Last Update: Finalized: Work in progress. Steinheil München 135mm f/4.5 Cassarit   Manufacturer: Steinheil München Manufacturer's lens designation on the front ring: Steinheil-Cassarit 4.5/135mm <serial number> Currently manufactured: No Lens type: Manual focus, Prime, Short Telephoto Design: 3 elements in 3 groups Focal length: 135mm Aperture range: f/4.5 – f/32, Preset Manual, 15 blades Focus Range: 1.5m to infinity Sensor format/coverage: 24 mm x 36 mm Mount: M42 x 1 thread**,