A 150mm f/5.6 enlarging lens from Schneider's Comparon series.
The Schneider Comparon 150mm f/5.6 is an enlarger lens designed for darkroom printing from medium-to-large format negatives. The Comparon is Schneider's economy-tier enlarger lens line — functional for standard printing, below the Componon-S in optical correction quality. The 150mm focal length is appropriate for printing from 5×7" or 8×10" negatives at standard magnifications.
150mm focal length, f/5.6 maximum aperture, flat-field corrected for enlarger use, standard enlarger thread mount (M39), manual iris for exposure control, no camera-body interface.
The Comparon 150mm f/5.6 is optimised for the enlargement ratios typical of larger format negatives — the longer focal length ensures coverage of the full negative area without corner vignetting. Compared to the Componon-S, the Comparon offers adequate performance for standard prints but not extreme resolution for large-print fine art work. In modern use, Comparon lenses are adapted for macro photography via bellows.
Inspect all glass elements for haze, fungus, or cleaning marks — enlarger lenses often see decades of darkroom use. Check iris blades for oil contamination. Verify the aperture ring operates smoothly through all stops. Test with an enlarger or bellows to confirm flat-field performance.