I can not post?

[optikhit]

I find this FED collapsible lens with a weird series of numbers as the aperture numbers, 3.5, 4.5, 6.3, 9, 12.5, 18. Any body know this lens? What is the difference with other collapsible lens, say industar 22/50? Can this lens fit my Fed 2d camera?

Thanks a lot.

 

[nzeeman]

i think that an older version of that fed lens, and i think that it probably fits fed2.

 

[Jocko]

I find this FED collapsible lens with a weird series of numbers as the aperture numbers, 3.5, 4.5, 6.3, 9, 12.5, 18. Any body know this lens? What is the difference with other collapsible lens, say industar 22/50? Can this lens fit my Fed 2d camera?

Thanks a lot.

It is indeed an older version of the Industar-10 - an uncoated elmar copy like the very earliest I-22s. Unfortunately it may not be compatible with the FED 2. Lenses with these aperture numbers were issued on FED 1s made from 1934 to c.1948. Once large-scale production recommenced in 1948/49 lenses had the "normal" modern aperture sequence. More importantly, they were produced with a standard Leica-screw.

I believe that earlier lenses generally do not fit later cameras, or - if they do - produce out of focus images; the screws were cut to a slightly different standard. I may be wrong here, but I think that Leitz used a Whitworth 39mm screw as opposed to the DIN screw mistakenly used by the Soviets. But... Best to try a test film!

Best wishes, Ian

 

[optikhit]

Thank you very much Ian. I now understand what kind of lens I need.