On Thu, 1 Dec 2011 06:59:03 +0000 (UTC), "Geoffrey S. Mendelson"
wrote:

J. Clarke wrote:

They're true interchangeable lenses. Each has a gear on it that meshes
with the focus control. Swapping them out is a bit of a process
http://jsurp.tripod.com/c3lens.htm.

The lenses hav a leica thread on them so you can use them in a standard
ENLARGER. They were not designed, nor do they work on a Leica type camera.

The idea was that compared to a Leica, they were a "poor man's" camera.
You could save a lot of money by using the same lens for the enlarger.

Remember that this was long before the days of Vivtar and Soligar and
Kodak still sold German lenses. :-)

Geoff.

C3 lenses are threaded, but it's not a Leica thread. I just measured
the thread on my Argus C3 Cintar lens to be about 33 mm. The thread
on a screw mount Leica is 39 mm. It is true that most enlarger lenses
have 39 mm threads.

Bud