Schneider's enlarger lens — 75mm for darkroom printing, not camera use.
The Schneider Componar-C 75mm f/4 is an enlarger lens for darkroom photographic printing — designed for projecting 35mm negatives onto photographic paper. Not a camera lens — purely for darkroom enlargement work.
Optically designed for flat-field projection at close enlargement distances — optimised for magnifying flat negatives onto flat paper. The Componar-C is Schneider's economy enlarger line — below the Componon and Componon-S.
Enlarger lens barrel mount for enlarger lensboards. Not a camera lens. Manual aperture. 39mm thread for enlarger mounting. Designed for 35mm negative enlargement. Schneider's economy darkroom line.
Available used for almost nothing. Enlarger lenses have minimal market value — digital printing replaced darkrooms. The Componar-C is the economy tier — the Componon-S is the quality standard. For darkroom enthusiasts only.