Pentax M 135mm F/3.5
| Weight | 270 g |
| Length | 66 mm |
| Filter-ΓΈ | 49 mm |
| Min. Focus | 150 cm |
| Max. Magnification | 0.11x |
| Max. Aperture | F/3.5 |
| Min. Aperture | F/32 |
| Diagonal FOV | 12 degrees (APS-C), 18 degrees (24x36) |
| Horizontal FOV | 10 degrees (APS-C), 15 degrees (24x36) |
| Optical Construction | 5 elements, 5 groups, 8 blades |
| PentaxForums: | 8.53 from 10 (89 reviews) - Sharpness 8.6, Aberrations 8.3, Bokeh 8.2, Handling 9.2, Value 9.5 |