Schneider Xenotar 100mm f/2.8

Schneider Xenotar 100mm f/2.8 is the fast f/2.8 normal lens for medium-format LF cameras — covering 6×7 format only (image circle ~117mm). Like the 80 Xenotar, this lens is medium-format-only despite Copal 0 mounting that suggests LF compatibility.

Key features

• Mount: Copal 0 shutter (1s to 1/500, X-sync at all speeds)
• Focal length: 100mm
• Maximum aperture: f/2.8
• Image circle: ~117mm at f/22 — covers 6×7 medium format; does not cover 4×5
• Optical formula: 5-element/4-group double-Gauss
• Single-coated on older production; multi-coated on later

Use case + rendering

The 100 Xenotar is NOT a 4×5 lens. Use cases on view cameras include 6×7 or 6×9 roll-film backs. The fast f/2.8 aperture provides bright ground-glass focusing — invaluable in dim conditions where typical LF f/5.6 lenses are challenging to focus.

For cameras with 6×7 capability and a need for fast-aperture portrait or low-light work, the 100 Xenotar is among the most-suitable options.

Compatible cameras

• 4×5 cameras with 6×6 or 6×7 roll-film backs only — does not cover full 4×5
• Medium-format roll-film LF setups

Related lenses

• Schneider Xenotar 80mm f/2.8 — wider Xenotar sibling (6×6 coverage)
• Schneider Xenar 100mm f/3.5 — slower budget alternative