. Mail for
about 20 list members never reached their mailboxes.
Some of them have contacted me in the past to sort this out and sometimes
changed their subscription address.

There is a slight change in the address of the new subscribe/unscribe
form, but to make things as easy as possible everything can easiy be
accessed from the main domains homepage: http://altphotolist.org
A link to that page is at the bottom of every email from the list you
receive.

shortcuts
to the subscription form: http://altphotolist.org/subscribe
to chanche your opstions: http://altphotolist.org/options
to unsubscribe: http://altphotolist.org/subscribe

If you have links on your personal site to the list please use the new
links above!
Please let me know if something is not as it should be...

Kees
_______________________________________________
Alt-photo-process-list | altphotolist.org


Re: we moved...

ender100
 

Kees,

Thanks for your hard work on this! It will be nice to be back in touch!

If people have received this email, do they still need to go to the URL below to subscribe or are we already subscribed?

Best Wishes,
Mark Nelson

Welcome to the Precision Digital Negatives Home!
PDNPrint : Precision Digital Negatives Forum
Mark I. Nelson Photography - Welcome

On Mar 6, 2014, at 1:00 PM, Kees Brandenburg <workshops@polychrome.nl> wrote:

hi all,

We have changed server and it is my great pleasure to see we also have some 'lost' people back on board!
I must appologize for this inconvenience all these months. For some never known reason the old list IP was blacklisted by a few US providers.
Our old provider's support staff wasn't able to sort this out. Mail for about 20 list members never reached their mailboxes.
Some of them have contacted me in the past to sort this out and sometimes changed their subscription address.

There is a slight change in the address of the new subscribe/unscribe form, but to make things as easy as possible everything can easiy be accessed from the main domains homepage: http://altphotolist.org
A link to that page is at the bottom of every email from the list you receive.

shortcuts
to the subscription form: http://altphotolist.org/subscribe
to chanche your opstions: http://altphotolist.org/options
to unsubscribe: http://altphotolist.org/subscribe

If you have links on your personal site to the list please use the new links above!
Please let me know if something is not as it should be...

Kees
_______________________________________________
Alt-photo-process-list | altphotolist.org


we moved...

Kees Brandenburg <workshops@...>
 

hi all,

We have changed server and it is my great pleasure to see we also have some 'lost' people back on board!
I must appologize for this inconvenience all these months. For some never known reason the old list IP was blacklisted by a few US providers.
Our old provider's support staff wasn't able to sort this out. Mail for about 20 list members never reached their mailboxes.
Some of them have contacted me in the past to sort this out and sometimes changed their subscription address.

There is a slight change in the address of the new subscribe/unscribe form, but to make things as easy as possible everything can easiy be accessed from the main domains homepage: http://altphotolist.org
A link to that page is at the bottom of every email from the list you receive.

shortcuts
to the subscription form: http://altphotolist.org/subscribe
to chanche your opstions: http://altphotolist.org/options
to unsubscribe: http://altphotolist.org/subscribe

If you have links on your personal site to the list please use the new links above!
Please let me know if something is not as it should be...

Kees


Re: test => please ingnore

ender100
 

That's not surprising Don!

Mark Nelson
www.PrecisionDigitalNegatives.com
PDNPRint Forum @ Yahoo Groups
www.MarkINelsonPhoto.com

sent from my iPhonetypeDeviceThingy

On Mar 6, 2014, at 11:01 AM, Don Bryant <donsbryant@gmail.com> wrote:

Mark,

I thought you knew ... your were voted off the list by secret ballot ... ;)
On Mar 6, 2014 11:50 AM, "Mark Nelson" <ender100@aol.com> wrote:

I know, but I thought Kees might want to know since I've been unable to
receive posts for some reason for over a year.

Mark Nelson
www.PrecisionDigitalNegatives.com
PDNPRint Forum @ Yahoo Groups
www.MarkINelsonPhoto.com

sent from my iPhonetypeDeviceThingy

On Mar 6, 2014, at 10:05 AM, John Brewer <john@johnbrewerphotography.com>
wrote:

But you didn't do as you were told, to ignore it! ;)


On 6 March 2014 16:00, Mark Nelson <ender100@aol.com> wrote:

Great! This is the first post I have gotten in many months !!!!!!

