Rodenstock's premium 35mm enlarging lens — the Rodagon 50mm f/2.8, same as ID 4405.
The Rodenstock Rodagon 50mm f/2.8 is among the most widely used professional enlarging lenses for 35mm darkroom work, competing directly with the Nikon EL Nikkor 50mm f/2.8 N and Schneider Componon-S 50mm f/2.8 as the gold standard for 35mm printing. Rodenstock's six-element design and multi-coating deliver excellent sharpness and colour neutrality across the 35mm frame.
50mm focal length, f/2.8 maximum aperture, Rodenstock multi-coated six-element design, M39 thread mount.
The Rodagon 50mm f/2.8 is the professional standard for 35mm enlarging. The f/2.8 aperture enables comfortable focusing under the enlarger. Sharpness is optimal at f/5.6. Both the Rodagon and EL Nikkor N are commonly found in professional darkrooms; choice between them is often a matter of availability and price rather than measurable performance.
Inspect all elements for fungus, haze, and coating condition. Aperture blades should be clean and oil-free. Check M39 thread. Stored correctly the Rodagon should show no fungal damage.