Rodenstock Sironar 240mm f/5.6

Rodenstock Sironar 240mm f/5.6 is the classic Rodenstock 5×7 + 8×10 normal-class plasmat — original Sironar at 240mm.

Key features

• Mount: Copal 1 shutter (1s to 1/400, X-sync at all speeds)
• Focal length: 240mm
• Maximum aperture: f/5.6
• Image circle: ~330mm at f/22 — covers 5×7 with generous movements; covers 8×10 tightly
• Optical formula: 6-element/4-group plasmat
• Single-coated older; multi-coated later

Use case + rendering

The 240 Sironar serves as portrait lens for 4×5, short-tele for 5×7, and normal for 8×10. Long-running production; widely available.

Compatible cameras

• Toyo 45A / Toyo 45AII / Toyo 45G
• Cambo SC / Cambo Calumet 45NX
• 5×7 + 8×10 view cameras

Related lenses

• Rodenstock Sironar 210mm f/5.6 — wider Sironar
• Rodenstock Sironar 300mm f/5.6 — longer Sironar
• Rodenstock Apo-Sironar-N 240mm f/5.6 — apochromatic successor