Retaining ring for Wollensak 8x10 Rapid Symmetrical lens

**mdarnton** · 1-Aug-2021, 08:51

It's also nearly impossible that a lens made in the US in 1900 would have anything on it that would have metric measurements, so going at it from that angle is certainly doomed from the start.

**T.Chabry** · 1-Aug-2021, 10:57

Originally Posted by mdarnton

It's also nearly impossible that a lens made in the US in 1900 would have anything on it that would have metric measurements, so going at it from that angle is certainly doomed from the start.

Well, the back section of the lens screws perfectly on the macro tube for my Japanese metric Canon so I had good hopes.

Originally Posted by cowanw

https://www.cameraeccentric.com/stat...llensak_12.pdf
Now you know why a lens sans flange is cheaper than with flange, eh!

Yes, I understand why now. lol

Anyways, the lens is still sitting tight on the board and there is no light leak so I'm not going to woory about it. Thank you all for your help.

**Ron (Netherlands)** · 5-Aug-2021, 13:37

Originally Posted by cowanw

https://www.cameraeccentric.com/stat...llensak_12.pdf
The Automatic shutter is on page 9
....

According to the info on page 15, the OP with his 8x10 lens, has the biggest of the 5 sizes in which the Automatic shutter was made. Someone here might have a comparable shutter and is able to measure the thread pitch.

Originally Posted by cowanw

The pitch of the lens is very important and may well not be standard, .....

The Betax 4 and 5 shutters had the (less common?) pitch of 30 - which can be found as NS thread pitch: https://www.largeformatphotography.i...1&d=1596660474

Btw the title of this thread should ideally also mention the shutter since it bears the thread.

**T.Chabry** · 5-Aug-2021, 17:55

Btw the title of this thread should ideally also mention the shutter since it bears the thread.

Good idea, I added "automatic" in the title, thank you.

**Mark Sawyer** · 5-Aug-2021, 19:18

Originally Posted by T.Chabry

Well, the back section of the lens screws perfectly on the macro tube for my Japanese metric Canon so I had good hopes...

Then you might try getting a step-down ring of that size. Make it a big step and you'll have room to put some screws through it to attach it to the lens board.

**T.Chabry** · 6-Aug-2021, 17:55

The flange I have is already screwed on the lens board and the shutter is screwed half a turn and tight on the flange so I'm not worried about it.
Knowing what is needed would be good if another user has the same problem as me but I think I am all set with my lens setup.