Rodenstock APO-Sironar S 135mm f/5.6

Rodenstock Apo-Sironar-S 135mm f/5.6 is the refined high-MTF apochromatic 4×5 plasmat — the "S" denoting Rodenstock's Apo-Sironar successor with optimized MTF for digital scanning and large-print enlargement.

Key features

• Mount: Copal 0 shutter (1s to 1/500, X-sync at all speeds)
• Focal length: 135mm
• Maximum aperture: f/5.6
• Image circle: ~210mm at f/22 — covers 4×5 with generous movements
• Optical formula: Refined apochromatic plasmat with high-MTF optimization
• Multi-coating standard

Use case + rendering

The 135 Apo-Sironar-S is the high-resolution 4×5 wide-of-normal — sharper at high spatial frequencies than the older Apo-Sironar-N. Visible improvement in fine detail at 30+ inch print sizes from drum-scanned 4×5 negatives.

Compatible cameras

• Toyo 45A / Toyo 45AII / Toyo 45G
• Cambo SC / Cambo Calumet 45NX
• Graflex Crown Graphic / Graflex Speed Graphic / Graflex Super Graphic

Related lenses

• Rodenstock Apo-Sironar-N 135mm f/5.6 — older standard
• Rodenstock Apo-Sironar-S 150mm f/5.6 — true normal sibling
• Schneider Super-Symmar HM 120mm f/5.6 — Schneider HM equivalent