Rodenstock Apo-Sironar-S 300mm f/9

Rodenstock Apo-Sironar-S 300mm f/9 is the slow Apo-Sironar-S telephoto variant at 300mm — slower aperture (f/9 vs f/5.6) for compactness. Despite the f/9, this is the high-MTF refined Apo-Sironar-S formula, not a process lens like Apo-Ronar.

Key features

• Mount: Copal 3 shutter (1s to 1/125, X-sync at all speeds)
• Focal length: 300mm
• Maximum aperture: f/9
• Image circle: ~410mm at f/22 — covers 8×10 with movements
• Optical formula: Refined apochromatic plasmat with high-MTF optimization (telephoto-formula variant)
• Multi-coating standard

Use case + rendering

The 300/9 Apo-Sironar-S is the field-portable refined 8×10 normal — same high-MTF rendering as f/5.6 sibling at the cost of slower aperture and slightly more compact size. Useful when ground-glass focus brightness is less critical than weight savings.

Compatible cameras

• 8×10 view cameras with Copal 3 lens-board capacity

Related lenses

• Rodenstock Apo-Sironar-S 300mm f/5.6 — brighter sibling
• Rodenstock Apo-Ronar 300mm f/9 — process-lens alternative at same aperture