Mark Nelson
www.PrecisionDigitalNegatives.com
PDNPRint Forum @ Yahoo Groups
www.MarkINelsonPhoto.com

sent from my iPhonetypeDeviceThingy

On Mar 6, 2014, at 6:44 AM, Kees Brandenburg <workshops@polychrome.nl
wrote:

test 01 => please ingnore
_______________________________________________
Alt-photo-process-list | altphotolist.org
_______________________________________________
Alt-photo-process-list | altphotolist.org


--
John Brewer
www.johnbrewerphotography.com
workshops:equipment sales:chemistry sales
_______________________________________________
Alt-photo-process-list | altphotolist.org
_______________________________________________
Alt-photo-process-list | altphotolist.org
_______________________________________________
Alt-photo-process-list | altphotolist.org


Re: test => please ingnore

Don Bryant
 

Mark,

I thought you knew ... your were voted off the list by secret ballot ... ;)

On Mar 6, 2014 11:50 AM, "Mark Nelson" <ender100@aol.com> wrote:

I know, but I thought Kees might want to know since I've been unable to
receive posts for some reason for over a year.

Mark Nelson
www.PrecisionDigitalNegatives.com
PDNPRint Forum @ Yahoo Groups
www.MarkINelsonPhoto.com

sent from my iPhonetypeDeviceThingy

On Mar 6, 2014, at 10:05 AM, John Brewer <john@johnbrewerphotography.com>
wrote:

But you didn't do as you were told, to ignore it! ;)


On 6 March 2014 16:00, Mark Nelson <ender100@aol.com> wrote:

Great! This is the first post I have gotten in many months !!!!!!

Mark Nelson
www.PrecisionDigitalNegatives.com
PDNPRint Forum @ Yahoo Groups
www.MarkINelsonPhoto.com

sent from my iPhonetypeDeviceThingy

On Mar 6, 2014, at 6:44 AM, Kees Brandenburg <workshops@polychrome.nl
wrote:

test 01 => please ingnore
_______________________________________________
Alt-photo-process-list | altphotolist.org
_______________________________________________
Alt-photo-process-list | altphotolist.org


--
John Brewer
www.johnbrewerphotography.com
workshops:equipment sales:chemistry sales
_______________________________________________
Alt-photo-process-list | altphotolist.org
_______________________________________________
Alt-photo-process-list | altphotolist.org


Re: test => please ingnore

John Brewer <john@...>
 

Oh. That happened to me and I switched to another email address. Maybe you
were banned for a year!

On 6 March 2014 16:50, Mark Nelson <ender100@aol.com> wrote:

I know, but I thought Kees might want to know since I've been unable to
receive posts for some reason for over a year.

Mark Nelson
www.PrecisionDigitalNegatives.com
PDNPRint Forum @ Yahoo Groups
www.MarkINelsonPhoto.com

sent from my iPhonetypeDeviceThingy

On Mar 6, 2014, at 10:05 AM, John Brewer <john@johnbrewerphotography.com>
wrote:

But you didn't do as you were told, to ignore it! ;)


On 6 March 2014 16:00, Mark Nelson <ender100@aol.com> wrote:

Great! This is the first post I have gotten in many months !!!!!!

Mark Nelson
www.PrecisionDigitalNegatives.com
PDNPRint Forum @ Yahoo Groups
www.MarkINelsonPhoto.com

sent from my iPhonetypeDeviceThingy

On Mar 6, 2014, at 6:44 AM, Kees Brandenburg <workshops@polychrome.nl
wrote:

test 01 => please ingnore
_______________________________________________
Alt-photo-process-list | altphotolist.org
_______________________________________________
Alt-photo-process-list | altphotolist.org


--
John Brewer
www.johnbrewerphotography.com
workshops:equipment sales:chemistry sales
_______________________________________________
Alt-photo-process-list | altphotolist.org
_______________________________________________
Alt-photo-process-list | altphotolist.org
--
John Brewer
www.johnbrewerphotography.com
workshops:equipment sales:chemistry sales


Re: test => please ingnore

ender100
 

I know, but I thought Kees might want to know since I've been unable to receive posts for some reason for over a year.

Mark Nelson
www.PrecisionDigitalNegatives.com
PDNPRint Forum @ Yahoo Groups
www.MarkINelsonPhoto.com

sent from my iPhonetypeDeviceThingy

On Mar 6, 2014, at 10:05 AM, John Brewer <john@johnbrewerphotography.com> wrote:

But you didn't do as you were told, to ignore it! ;)


On 6 March 2014 16:00, Mark Nelson <ender100@aol.com> wrote:

Great! This is the first post I have gotten in many months !!!!!!

