Schneider's premium APO macro lens — the Componon HM 90mm for high-magnification repro work.
The Schneider APO Componon HM 90mm f/4.5 is Schneider's highest-specification enlarging lens for medium and large format darkroom work. APO indicates apochromatic correction for chromatic aberration, Componon HM (Hard Multi-coating) indicates premium multi-layer coating, and 90mm suits medium format 6x6cm to 6x9cm negative projection.
The lens provides 90mm at f/4.5 maximum aperture with apochromatic optical correction, Schneider's HM hard multi-coating for maximum flare resistance and durability, and a six-element optical formula designed for medium and large format negative projection with exceptional edge-to-edge sharpness.
The APO Componon HM represents the pinnacle of Schneider's enlarging lens range — the combination of apochromatic correction, hard multi-coating, and large negative format coverage produces the highest print quality achievable in optical darkroom printing. Used by museum-quality darkroom printers and professional colour laboratories.
Inspect the HM multi-coating for any abrasion or delamination — the hard coating is durable but long-term storage can affect it. Test aperture blade operation across all stops. Verify mounting thread compatibility with large-format enlarger heads. This lens in excellent condition is highly sought after and valuable among serious darkroom practitioners.