Mounting Schneider 90mm Super-Angulon

mikewhi · Sep 27, 2005

Hi:

My friend has one of these lenses in a Synchro Compur shutter. We mount it to a metal lensboard and when we tighten the retaining rigng down, the aperture adustment lever on the lens binds against the front of the lensboard and cannot hardly be turned - a big problem in the field. The front of the lensboard is flat metal. It looks like there should be a spacer of some sort but I dont' see how one would be installed.

I'm sure with such a common lens, that someone has mounted these before. Can anyone tell me how you keep the aperture lever from binding against the front of the lensboard?

Thank you very much.

-Mike Whiting

L Gebhardt · Sep 27, 2005

What size shutter does this one have? If it is a 00 then you may need to get a lensboard with a smaller hole.

Donald Miller · Sep 27, 2005

I have a couple of lenses that are mounted in compurs. I have one mounted on a wooden board and it has a very small screw protruding from the inner ring (inside the aperture ring) and that seems to provide the offset that is required. The other lens I have is not mounted in a board yet and it seems to be configured the same way. Could your friend possibly be overtightening the retaining ring?

The other thing has already been mentioned...that of the proper size mounting hole in the board.

Dave Parker · Sep 27, 2005

On these little shutters, making sure you have the correct sized mounting hole is very important, also, you might need to stop by the local hardware store and pick up a nylon washer that fits the back of the shutter, which will space the shutter a bit above the board to get the clearance needed to be able to adjust the aperture lever, I have done this on quite a few of my lenses.

Dave

mikewhi · Sep 27, 2005

The lensboard has the correct sized hole in it. It has a single retaining ring on the back and when tightened down sufficiently to hold the lens in place, the aperture adjustment arm rubs against the front of the lensboard. Looking at the threads on the front of the lens, there is a gap at the base of the threads that looks like it is just big enough to hold a small spacer ring that would provide the correct offset and not interfer with the aperture adjustment arm.

If you have one of these lenses, can you tell me if you have a spacer ring of any sort on the front of the lensboard? How do you provide the needed offset?

Looking at the rear of the shutter where the aperture ring is, there are 3 small screws inside the aperture lever. It looks possible that if I back out these screws that they would provide some offset and would prevent the arm from rubbing against the front of the lensboard, but I am not certain that is their purpose. If I loosen them, something might come loose that I don't intend.

It is obvious that the rear of the shtter is not intended to sit flat against the front of the lensboard, there is no way for the aperture lever to move. Can others tell me how theirs is mounted to prevent this.

Thanks.

-Mike

MattCarey · Sep 27, 2005

Mine has a thin shiny metal shim on it. It isn't much, but I guess it is important.

Matt

Jorge · Sep 27, 2005

mikewhi said:
The lensboard has the correct sized hole in it. It has a single retaining ring on the back and when tightened down sufficiently to hold the lens in place, the aperture adjustment arm rubs against the front of the lensboard. Looking at the threads on the front of the lens, there is a gap at the base of the threads that looks like it is just big enough to hold a small spacer ring that would provide the correct offset and not interfer with the aperture adjustment arm.

If you have one of these lenses, can you tell me if you have a spacer ring of any sort on the front of the lensboard? How do you provide the needed offset?

Looking at the rear of the shutter where the aperture ring is, there are 3 small screws inside the aperture lever. It looks possible that if I back out these screws that they would provide some offset and would prevent the arm from rubbing against the front of the lensboard, but I am not certain that is their purpose. If I loosen them, something might come loose that I don't intend.

It is obvious that the rear of the shtter is not intended to sit flat against the front of the lensboard, there is no way for the aperture lever to move. Can others tell me how theirs is mounted to prevent this.

Thanks.

-Mike

My Rodenstock came with a spacer ring precisely for the same purpose. I tried mounting it without the spacer ring and the aperture lever binded to the lensboard. You should be able to tighten the retaining ring just enough so that the lens does not rotate but the lever is free to move, many of my 4x5 lenses had this problem and it was the only solution I found, other than making a spacer.

mikewhi · Sep 27, 2005

Thanks everyone, I am off to the hardware store. If I find no joy there, then I'll place a call to SK Grimes to see if they have or can make a spacer. I did try backing out the 3 screws a tiny bit and that did solve the provlem, but I will go for a spacer as a permanent solution.

Thanks!

-Mike

MattCarey · Sep 27, 2005

You know--you can probably just use some black construction paper.

Matt

Ole · Sep 27, 2005

Some of my lenses have very thin shims between the shutter and the lensboard, and a few more lenses should have had them...

Buster6X6 · Sep 27, 2005

Hi Mike
You can also buy a brass shim stock of different thicknesses 5 thou. 10 thou. and so on.Using a protractor make to concentric circle's cut them out with scissors. You can also stack them up as you need. Hope this is of some help.

Greg

mikewhi · Sep 28, 2005

Thanks everyone. My Greek friends insisted that I try dental floss first. When that didn't work, they insisted that I use Windex. Finally, I cut a shim out of a plastic washer and that worked perfectly. Thanks for the ideas. Too bad S.K. Grimes lost some business.

-Mike

barryjyoung · Sep 28, 2005

If you would like a more permanent and light proof solution let me know and we can make you a spacer here in Edmonds WA about 9 miles away. It is a very small world.

Barry Young

Mounting Schneider 90mm Super-Angulon

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