Rare Schneider-Kreuznach Isogon 40mm in M42, German distortion-optimised wide-angle with collector appeal.
The Schneider Kreuznach Jsogon 40mm f/4.5 is a German projector lens from Schneider's Jsogon series — designed for slide projectors and used in photography via M42 adaptation. M42 thread mount.
40mm focal length. f/4.5 maximum aperture. Projector/specialty lens design. German manufacture. M42 thread mount.
The Jsogon is a projector lens adaptable to cameras for specialty photography — the flat field design provides distinctive rendering compared to photographic lenses. No focus helicoid; requires extension and bellows for camera use. A niche creative/experimental option.
On the used market the Schneider Jsogon 40mm is a specialty projector lens for adapted use. Condition checks: element cleanliness, aperture blades. M42 thread mount.