Pentacon Auto 50mm 1:1.8 M42
M42 prime lens. Small specs of dust inside, shouldn't appear on photos.
Specifications
| Diameter | 60 mm |
| Length | 38 mm (focused at infinity) |
| Filter Thread | 49 mm (metal) |
| Weight | 194 g |
| Max. Magnification | 1:4.8 |
| Close focusing distance | 0.33 m |
| Number of aperture blades | 6 (slightly rounded) |
| Elements/Groups | 6/4 |