Mark Nelson
www.PrecisionDigitalNegatives.com
PDNPRint Forum @ Yahoo Groups
www.MarkINelsonPhoto.com

sent from my iPhonetypeDeviceThingy

On Mar 6, 2014, at 6:44 AM, Kees Brandenburg <workshops@polychrome.nl>
wrote:

test 01 => please ingnore
_______________________________________________
Alt-photo-process-list | altphotolist.org
_______________________________________________
Alt-photo-process-list | altphotolist.org


--
John Brewer
www.johnbrewerphotography.com
workshops:equipment sales:chemistry sales
_______________________________________________
Alt-photo-process-list | altphotolist.org


Re: test => please ingnore

John Brewer <john@...>
 

But you didn't do as you were told, to ignore it! ;)

On 6 March 2014 16:00, Mark Nelson <ender100@aol.com> wrote:

Great! This is the first post I have gotten in many months !!!!!!

Mark Nelson
www.PrecisionDigitalNegatives.com
PDNPRint Forum @ Yahoo Groups
www.MarkINelsonPhoto.com

sent from my iPhonetypeDeviceThingy

On Mar 6, 2014, at 6:44 AM, Kees Brandenburg <workshops@polychrome.nl>
wrote:

test 01 => please ingnore
_______________________________________________
Alt-photo-process-list | altphotolist.org
_______________________________________________
Alt-photo-process-list | altphotolist.org
--
John Brewer
www.johnbrewerphotography.com
workshops:equipment sales:chemistry sales


Re: test => please ingnore

ender100
 

Great! This is the first post I have gotten in many months !!!!!!

Mark Nelson
www.PrecisionDigitalNegatives.com
PDNPRint Forum @ Yahoo Groups
www.MarkINelsonPhoto.com

sent from my iPhonetypeDeviceThingy

On Mar 6, 2014, at 6:44 AM, Kees Brandenburg <workshops@polychrome.nl> wrote:

test 01 => please ingnore
_______________________________________________
Alt-photo-process-list | altphotolist.org


Re: UV light box

Fernando Cruz
 

Estos son unos vinculos sobre las lamparas de uv

Uso una lampara con 16 tubos con dos ventiladores de computador para
crear una corriente de aire y evitar que se recaliente, pues tengo
entendido que el recalemtamiento hace que los tubos no funcionen bien

http://www.alternativephotography.com/wp/darkroom/building-a-uv-printer

http://www.alternativephotography.com/wp/processes/saltprints/salt-printing-exposing-the-print

http://www.alternativephotography.com/wp/darkroom/a-simple-economical-contact-printer
Fernando Cruz
Teléfono 57 -1 -2494755
Movil 57 - 3108686025
Codigo postal 110311
twitter @fotocolombiana
skype fernandocruzflorez
www.facebook.com/fotografia.colombiana

http://fernandocruzf.wordpress.com/

CV Fernando Cruz

www.fotografiacolombiana.com








2014-03-06 10:41 GMT-05:00 andy schmitt <aschmitt@aandy.org>:

WOW...The heat generated by the "slow" unit must be much less than the other one. Not a bad tradeoff for a 10% increase in exposure time.
I probably need to build another box for Peters Valley school of Craft's Photo Department and that would save me some $$$...always a nice thing for an NPO..
Thanks

Regards

Andy Schmitt PPA

Head of The New & Improved Photography Dept,
Peters Valley School of Craft
http://www.petersvalley.org/html/Photography.cfm



-----Original Message-----
From: Alt-photo-process-list [mailto:alt-photo-process-list-bounces@lists.altphotolist.org] On Behalf Of Darkrooms, Department of Art
Sent: Thursday, March 06, 2014 9:28 AM
To: alt-photo-process-list@lists.altphotolist.org
Subject: Re: [Alt-photo] UV light box

Here at the university we have two exposure units. Both use the same bulb
T12 40BL GE bulbs, 48" length. In our "fast unit" the bulbs are 1 inch apart and about 3" from the surface of the print. The "slow" unit has bulbs that are 6" apart and about 8" from the surface of the print. I find that both have even illumination throughout, but the slow unit has exposure length about 10% longer.

I hope that this is helpful! Good luck and happy printing.

Best,
Jennifer M. Gioffre
Teaching Support Specialist

Architecture Art and Planning
Cornell University
120 Tjaden Hall
Ithaca, NY 14853

o: 607-255-4207
f: 607-255-3462
Jmg393@cornell.edu
Darkroommanager@cornell.edu
AAPstore@cornell.edu




On 3/6/14 7:45 AM, "Jorj Bauer" <jorj@jorj.org> wrote:

I think you'll be fine.

I built a 24" square exposure box from 10x GE 22" blacklight enclosures
(it was what was readily available, so I ran with it). The prints sit
about 6" above the bulbs (I flip over my vacuum frame, so it's
upside-down during exposures).

