Rollei Schneider-Kreuznach 47mm f/5.6 Digitar Lens, Copal 0

Lenses designed for infinity lose sharpness and distort when applied to higher magnifications approaching 1:4 (or higher). The Macro Apo-Digitar lenses have been optimized for a ¡:¡ reproduction ration, with excellent performance in the 1:4 to 4:1 range. This allows image quality at or beyond the limit of the performance of current high-resolution chip backs.

Relative Aperture: 4.0. Nominal Focal Length: 80mm. Effective Focal Length: 80.3mm. Nodal Point Separation: -1.8. Back Focal Distance: 64.7. Accessory Thread: M40.5 x 0.5. Front Mount Diameter: 42. Rear Mount Diameter: 31. Overall Length: 42.6. Seating Face to Rear Edge of Mount: 14.3. Mounting Thread: M32.5 x 0.5. Flange Focal Distance: 78.5. Smallest Aperture: 32. Weight: 215 g.