Creates beautiful Biotar style bokeh
out of focus highlights are rendered as beautiful discs(in the right conditions),
making the background swirl slightly.
Lens mount: M39/M42
Focal length: 58mm
Relative aperture: 1:2
Scale of diaphragms: from 2 to 16
Diaphragm: Manual
Focusing range: from 0.5m to 20m to infinity
Filter mount: M49x0.75