The lens is in excellent condition!!! Professional service
Focal length: 50mm
Diaphragm: f/3.5 - f/16.0
Number of aperture blades: 7 pieces
The weight: 70 g
Optical design: 4 elements in 3 groups
Thread: M42
Filter Diameter: 35mm (there are also 33.5mm lenses)
MDF: 0.65 meter