The bulbs are spaced evenly across the box, which means they're a
little over 2" apart. But I wired it so that there are two power
switches, one for bulbs 1,3,5,7,9 and one for 2,4,6,8,10 (so that I can
turn off half the bank if I want to - I didn't know if this would be
overkill in terms of UV source or not).

I ran some tests using half of the bulbs - so, spaced a little over 4"
apart - and saw no problems. I've always used all of the lights since,
though. My average exposure time is around 6 minutes for most kinds of
prints.

The lights are GE model 10186, 15w blacklight T8s.

Hope that helps,
-- Jorj


On Mar 5, 2014, at 10:42 PM, Bob Cornelis <bob@colorfolio.com> wrote:

Thanks, Marek!

I¹m getting the impression my hope of putting the bulbs 4² apart is
very misguided and that they need to actually be quite close to each
other.

Regards
Bob


--------------------------------------
Color Folio
www.colorfolio.com

Become a fan of Color Folio on Facebook

http://www.facebook.com/ColorFolio

2550 Lewis Dr.
Sebastopol, CA 95472
707.824.8910
888.212.7060 toll free






On Mar 5, 2014, at 7:29 PM, Marek Matusz <marekmatusz@hotmail.com>
wrote:

Ok mine home build unit has the tubes 3" from the print this is the
distance from the edge of the tube. Distance between the tubes again
edge to edge of tubes is 0.5"

Sent from my iPhone

On Mar 5, 2014, at 6:41 PM, "Laura V" <laura@lavatop.com> wrote:

Hi Bob,
I was asking here about lighting a couple of months ago and got
this link from Kees Brandenburg showing his lightbox (maybe he's too
busy moving the list to see this thread) :)
http://polychrome.nl/techlog/simple-and-cheap-uv-unit

As you can see, the bulbs look pretty close together. I ended up
having a similar unit built (which took almost 3 months - I just
picked it up so haven't tried it yet!) I had the electrical part
done at a place specializing in fluorescent lighting and asked them
to put the bulbs as close together as was safe to do so. It's in the
trunk of my car down the street at the moment and it's snowing, so
I'll get back to you as to the exact distance. Mine has 10 bulbs and
the width is smaller than the 24" (60cm) length, so that is a lot
closer than 4 inches apart.

Perhaps someone else can fill us in whether they need to be that
close together, or maybe it's just a matter of the more bulbs the
quicker the exposure.

Best Regards,
Laura

On 3/4/14 9:43 PM, Bob Cornelis wrote:
I am planning on building a UV light box and have a question about
the layout of the bulbs. Upon the recommendation of a friend who
does alt process work I plan on buying these tubes:

http://www.1000bulbs.com/product/2220/F-20T12BL.html

My questions are how far apart should I mount these and how many
do I need to provide good coverage to expose up to 20x24² (though
I¹m not sure I¹d ever go over 16x20). I plan on having them about
4² above the surface of the prints.

Thanks
Bob

----------------------
707.824.8910
http://www.bobcornelis.com
http://bobcornelis.wordpress.com




_______________________________________________
Alt-photo-process-list | altphotolist.org
_______________________________________________
Alt-photo-process-list | altphotolist.org
_______________________________________________
Alt-photo-process-list | altphotolist.org
_______________________________________________
Alt-photo-process-list | altphotolist.org
_______________________________________________
Alt-photo-process-list | altphotolist.org
_______________________________________________
Alt-photo-process-list | altphotolist.org

_______________________________________________
Alt-photo-process-list | altphotolist.org


Re: UV light box

Darkrooms, Department of Art <darkroommanager@...>
 

The "fast" unit is very warm indeed. A 30min cyanotype exposure produces
a pretty warm print.

Best,
Jennifer M. Gioffre
Teaching Support Specialist

Architecture Art and Planning
Cornell University
120 Tjaden Hall
Ithaca, NY 14853

o: 607-255-4207
f: 607-255-3462
Jmg393@cornell.edu
Darkroommanager@cornell.edu
AAPstore@cornell.edu

On 3/6/14 10:41 AM, "andy schmitt" <aschmitt@aandy.org> wrote:

WOW...The heat generated by the "slow" unit must be much less than the
other one. Not a bad tradeoff for a 10% increase in exposure time.
I probably need to build another box for Peters Valley school of Craft's
Photo Department and that would save me some $$$...always a nice thing
for an NPO..
Thanks

Regards

Andy Schmitt PPA

Head of The New & Improved Photography Dept,
Peters Valley School of Craft
http://www.petersvalley.org/html/Photography.cfm



