The Leica APO Summicron-M 50mm f/2 ASPH lens is currently in stock at Amazon (update: the lens is now sold out).
Leica APO-Summicron-M 50 mm f/2 ASPH specifications:
| Technical data | LEICA APO-SUMMICRON-M 50 mm f/2 ASPH. |
| Angle of view in °(diagonal, horizontal, vertical): | 47° / 40° / 27° |
| Dimensions(Ø . L from bayonet flange): | 53 . 47mm (2.09 x 1.85 in) |
| Weight: | 300g (10.58 oz) |
| Closest focusing distance(from the sensor/film plane): | 0.7cm |
| Smallest object field: | 217 . 407mm |
| Number of iris blades: | 11 |
| Number of lenses (elements/groups): | 8/5 |
| Aspherical surfacesPosition of front lens (from the bayonet): | 24.4 mm |
| Focusing | |
| Focusing range: | 0.7 m to infinity |
| Scales: | Combined, feet/meters |
| Largest reproduction ratio: | 1:11.3 |
| Apertures | |
| Settings / function: | Preselection with click stops at half stops |
| Smallest aperture: | 16 |
| Bayonet: | Leica M quick-change bayonet |
| Filter mount: | Inner-threaded for screw-in filters |
| Filter thread size (Ø in mm): | E39 |
| Lens hood: | Integrated, extendable |
