75 Zeiss Biogon mil. surplus barrel lens - sketch for mounting into Copal 1 shutter

[John Schneider]

I had a military-surplus 75mm Zeiss Biogon barrel lens that I wanted to mount into a shutter. I borrowed a converted lens and made the attached sketches in case anybody wants to do this. After having the machining done, I can confirm that everything fits as it should.

[Boscoe]

Would you post some pictures of it finished?

[ruilourosa]

A man called schneider should never use Carl Zeiss!

[pierre506]

A man called schneider should never use Carl Zeiss!
[emoji1] [emoji2] [emoji3] [emoji4] [emoji6]

[Jac@stafford.net]

Very interesting. Thank you.

A very minor contribution: with my similar conversion of a physically larger 3" Biogon (covers 5x5"), there is a spacer in front of the shutter which allowed final fine machining to suit lens spacing. You can barely see it in the photo.

121944

[John Schneider]

A very minor contribution: with my similar conversion of a physically larger 3" Biogon (covers 5x5"), there is a spacer in front of the shutter which allowed final fine machining to suit lens spacing. You can barely see it in the photo.

Very nice to see! I used to have two of these lenses (from KS-87B aerial cameras; mine were by Pacific Optical) but could never figure out how to easily mount it into a shutter.


Would you post some pictures of it finished?

Regarding the conversion of the Zeiss 75mm lens (from the KS-71 aerial camera), here are some pics. The rear barrel (R) is machined to mate to a Copal 1 shutter, and the front barrel (L) uses the adapter to mate to the shutter. The tape on the front glass is to protect it while I have a custom lenscap made.

[John Schneider]

More details. Left pic: the front element is on the left, rear barrel to the right, with the adapter for the front barrel in between.
..................Center pic: detail of the rear barrel after machining to mate to a Copal shutter.
..................Right pic: detail of front barrel (not modified for the conversion), and showing interior of adapter for front barrel.

[Jac@stafford.net]

The rear barrel (R) is machined to mate to a Copal 1 shutter

That is very cool. The #5 shutter I use has become unreliable. In fact, I now have two broken #5s. :(

[Blackmarxz]

What kind of picture quality do you get from this John? Cheers

[Jason Greenberg Motamedi]

I’ve been trying something similar, albeit in plastic: 3-D printing an adapter for 3” Goerz Hycon cells, which I picked up unused 15 years ago. This is my first version for a #3 shutter. I’d rather do it in metal, but I am making do with what I have.

https://uploads.tapatalk-cdn.com/20200516/534772b4bff1c563af9af8dc7a17044d.jpg

https://uploads.tapatalk-cdn.com/20200516/0ece0f6bb3dd542e95773b0806edb29d.jpg

[John Layton]

oh...that tape directly on the front lens element - ok on older coating? Painters tape, yes good...but I might have laid down a circle of lens tissue first, just sayin'.