Date   
Re: First Light for the Evostar 150

Michael Morris
 

Thanks Andrew
A great observing report. Sounds like a nice piece of kit you've got yourself. Great picture too. :-)

--- In worcesteras@..., "Andrew Buckland" <bucklamp@...> wrote:


12/14th February 2011

After several months of thinking about it I obtained a Skywatcher
Evostar 150 refractor from Chris last week.

One thing that strikes you about a relatively slow, F8, six inch
refractor is its sheer size. Ok, the tube is only about 6 inches in
diameter but with the dew shield fitted it is about 5 foot long.

I did all of the usual alignment of finder and working out the balance
points for the EQ5 mount inside during the week and was keen to actually
see this beast in action.

As Saturday afternoon turned into evening the skies cleared and I
hurriedly set up and turned the 'scope to the moon. Note to self, will
need to extend the legs of the EQ5 mount since the eyepiece was little
more than 18 inches above the ground. However, through rapidly
deteriorating seeing I was already pleased with the image that the
system was delivering. The straight wall (Rupes Recta) was pin sharp in
the eyepiece at 40x magnification. I did manage to take a
"snap" of the complete lunar disk with the DSLR, I will post
this to pictures section in due course. It is amazing to think that it
is possible to capture the moon in 1/4000th of a second. Sadly for me
that was about all I had chance to see before I had to call it a night.

Tuesday, was a bit better. With the chance of an observing session I set
up the scope before dinner allowing it to cool down for a good hour or
so before using it in anger. Seeing was average and there was only a
small amount of high level cloud. Again the moon presented itself in
the window of opportunity that I have from my garden. Though this was
just a shake down observing session I managed to capture some acceptable
videos of the lunar surface. The magnification and light grasp of this
telescope is an improvement over the Celestron 102 and consequently I
could turn down the gain a bit more on the SPC900NC webcam.

I will post a composite image of the Copernicus / Sinus Iridum area of
the moon in the pictures section of the news group.

With the high cloud becoming more of a problem I turned the scope to
Castor and easily split this double at 120x and had a good view of the
Mizar/Alcor grouping at 40x.

So ended my first real session with the Evostar 150. It is (slightly)
easier to handle than the Explorer 200. It is lighter and less bulky but
it is longer and hence the chance of accidentally knocking it is higher.
There is some Chromatic Aberration as can be seen in the Copernicus shot
but this can be calmed with the use of the Baader Semi Apo filter I have
(but forgot to use on that occasion). I have long thought about having
a high F number large refractor and now I have one and I am not
disappointed.

Clear skies

Andrew

First Light for the Evostar 150

Andrew Buckland
 

12/14th February 2011

After several months of thinking about it I obtained a Skywatcher Evostar 150 refractor from Chris last week.

One thing that strikes you about a relatively slow, F8, six inch refractor is its sheer size. Ok, the tube is only about 6 inches in diameter but with the dew shield fitted it is about 5 foot long.

I did all of the usual alignment of finder and working out the balance points for the EQ5 mount inside during the week and was keen to actually see this beast in action.

As Saturday afternoon turned into evening the skies cleared and I hurriedly set up and turned the 'scope to the moon. Note to self, will need to extend the legs of the EQ5 mount since the eyepiece was little more than 18 inches above the ground. However, through rapidly deteriorating seeing I was already pleased with the image that the system was delivering. The straight wall (Rupes Recta) was pin sharp in the eyepiece at 40x magnification. I did manage to take a "snap" of the complete lunar disk with the DSLR, I will post this to pictures section in due course. It is amazing to think that it is possible to capture the moon in 1/4000th of a second. Sadly for me that was about all I had chance to see before I had to call it a night.

Tuesday, was a bit better. With the chance of an observing session I set up the scope before dinner allowing it to cool down for a good hour or so before using it in anger. Seeing was average and there was only a small amount of high level cloud. Again the moon presented itself in the window of opportunity that I have from my garden. Though this was just a shake down observing session I managed to capture some acceptable videos of the lunar surface. The magnification and light grasp of this telescope is an improvement over the Celestron 102 and consequently I could turn down the gain a bit more on the SPC900NC webcam.

I will post a composite image of the Copernicus / Sinus Iridum area of the moon in the pictures section of the news group.

