Leica 21mm f/3.4 Super-Angulon M – Technical Information
Manufacturer: Schneider-Kreuznach – Leica
Optics: 8 elements in 4 groups
Aperture range: f/3.4 to f/22
Filter: M 48 X 0.75 Thread – or Series 7 (held in place by the hood)
Maximum Outer Diameter: 52.5mm
Weight: about 250g (black version, without caps)
Lens code number: 11103
Lens hood code number: 12501 (12501M)
Front lens cap code number: 14102 (A52.5)
External viewfinder code number: 12002
Leather case for viewfinder code number: 14617
