Focal length: 50mm (52.42mm)
Aperture ratio: 1: 2.8
Field of view: 46 °
Frame size: 24 × 36 mm
Number of lenses / groups: 4/3
Front top focal length: -43.78mm
Focal Length Rear Top: 41.07mm
Distance from first to last surface: 22.9 mm
Flange spacing: 45.5mm
Aperture Scale Limits: 1: 2.8-1: 16
Aperture blades: 5
Please any questions!Have a nice day!