Bernice Loui
8-Nov-2020, 10:46
From a previous discussion,
https://www.largeformatphotography.info/forum/showthread.php?160785-(possibly)-taking-the-large-jump&p=1574844#post1574844
Daniel Unkefer asked about how this Schneider 500mm f 5.5 Tele Xenar was mounted to the Sinar lens board.
Mounting to the Sinar lens board was done with an aluminum collar threaded to fit the lens barrel with a recess step and threaded flange
on the lens board end to assure no possible way for light leaks. The aluminum collar began as a 6061 aluminum 4.5" OD_3.5" ID tubular extrusion (common at the metal suppliers). Set up on the lathe, then worked on as needed. At some point, it will be painted black inside with the exterior polished aluminum to match the finish of the Tele Xenar.
Side view.
209344
Top view,
209345
Back view,
209346
Comparison to a Goerz 19" f11 APO artar (Red Dot) which is the normally used tele on 5x7.
The 500mm f5.5 Tele Xenar is larger, heavier and .. might weight as much as a lightweight 4x5 folder camera.
209351
Optically, the Tele Xenar is absolutely usable at f5.5 full aperture, improves one stop down at f8, by f11 is about as good as it will get.
Plenty "sharp" with lower contrast similar to other Schneider Xenar lenses.
These are more common in a Compound# 5 shutter. Most were sold for Linhof 5x7_13x18cm Technika. Some have made remarkable adaptors
to fit this on to a Linhof 4x5 Technika and .... On the Sinar Norma with Sinar shutter, there are no stability or other issues. Lens simply works on the Norma or other Sinar front standard with the Sinar shutter.
Your Sunday lens curiosity,
Bernice
https://www.largeformatphotography.info/forum/showthread.php?160785-(possibly)-taking-the-large-jump&p=1574844#post1574844
Daniel Unkefer asked about how this Schneider 500mm f 5.5 Tele Xenar was mounted to the Sinar lens board.
Mounting to the Sinar lens board was done with an aluminum collar threaded to fit the lens barrel with a recess step and threaded flange
on the lens board end to assure no possible way for light leaks. The aluminum collar began as a 6061 aluminum 4.5" OD_3.5" ID tubular extrusion (common at the metal suppliers). Set up on the lathe, then worked on as needed. At some point, it will be painted black inside with the exterior polished aluminum to match the finish of the Tele Xenar.
Side view.
209344
Top view,
209345
Back view,
209346
Comparison to a Goerz 19" f11 APO artar (Red Dot) which is the normally used tele on 5x7.
The 500mm f5.5 Tele Xenar is larger, heavier and .. might weight as much as a lightweight 4x5 folder camera.
209351
Optically, the Tele Xenar is absolutely usable at f5.5 full aperture, improves one stop down at f8, by f11 is about as good as it will get.
Plenty "sharp" with lower contrast similar to other Schneider Xenar lenses.
These are more common in a Compound# 5 shutter. Most were sold for Linhof 5x7_13x18cm Technika. Some have made remarkable adaptors
to fit this on to a Linhof 4x5 Technika and .... On the Sinar Norma with Sinar shutter, there are no stability or other issues. Lens simply works on the Norma or other Sinar front standard with the Sinar shutter.
Your Sunday lens curiosity,
Bernice