With the high cloud becoming more of a problem I turned the scope to Castor and easily split this double at 120x and had a good view of the Mizar/Alcor grouping at 40x.

So ended my first real session with the Evostar 150. It is (slightly) easier to handle than the Explorer 200. It is lighter and less bulky but it is longer and hence the chance of accidentally knocking it is higher. There is some Chromatic Aberration as can be seen in the Copernicus shot but this can be calmed with the use of the Baader Semi Apo filter I have (but forgot to use on that occasion). I have long thought about having a high F number large refractor and now I have one and I am not disappointed.

Clear skies

Andrew

Re: Posting video files - an answer.

Michael Morris
 

I've added a link to a video I took of the occultation of Saturn in May 2007 to show how this works. Look in the 'Links' section of the newsgroup.

--- In worcesteras@..., "michaelcharlesmorris" <michaelmorris4@...> wrote:

At the February meeting at Lower Smite Farm we had a query about posting video files on the newsgroup. If the society is to host video files they would have to posted in the 'Files' section of the newsgroup. I'm afraid we only have 100MB of space allocated to us for this section of the newsgroup which is nothing like enough space to host video files. The photos section (which has 100GB of space) will not accept videos.
The answer therefore is for members to post any video files they want to display on Youtube, and then send us a link to the Youtube video.

Posting video files - an answer.

Michael Morris
 

At the February meeting at Lower Smite Farm we had a query about posting video files on the newsgroup. If the society is to host video files they would have to posted in the 'Files' section of the newsgroup. I'm afraid we only have 100MB of space allocated to us for this section of the newsgroup which is nothing like enough space to host video files. The photos section (which has 100GB of space) will not accept videos.
The answer therefore is for members to post any video files they want to display on Youtube, and then send us a link to the Youtube video.

WELCOME

Michael Morris
 

WELCOME to the new Worcester Astronomical Society Newsgroup. This newsgroup is open to all members of Worcester Astronomical Society.

The newsgroup is designed to compliment the society's website, which can be found at http://worcesteras.freeserve.co.uk. It allows members to find out about breaking news, such as whether observing evenings are going ahead; post observing reports, scanned sketches and digital images; download copies of presentations and supporting materials that is available for some talks; post links to interesting websites; and chat to other members on line.

How do I join the Worcester Astronomical Society newsgroup?
Applying for membership is easy, free and should only take about 2 minutes. However, you will need to create a Yahoo! account if you don't already have one. Your membership will have to be approved on line by one of the moderators (a committee member) before you can access the members-only features. We hope to approve membership requests within a day or two, but it will probably be done much quicker. You can find out how to apply for membership at http://help.yahoo.com/l/us/yahoo/groups/original/members/index.html

Do I have to be a member of the newsgroup to read it?
No, anyone can read the postings on the newsgroup. However, you'll need to be a member to post on it or to access the files, photos or links.

How do I post a comment or question?
Once you're logged in to Yahoo!, go to the worcesteras newsgroup and click on Messages > Post on the left hand side. If you're new to the newsgroup, your first few postings will be cleared through the moderators before they appear on the newsgroup.

How to do I post pictures or sketches?
All photos and scanned sketches will be approved by a moderator before they appear on the newsgroup. Please, no family snaps or pretty landscapes - just astro stuff or society events. It's really helpful to other members if you can include details of the object you have imaged, including exposure details and the equipment and processing techniques used. Please read the photograph and sketch posting guidelines before posting any pictures. These guidelines can be found in the `Files' section.

Can I post files, links or calendar entries?
As a member you cannot directly post a file, link or calendar entry. Requests for links, calendar entries and for files to be posted to the `Files' section should be e-mailed to: worcesteras@...

What can I post?
The main stipulation is that you only post things relevant to the society and/or to astronomy. We have come up with a very simple set of posting rules. You can find them in the `Files' section.

How do I know what's been posted on the newsgroup?
If you go to `Edit membership' just above the newsgroup title bar. Scroll down to Step 2 – Message delivery to select how you want to be informed (or not) about postings to the newsgroup. If you just want to receive messages from moderators (For instance, Notification of whether Observing Evenings are going ahead or not), select Special Notices. You can change these settings at any time.

Clear skies

The Moderator Team