* Relative aperture 1:2.0 (up to 1:16 with clicks).
* Additional ring for fast closing aperture from full opened to preinstalled meaning.
* Lens mount M42 (known also as Pentax Screw Mount), same with huge quantity of lenses for old Practica, Pentax, Yashica, Cosina and other cameras with optical registration 45.5mm.
* Mounting for modern SLR & dSLR cameras will not bring any trouble with well-spread M42 adapters.
* The lens is well-applicable for digital cameras with micro 4/3 system and other with working distance 45.5mm and less, with the use of adapters:
All Sony NEX, Olympus, Panasonic: Lumix DMC-G1, DMC-GH1, DMC-GF1, DMC-G2, DMC-G10, Epson, Samsung and other.
* Focusing from 0.5m.
* Scale of distances in meters.
* Filter mount M 52.5x0.75mm.