Rare Schneider-Kreuznach Isogon 40mm in M42, German distortion-optimised wide-angle with collector appeal.
The Schneider-Kreuznach Isogon 40mm f/4.5 is a rare wide-angle lens in M42 mount from the renowned German optical manufacturer known for professional large format and cinema optics. The Isogon name indicates an equal-angle design optimised for minimal distortion across the wide-angle field of view.
The Schneider-Kreuznach heritage ensures quality German optics, and the Isogon design prioritises minimal distortion — valuable for architectural and documentary photography where straight lines must remain straight. The 40mm provides a useful slightly-wide standard perspective.
Build quality is quality Schneider with all-metal construction and the precision expected of German professional optics manufacturers. The M42 mount provides universal adaptability to modern mirrorless cameras via inexpensive adapters.
The Schneider Isogon 40mm f/4.5 is a rare collector piece on the used market, interesting for its Schneider-Kreuznach heritage and distortion-optimised design. The German optical pedigree provides quality above typical M42 alternatives.