-----Original Message-----
From: Alt-photo-process-list
[mailto:alt-photo-process-list-bounces@lists.altphotolist.org] On Behalf
Of Darkrooms, Department of Art
Sent: Thursday, March 06, 2014 9:28 AM
To: alt-photo-process-list@lists.altphotolist.org
Subject: Re: [Alt-photo] UV light box

Here at the university we have two exposure units. Both use the same bulb
T12 40BL GE bulbs, 48" length. In our "fast unit" the bulbs are 1 inch
apart and about 3" from the surface of the print. The "slow" unit has
bulbs that are 6" apart and about 8" from the surface of the print. I
find that both have even illumination throughout, but the slow unit has
exposure length about 10% longer.

I hope that this is helpful! Good luck and happy printing.

Best,
Jennifer M. Gioffre
Teaching Support Specialist

Architecture Art and Planning
Cornell University
120 Tjaden Hall
Ithaca, NY 14853

o: 607-255-4207
f: 607-255-3462
Jmg393@cornell.edu
Darkroommanager@cornell.edu
AAPstore@cornell.edu




On 3/6/14 7:45 AM, "Jorj Bauer" <jorj@jorj.org> wrote:

I think you'll be fine.

I built a 24" square exposure box from 10x GE 22" blacklight enclosures
(it was what was readily available, so I ran with it). The prints sit
about 6" above the bulbs (I flip over my vacuum frame, so it's
upside-down during exposures).

The bulbs are spaced evenly across the box, which means they're a
little over 2" apart. But I wired it so that there are two power
switches, one for bulbs 1,3,5,7,9 and one for 2,4,6,8,10 (so that I can
turn off half the bank if I want to - I didn't know if this would be
overkill in terms of UV source or not).

I ran some tests using half of the bulbs - so, spaced a little over 4"
apart - and saw no problems. I've always used all of the lights since,
though. My average exposure time is around 6 minutes for most kinds of
prints.

The lights are GE model 10186, 15w blacklight T8s.

Hope that helps,
-- Jorj


On Mar 5, 2014, at 10:42 PM, Bob Cornelis <bob@colorfolio.com> wrote:

Thanks, Marek!

I¹m getting the impression my hope of putting the bulbs 4² apart is
very misguided and that they need to actually be quite close to each
other.

Regards
Bob


--------------------------------------
Color Folio
www.colorfolio.com

Become a fan of Color Folio on Facebook

http://www.facebook.com/ColorFolio

2550 Lewis Dr.
Sebastopol, CA 95472
707.824.8910
888.212.7060 toll free






On Mar 5, 2014, at 7:29 PM, Marek Matusz <marekmatusz@hotmail.com>
wrote:

Ok mine home build unit has the tubes 3" from the print this is the
distance from the edge of the tube. Distance between the tubes again
edge to edge of tubes is 0.5"

Sent from my iPhone

On Mar 5, 2014, at 6:41 PM, "Laura V" <laura@lavatop.com> wrote:

Hi Bob,
I was asking here about lighting a couple of months ago and got
this link from Kees Brandenburg showing his lightbox (maybe he's too
busy moving the list to see this thread) :)
http://polychrome.nl/techlog/simple-and-cheap-uv-unit

As you can see, the bulbs look pretty close together. I ended up
having a similar unit built (which took almost 3 months - I just
picked it up so haven't tried it yet!) I had the electrical part
done at a place specializing in fluorescent lighting and asked them
to put the bulbs as close together as was safe to do so. It's in the
trunk of my car down the street at the moment and it's snowing, so
I'll get back to you as to the exact distance. Mine has 10 bulbs and
the width is smaller than the 24" (60cm) length, so that is a lot
closer than 4 inches apart.

Perhaps someone else can fill us in whether they need to be that
close together, or maybe it's just a matter of the more bulbs the
quicker the exposure.

Best Regards,
Laura

On 3/4/14 9:43 PM, Bob Cornelis wrote:
I am planning on building a UV light box and have a question about
the layout of the bulbs. Upon the recommendation of a friend who
does alt process work I plan on buying these tubes:

http://www.1000bulbs.com/product/2220/F-20T12BL.html

My questions are how far apart should I mount these and how many
do I need to provide good coverage to expose up to 20x24² (though
I¹m not sure I¹d ever go over 16x20). I plan on having them about
4² above the surface of the prints.

