A large format lens with a 150mm focal length and a maximum aperture of f/5.6.
The Schneider Apo-Sironar 150mm f/5.6 is an apochromatic large format lens for 4×5" view cameras, part of the Apo-Sironar line developed jointly by Schneider and Rodenstock. Apochromatic correction brings three colour wavelengths to a common focal plane — essential for colour photography and fine-art printing. The 150mm is the standard normal focal length for 4×5" format, equivalent to approximately 50mm on 35mm.
150mm focal length, f/5.6 maximum aperture, apochromatic correction, large format design covering 4×5" with room for movements, mounted in Copal shutter (No.0 or No.1). View camera use only — no camera-body interface.
The Apo-Sironar 150mm f/5.6 is among the most widely used large format lenses for colour work — its apochromatic correction produces accurate colour without lateral chromatic aberration that affects cheaper designs. The Copal shutter enables flash sync at any speed. Compare: Rodenstock Apo-Sironar-S is the premium variant; the standard Apo-Sironar is excellent for most large format applications.
Test Copal shutter speeds for accurate timing. Inspect all glass elements for haze and cleaning marks. Check aperture blade condition. Verify lens board hole size compatibility (Copal No.0 = 34.7mm, No.1 = 41.6mm). Test coverage circle with movements on intended film size. These are high-value large format optics — handle with care.