Schneider SA 90mm XL removable rear flange? Serial Numbers ->

[Phil Hudson]

And mine showing the same.....

[StoneNYC]

Here are some pics - the 90 SAXL with flange installed, flange removed, and back view of the rear cell. The flange feature can be spotted by the gap on the back side of the rear cell (arrow).

And mine showing the same.....

Thanks guys, that's perfect! Very interesting too, I wonder if the removal of the flange gives a little bit extra coverage? Obviously it probably wouldn't be up to Schneider standards, but still could be interesting to see how the removal affects the IC.

Thanks.

[ic-racer]

The flange protects the rear element in case you set it down on the rear cell. It has no optical function. Other lenses have this feature, for example the Topcor LF 90/5.6 needs to have the flange removed to fit through the front standard of the Horseman FA. In fact just last month I was in a panic because I could not find my flange. Found it attached to the rear lenscap in the bottom of a drawer. It is a good idea to put the flange back when dismounting the lens, as the lenscap could also damage the protruding rear element.

This picture shows the rear cell of the two different versions of the Topcor/Horseman/Caltar 90/5.6. The rear-cell on the right has the non-removable flange and the rear-cell on the left has the removable flange.

[StoneNYC]

The flange protects the rear element in case you set it down on the rear cell. It has no optical function. Other lenses have this feature, for example the Topcor LF 90/5.6 needs to have the flange removed to fit through the front standard of the Horseman FA. In fact just last month I was in a panic because I could not find my flange. Found it attached to the rear lenscap in the bottom of a drawer. It is a good idea to put the flange back when dismounting the lens, as the lenscap could also damage the protruding rear element.

This picture shows the rear cell of the two different versions of the Topcor/Horseman/Caltar 90/5.6. The rear-cell on the right has the non-removable flange and the rear-cell on the left has the removable flange.

Fascinating, I've avoided all that extra work by not buying any lenses that don't fit in a Technika board altogether haha.

Even the 150 SS XL I chose over the 150 Nikkor SW because of the size of the rear element not the image quality (which is more even with the Nikon), this is also a rule shoot 77mm or smaller filters, since that's what I standardized on years ago. Luckily the 150 SS XL also had a small rear filter thread, lucky me!

Anyway this is all fascinating, good to know they thought of this so it was still an option (even if an afterthought in some cases) for Technika users.

[Zndrson]

Does anything need to be loosened before removing the rear flange? Does it simply unscrew? The one on my 90XL appears to be very stiff, though it certainly is new enough to have the feature.

[Arne Croell]

Does anything need to be loosened before removing the rear flange? Does it simply unscrew? The one on my 90XL appears to be very stiff, though it certainly is new enough to have the feature.

It just unscrews. Similar to filters, it helps if the force is applied evenly without distorting the ring. Try one of those rubber pads for opening cans, put it flat on a table, press the rim onto it and turn.

[Zndrson]

Thanks for the reply. Used a rubber band and it came right off. Much more tempted to keep it now.

[ic-racer]

Fascinating, I've avoided all that extra work by not buying any lenses that don't fit in a Technika board altogether haha.

The issue is not the Technika or Horseman board, it is the size of the hole in the front standard on the camera. Sure you can mount the rear cell by removing the back of the camera, but what a pain, especially if you have shims.
So unless you have a Technika or Horseman camera you can ignore the removable flange feature (unless you see a lens for sale with an exposed, protruding rear element. Now you know what is missing).

[StoneNYC]

The issue is not the Technika or Horseman board, it is the size of the hole in the front standard on the camera. Sure you can mount the rear cell by removing the back of the camera, but what a pain, especially if you have shims.
So unless you have a Technika or Horseman camera you can ignore the removable flange feature (unless you see a lens for sale with an exposed, protruding rear element. Now you know what is missing).

Yes, sorry, I should have said any lens that doesn't fit in the hole of the Technika device the board goes into... From my limited experience with the two cameras that I have used both with Technika boards, they both have the hole limitation, I assume because of the design of the board, all standards that except the Teknika board would also have the same hole size as recessed boards need to go in them in the light trap has to go around the circle, so any lens in a Technika board would from my experience and understanding need to fit the hole to work, hence my statement, the logical inference is that all lenses on tecnika boards need to fit in that hole to be useable... So all lenses I own have to "fit Technika boards" or I won't buy them as I only use Technika board for all my cameras and all my field work.

If I ever do studio portraits or wet plate that will obviously change but then I'll be using a different camera and probably not such a wide angle lens...