Thanks
Bob

----------------------
707.824.8910
http://www.bobcornelis.com
http://bobcornelis.wordpress.com




_______________________________________________
Alt-photo-process-list | altphotolist.org
_______________________________________________
Alt-photo-process-list | altphotolist.org
_______________________________________________
Alt-photo-process-list | altphotolist.org
_______________________________________________
Alt-photo-process-list | altphotolist.org
_______________________________________________
Alt-photo-process-list | altphotolist.org
_______________________________________________
Alt-photo-process-list | altphotolist.org

_______________________________________________
Alt-photo-process-list | altphotolist.org


Re: UV light box

Andy Schmitt
 

WOW...The heat generated by the "slow" unit must be much less than the other one. Not a bad tradeoff for a 10% increase in exposure time.
I probably need to build another box for Peters Valley school of Craft's Photo Department and that would save me some $$$...always a nice thing for an NPO..
Thanks

Regards

Andy Schmitt PPA

Head of The New & Improved Photography Dept,
Peters Valley School of Craft
http://www.petersvalley.org/html/Photography.cfm

-----Original Message-----
From: Alt-photo-process-list [mailto:alt-photo-process-list-bounces@lists.altphotolist.org] On Behalf Of Darkrooms, Department of Art
Sent: Thursday, March 06, 2014 9:28 AM
To: alt-photo-process-list@lists.altphotolist.org
Subject: Re: [Alt-photo] UV light box

Here at the university we have two exposure units. Both use the same bulb
T12 40BL GE bulbs, 48" length. In our "fast unit" the bulbs are 1 inch apart and about 3" from the surface of the print. The "slow" unit has bulbs that are 6" apart and about 8" from the surface of the print. I find that both have even illumination throughout, but the slow unit has exposure length about 10% longer.

I hope that this is helpful! Good luck and happy printing.

Best,
Jennifer M. Gioffre
Teaching Support Specialist

Architecture Art and Planning
Cornell University
120 Tjaden Hall
Ithaca, NY 14853

o: 607-255-4207
f: 607-255-3462
Jmg393@cornell.edu
Darkroommanager@cornell.edu
AAPstore@cornell.edu




On 3/6/14 7:45 AM, "Jorj Bauer" <jorj@jorj.org> wrote:

I think you'll be fine.

I built a 24" square exposure box from 10x GE 22" blacklight enclosures
(it was what was readily available, so I ran with it). The prints sit
about 6" above the bulbs (I flip over my vacuum frame, so it's
upside-down during exposures).

The bulbs are spaced evenly across the box, which means they're a
little over 2" apart. But I wired it so that there are two power
switches, one for bulbs 1,3,5,7,9 and one for 2,4,6,8,10 (so that I can
turn off half the bank if I want to - I didn't know if this would be
overkill in terms of UV source or not).

I ran some tests using half of the bulbs - so, spaced a little over 4"
apart - and saw no problems. I've always used all of the lights since,
though. My average exposure time is around 6 minutes for most kinds of
prints.

The lights are GE model 10186, 15w blacklight T8s.

Hope that helps,
-- Jorj


On Mar 5, 2014, at 10:42 PM, Bob Cornelis <bob@colorfolio.com> wrote:

Thanks, Marek!

I¹m getting the impression my hope of putting the bulbs 4² apart is
very misguided and that they need to actually be quite close to each
other.

Regards
Bob


--------------------------------------
Color Folio
www.colorfolio.com

Become a fan of Color Folio on Facebook

http://www.facebook.com/ColorFolio

2550 Lewis Dr.
Sebastopol, CA 95472
707.824.8910
888.212.7060 toll free






On Mar 5, 2014, at 7:29 PM, Marek Matusz <marekmatusz@hotmail.com>
wrote:

Ok mine home build unit has the tubes 3" from the print this is the
distance from the edge of the tube. Distance between the tubes again
edge to edge of tubes is 0.5"

Sent from my iPhone

On Mar 5, 2014, at 6:41 PM, "Laura V" <laura@lavatop.com> wrote:

Hi Bob,
I was asking here about lighting a couple of months ago and got
this link from Kees Brandenburg showing his lightbox (maybe he's too
busy moving the list to see this thread) :)
http://polychrome.nl/techlog/simple-and-cheap-uv-unit

As you can see, the bulbs look pretty close together. I ended up
having a similar unit built (which took almost 3 months - I just
picked it up so haven't tried it yet!) I had the electrical part
done at a place specializing in fluorescent lighting and asked them
to put the bulbs as close together as was safe to do so. It's in the
trunk of my car down the street at the moment and it's snowing, so
I'll get back to you as to the exact distance. Mine has 10 bulbs and
the width is smaller than the 24" (60cm) length, so that is a lot
closer than 4 inches apart.

