Schneider-Kreuznach APO-Componon HM 90mm f/4.5 professional enlarging lens mounted in a rare Salthill precision focusing lens stage.
The APO-Componon HM was Schneider’s premium apochromatic enlarging-lens series and is particularly well regarded for medium-format enlarging, reproduction and high-resolution copy work.
The Salthill mount is the unusual part of this setup. Salthill Photographic Instruments produced extremely high-quality professional darkroom equipment in relatively small numbers. This large precision focusing stage provides exceptionally smooth, fine axial focusing through its oversized knurled helical mechanism, with a separate focus lock.
Surviving documentation from an original Salthill enlarger owner confirms that Salthill systems were supplied with interchangeable lens stages carrying Schneider APO-Componon HM lenses, including this 90mm focal length.
Used condition with normal cosmetic wear and dust from darkroom storage. Glass appears good visually; please examine photographs for condition.
A particularly nice piece for a serious traditional darkroom, Salthill collector, or someone adapting high-quality enlarging optics for precision reproduction work.