Diameter of Schneider Digitar helical mount, 47mm

[bglick]

Does anyone know the diameter of the Schneider helical mount that will fit the Digitar 47mm fl lens? I am hoping it's not much wider than the copal 0 shutter? No reference on the Schneider site for this specification.
TYIA

[Bob Salomon]

Rodenstock helicals for 0 shutters fit a 3 size hole. Schneider's should not be any different.

[bglick]

Fit a 3 size hole? Maybe my question was not clear.....
I am trying to mount two digitars, side by side, (stereo) both with helical mounts, I want the lens centers to be 66mm apart, in which case, the max. diameter of the helical focus mount can not exceed 65mm.

In the event I use the Rodenstock 60mm digitals, what is the max. diameter of their helical mounts?

TYIA

[Bob Salomon]

Bill, all of the Rodenstock helicals fit a 3 size hole. Their diameters are larger then a 3 size hole.

[Oren Grad]

Bill, the diameter of the hole required for a Copal 3 is 65mm. It sounds as though this isn't going to work for you.

[bglick]

Bob S wrote.... Their diameters are larger then a 3 size hole.

I did know this much!

Hopefully, there is someone on this forum who has good knowledge and/or access to the Rodenstock lenses / mounts in question. Oh yeah, Schneider too.....

Thanks Bob.

[bglick]

Oren, thanks for the response.....

If it's going to work, it will be very close. From pictures I have seen, the helical mount is only slightly larger than the diam of the Copal 0 shutter, which measures 61mm, not counting its hardware, which is OK, as I can mount their "empty" areas towards each other. So, I am hoping the helical mount is no more than 4 mm wider than the Copal 0 shutter, or 65mm.

I assume the helical mount for the digitar 47 is the same one used for the Super Angulon 47, right? TYIA.

[JimL]

I have a Schneider mount for a 75mm lens, which requires a mounting hole of 66mm. The maximum diameter is 71mm, which is right at the mounting flange. If all mounts use the same mounting hole size, they'll have approximately this maximum diameter.

Jim

[bglick]

Looks like I am at a dead end..... i.e. to maintain the desired 66mm lens spacing, I could try manual focus 5x7 camera, but with 47mm lenses???.... I doubt any 5x7 can focus at infinity with 47mm lenses. I needed the 5x7 for the 6x17 back insert for dual images....

Any brainstorms? I think Ebony makes a 4x5 that foucusses down to 47 mm without a recess lens board. I can NOT use recess lens board with dual lenses. With this, I may be able to use the Linhof 120 back, a true 120mm long. But their cameras take Linhof - type boards? I assume this is Linhof field boards? I doubt two 47mm digitars will fit on the board, and be able to insert the board into the camera? Arggggggg........

[Oren Grad]

You might call Peter Gowland and see whether he can built you a custom 5x7 architectural-type camera with a really thin box and a lens panel wide enough to accept two drillings.

Or, get a 5x7 back from Gowland, then see if SK Grimes can fabricate a box like that for you.

If you're thinking of using the Canham 6x17 back, you'll need a Graflok-style 5x7 back - maybe he'll be willing to sell you just the back, and you can ask SK Grimes about building the rest of a box camera around it.

Bear in mind that you'll also need some sort of septum inside the camera to keep the stereo images clean and separate on the film.