Perhaps someone else can fill us in whether they need to be that
close together, or maybe it's just a matter of the more bulbs the
quicker the exposure.

Best Regards,
Laura

On 3/4/14 9:43 PM, Bob Cornelis wrote:
I am planning on building a UV light box and have a question about
the layout of the bulbs. Upon the recommendation of a friend who
does alt process work I plan on buying these tubes:

http://www.1000bulbs.com/product/2220/F-20T12BL.html

My questions are how far apart should I mount these and how many
do I need to provide good coverage to expose up to 20x24² (though
I¹m not sure I¹d ever go over 16x20). I plan on having them about
4² above the surface of the prints.

Thanks
Bob

----------------------
707.824.8910
http://www.bobcornelis.com
http://bobcornelis.wordpress.com




_______________________________________________
Alt-photo-process-list | altphotolist.org
_______________________________________________
Alt-photo-process-list | altphotolist.org
_______________________________________________
Alt-photo-process-list | altphotolist.org
_______________________________________________
Alt-photo-process-list | altphotolist.org
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Re: UV light box

Darkrooms, Department of Art <darkroommanager@...>
 

Here at the university we have two exposure units. Both use the same bulb
T12 40BL GE bulbs, 48" length. In our "fast unit" the bulbs are 1 inch
apart and about 3" from the surface of the print. The "slow" unit has
bulbs that are 6" apart and about 8" from the surface of the print. I
find that both have even illumination throughout, but the slow unit has
exposure length about 10% longer.

I hope that this is helpful! Good luck and happy printing.

Best,
Jennifer M. Gioffre
Teaching Support Specialist

Architecture Art and Planning
Cornell University
120 Tjaden Hall
Ithaca, NY 14853

o: 607-255-4207
f: 607-255-3462
Jmg393@cornell.edu
Darkroommanager@cornell.edu
AAPstore@cornell.edu

On 3/6/14 7:45 AM, "Jorj Bauer" <jorj@jorj.org> wrote:

I think you'll be fine.

I built a 24" square exposure box from 10x GE 22" blacklight enclosures
(it was what was readily available, so I ran with it). The prints sit
about 6" above the bulbs (I flip over my vacuum frame, so it's
upside-down during exposures).

The bulbs are spaced evenly across the box, which means they're a little
over 2" apart. But I wired it so that there are two power switches, one
for bulbs 1,3,5,7,9 and one for 2,4,6,8,10 (so that I can turn off half
the bank if I want to - I didn't know if this would be overkill in terms
of UV source or not).

I ran some tests using half of the bulbs - so, spaced a little over 4"
apart - and saw no problems. I've always used all of the lights since,
though. My average exposure time is around 6 minutes for most kinds of
prints.

The lights are GE model 10186, 15w blacklight T8s.

Hope that helps,
-- Jorj


On Mar 5, 2014, at 10:42 PM, Bob Cornelis <bob@colorfolio.com> wrote:

Thanks, Marek!

I¹m getting the impression my hope of putting the bulbs 4² apart is
very misguided and that they need to actually be quite close to each
other.

Regards
Bob


--------------------------------------
Color Folio
www.colorfolio.com

Become a fan of Color Folio on Facebook

http://www.facebook.com/ColorFolio

2550 Lewis Dr.
Sebastopol, CA 95472
707.824.8910
888.212.7060 toll free






On Mar 5, 2014, at 7:29 PM, Marek Matusz <marekmatusz@hotmail.com>
wrote:

Ok mine home build unit has the tubes 3" from the print this is the
distance from the edge of the tube. Distance between the tubes again
edge to edge of tubes is 0.5"

Sent from my iPhone

On Mar 5, 2014, at 6:41 PM, "Laura V" <laura@lavatop.com> wrote:

Hi Bob,
I was asking here about lighting a couple of months ago and got this
link from Kees Brandenburg showing his lightbox (maybe he's too busy
moving the list to see this thread) :)
http://polychrome.nl/techlog/simple-and-cheap-uv-unit

As you can see, the bulbs look pretty close together. I ended up
having a similar unit built (which took almost 3 months - I just
picked it up so haven't tried it yet!) I had the electrical part done
at a place specializing in fluorescent lighting and asked them to put
the bulbs as close together as was safe to do so. It's in the trunk of
my car down the street at the moment and it's snowing, so I'll get
back to you as to the exact distance. Mine has 10 bulbs and the width
is smaller than the 24" (60cm) length, so that is a lot closer than 4
inches apart.

Perhaps someone else can fill us in whether they need to be that
close together, or maybe it's just a matter of the more bulbs the
quicker the exposure.

