Instead of a ruler for size comparison, perhaps Walter can post pictures of those knobs alongside an assortment of coins from all around the world? :) Thanks, Barry - N4BUQ

For those of us who are large format photographers as well as engineers many of us stocked up on polaroid 4x5 film because it had many unique qualities. And it was expensive (3-4 dollars sheet) when

Hi, I've been working on getting an MR501 to operate, but once I found that the CRT heater shows infinite resistance, I don't think there is any point in going further. Which is a pity, because I

Didn't Danaher split off Tek and Fluke into a new company some time ago? ST [TekScopes] <TekScopes@...> wrote:

Hello, Danaher 577: approx 1.25mm Danaher 576: approx 1mm Tolerance +- 1mm, measured it with a ruler which was too big to lay on the CRT properly. -- With best regards Tam Hanna --- NEW: Enjoy

Petzval curvature is actually independent of the conjugates. Phosphor emission is narrowband but far from monochromatic. Some form of chromatic aberration correction of the lens will be

Right up until the hand-over in 1999, we had HK$00.01 notes (1 cent) in Hong Kong. They were printed on one side only, because the printing costs exceeded the value of the note. They were not used

The UK still mints several unusual coins which - importantly - can be used in supermarkets. They are quite popular for several reasons: - since they are "coins of the realm", it would be difficult

Besides almost no one uses enlargers anymore ...for that matter almost no one uses scope cameras anymore :-) Dave manuals@... [TekScopes]

I don't think so Chuck. They are optically designed for very close to unity magnification, and hence unity conjugates, and monochrome. If you use them for much higher magnification they will be

Hi, I think Matt Parker summarizes it well :-)  Are Imperial Measurements outdated? | Number Hub with Matt Parker | Head Squeeze | | | | | | | | | | | Are Imperial Measurements outdated? |

Hi Dan! Yes, the FFT program is available. You'll find a link to a zip archive at the end of this message. But the program needs some explanation. The project was only a proof of concept and the

Not so much the scope cameras, but rather the new manufacture poloroid style 4x5 film. Though I do recall seeing a scope camera being used as the basis for one of the "steampunk" projects. I would

Good grief, so just as I want to actually use a scope camera, they've become a hipster fashion accessory?

   4x5 film is relatively easy to get, its Polaroid film that is impossible. It was discontinued years ago. I don't remember the C-12 well but the photos of it I found on the web show it to have a

For so many years they were at throw away prices, film was obsolete, and unavailable, and most got thrown away. Now those that remain are rather rare. The art photography world has again shown

The part I like is that when dimes, quarters, half dollars, and dollar coins were silver, they all had a weight proportional to their value so they could simply be weighed instead of counted. This

I've seen them retro-fitted with a small USB camera. How well that would work for looking at a fast single sweep, I dunno. The last one I saw (somewhere on the web a couple of years ago) *claimed*

Yeah, and the worst part is it just sold for 200$ apparently.

If the C-12 is for 500 series, then the unit pictured is missing the CRT bezel mount too - I don't see anything there that looks like it could hook to a scope of any kind, actually. The mount is