Rodenstock Sironar 135mm f/5.6

Rodenstock Sironar 135mm f/5.6 is the classic Rodenstock LF plasmat at slightly-wide-of-normal — the original Sironar predecessor to Sironar-N and Apo-Sironar-N at the same focal length. In production from the 1950s.

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: ~190mm at f/22 — covers 4×5 with movements
• Optical formula: 6-element/4-group plasmat
• Single-coated on older production; multi-coated on later

Use case + rendering

The 135 Sironar is the older Rodenstock 4×5 wide-of-normal — predecessor to Apo-Sironar-N 135. Sharp by f/22; older single-coated examples have lower contrast vs modern multi-coated equivalents but adequate for B&W and routine color.

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 Sironar 150mm f/5.6 — true normal Sironar sibling
• Rodenstock Apo-Sironar-N 135mm f/5.6 — apochromatic successor
• Rodenstock Apo-Sironar-S 135mm f/5.6 — refined apochromatic