Best Regards,
Laura

On 3/4/14 9:43 PM, Bob Cornelis wrote:
I am planning on building a UV light box and have a question about
the layout of the bulbs. Upon the recommendation of a friend who does
alt process work I plan on buying these tubes:

http://www.1000bulbs.com/product/2220/F-20T12BL.html

My questions are how far apart should I mount these and how many do
I need to provide good coverage to expose up to 20x24² (though I¹m
not sure I¹d ever go over 16x20). I plan on having them about 4²
above the surface of the prints.

Thanks
Bob

----------------------
707.824.8910
http://www.bobcornelis.com
http://bobcornelis.wordpress.com




_______________________________________________
Alt-photo-process-list | altphotolist.org
_______________________________________________
Alt-photo-process-list | altphotolist.org
_______________________________________________
Alt-photo-process-list | altphotolist.org
_______________________________________________
Alt-photo-process-list | altphotolist.org
_______________________________________________
Alt-photo-process-list | altphotolist.org


Re: UV light box

Jorj Bauer <jorj@...>
 

I think you'll be fine.

I built a 24" square exposure box from 10x GE 22" blacklight enclosures (it was what was readily available, so I ran with it). The prints sit about 6" above the bulbs (I flip over my vacuum frame, so it's upside-down during exposures).

The bulbs are spaced evenly across the box, which means they're a little over 2" apart. But I wired it so that there are two power switches, one for bulbs 1,3,5,7,9 and one for 2,4,6,8,10 (so that I can turn off half the bank if I want to - I didn't know if this would be overkill in terms of UV source or not).

I ran some tests using half of the bulbs - so, spaced a little over 4" apart - and saw no problems. I've always used all of the lights since, though. My average exposure time is around 6 minutes for most kinds of prints.

The lights are GE model 10186, 15w blacklight T8s.

Hope that helps,
-- Jorj

On Mar 5, 2014, at 10:42 PM, Bob Cornelis <bob@colorfolio.com> wrote:

Thanks, Marek!

I’m getting the impression my hope of putting the bulbs 4” apart is very misguided and that they need to actually be quite close to each other.

Regards
Bob


--------------------------------------
Color Folio
www.colorfolio.com

Become a fan of Color Folio on Facebook

http://www.facebook.com/ColorFolio

2550 Lewis Dr.
Sebastopol, CA 95472
707.824.8910
888.212.7060 toll free






On Mar 5, 2014, at 7:29 PM, Marek Matusz <marekmatusz@hotmail.com> wrote:

Ok mine home build unit has the tubes 3" from the print this is the distance from the edge of the tube. Distance between the tubes again edge to edge of tubes is 0.5"

Sent from my iPhone

On Mar 5, 2014, at 6:41 PM, "Laura V" <laura@lavatop.com> wrote:

Hi Bob,
I was asking here about lighting a couple of months ago and got this link from Kees Brandenburg showing his lightbox (maybe he's too busy moving the list to see this thread) :)
http://polychrome.nl/techlog/simple-and-cheap-uv-unit

As you can see, the bulbs look pretty close together. I ended up having a similar unit built (which took almost 3 months - I just picked it up so haven't tried it yet!) I had the electrical part done at a place specializing in fluorescent lighting and asked them to put the bulbs as close together as was safe to do so. It's in the trunk of my car down the street at the moment and it's snowing, so I'll get back to you as to the exact distance. Mine has 10 bulbs and the width is smaller than the 24" (60cm) length, so that is a lot closer than 4 inches apart.

Perhaps someone else can fill us in whether they need to be that close together, or maybe it's just a matter of the more bulbs the quicker the exposure.

Best Regards,
Laura

On 3/4/14 9:43 PM, Bob Cornelis wrote:
I am planning on building a UV light box and have a question about the layout of the bulbs. Upon the recommendation of a friend who does alt process work I plan on buying these tubes:

http://www.1000bulbs.com/product/2220/F-20T12BL.html

My questions are how far apart should I mount these and how many do I need to provide good coverage to expose up to 20x24” (though I’m not sure I’d ever go over 16x20). I plan on having them about 4” above the surface of the prints.

Thanks
Bob

----------------------
707.824.8910
http://www.bobcornelis.com
http://bobcornelis.wordpress.com




_______________________________________________
Alt-photo-process-list | altphotolist.org
_______________________________________________
Alt-photo-process-list | altphotolist.org
_______________________________________________
Alt-photo-process-list | altphotolist.org
_______________________________________________
Alt-photo-process-list | altphotolist.org


test => please ingnore

Kees Brandenburg <workshops@...>
 

test 01 => please ingnore

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