90/6.8 Angulon Rear Element

[Bob Sawin]

This may be a dumb question but is a rear element necessary? I was given this lens but it does not have a rear element. Is it usable?

[Jon Shiu]

It does need a rear element, but it is very tiny and a bit recessed into the shutter.

Jon

[karl french]

Yes, the lens was designed as a convertible. You can use the front group by itself. Best used behind the aperture. I think it works out to be a 185mm f11 lens by itself.

See:

http://www.cameraeccentric.com/html/...hneider_3.html

[IanG]

Karl, that's an early version of the lens, however the later versions could be used split as well although Schneider soon dropped the recommendation.

Ian

[karl french]

The lens design is the same I believe. I've put 1/2 of my 21cm Angulon on my 8x10 Deardorff just to see what it looked like on the ground glass. Surprisingly sharp.

[Bob Sawin]

Thanks all. As the rear element is recessed maybe I missed it. I'll take another look.

[Toyon]

Sadly, you may never get a good shot with that particular lens model.

[Bob Sawin]

Sadly, you may never get a good shot with that particular lens model.

Toyon,

Would you expand that thought a bit? Why do you think the lens is not a good performer?

[Jon Shiu]

My 1950's model is very soft in the last 1/4" or so in the corners of 4x5 at f16-f22. The 1930's chart indicates about 200mm image circle at f22 and 105 degrees of coverage so I'm not so sure they are the same design.

More recent Schneider data:http://www.schneideroptics.com/info/.../6,8-90mm.html indicates only 154mm of coverage at f16, 81 degrees and 90x120mm recommended format, so not quite enough coverage for 4x5 unless you are exactly centered with no tilts or shifts.

90mm is normally a little wide for my compositions, so I do alright by cropping a little bit.

Jon

[coisasdavida]

I have an entire rear cell here with the original tiny screw-in aluminum cap.
I even placed this add a while ago: http://www.largeformatphotography.in...lon-front-cell
Since then, I have done something else with the shutter.
Drop me a line and we can work something out.