Angulon question

[John NYC]

I just bought a Schneider 90mm f/6.8 Angulon (to use with Ben's upcoming camera) and there is a little screw -- shown in the box in the picture -- that is not flush and cannot be screwed further in. It prevents the retaining ring from making a flush contact with the back of the lens, so there is no way to mount this firmly to a board without a wobble. Anyone know what this screw is and how to resolve this issue?

John

[Bob Salomon]

Just remove it.

[John NYC]

Just remove it.

Thanks, it comes out and it seems to serve no function. What is the screw for?

[Ben Syverson]

It's a "set screw" for positioning on a lens board. We're actually building in a recess for the set screw... But I always remove them anyway because they interfere with my other lens boards, none of which have holes for set screws.

[John NYC]

It's a "set screw" for positioning on a lens board. We're actually building in a recess for the set screw... But I always remove them anyway because they interfere with my other lens boards, none of which have holes for set screws.

Thanks, Ben! All mounted now.

After the sun gets pretty tonight, I am going up on my roof to shoot the Angulon on 8x10 (just to see the effect) and 4x5 as a test.

[Ben Syverson]

Ha! Should be interesting on 8x10! These older wides don't mechanically vignette, so even though the Angulon doesn't have much useful coverage, you should see an image circle bigger than 4x5.

[Ole Tjugen]

Depending on the age of the lens, the image circle will be between 160mm and 200mm. Circle of illumination, for all ages of Angulon 90mm, will be around 220mm.

http://www.bruraholo.no/Cameras/Angulon/index.html

[John NYC]

Depending on the age of the lens, the image circle will be between 160mm and 200mm. Circle of illumination, for all ages of Angulon 90mm, will be around 220mm.

http://www.bruraholo.no/Cameras/Angulon/index.html

From my serial number, mine appears to be from ~1962.

[Ole Tjugen]

From my serial number, mine appears to be from ~1962.

Good late one then. Image circle is adequate for 4x5" at f:16 (although some would say F:32), and doesn't really increase after that . Old pre-WWII ones can be used with 5x7" at very small stops, as long as you're not too finicky about corner sharpness.

[SMBooth]

File a slot in the lens board and let the screw do its job, that is to stop the lens rotating when you screw everything together.

[Kirk Gittings]

File a slot in the lens board and let the screw do its job, that is to stop the lens rotating when you screw everything together.

muy ditto

[John NYC]

And here is my test shot. Lens is very sharp, and even the corners look good. It was interesting to overlay the same shot on 8x10 (I used my reducing back on my Wehman to first make the 4x5, then an 8x10). The area of illumination does extend past the 4x5 frame but after about 5mm beyond it would not be sharp enough. So only wiggle room on this for movements. No worries as this will be used on the Wanderlust.

70169

[Ben Syverson]

Nice! It's a great little lens, isn't it?