Lens · prime
SMC Pentax-M 135mm f/3.5
Pentax · 1977-1986
Vintage35mm
Pentax's compact 135mm telephoto. Built-in sliding hood adds practicality. SMC Pentax-M 135mm f/3.5: 5 elements in 5 groups, 8 aperture blades, 1.5m minimum focus, 49mm filter thread, 270g.
- Focal length
- 135mm
- Max aperture
- f/3.5
- Mount
- Pentax K
- Format
- 35mm
- Elements / groups
- 5 / 5
Known for
- Portraits
- Wildlife
- Events
Considerations
- f/3.5 limits low light
- 1.5m minimum focus
Optical characteristics
Silverlog's editorial rating: our own judgement, not measured data.
Sharpness (wide)4, level 4 of 5
Sharpness (stopped)5, level 5 of 5
Contrast5, level 5 of 5
Flare resistance5, level 5 of 5
CA control4, level 4 of 5
Vignetting control4, level 4 of 5
Distortion control5, level 5 of 5
Bokeh: Smooth telephoto
Rendering: Sharp, clean
Colour: Neutral
Silverlog's editorial rating, 1 to 5; five is best. Not lab-measured.
Common issues
- Hood mechanism wear
- Focus ring stiffness
Buying guide
Check hood mechanism and focus smoothness.
Specifications
| Mount | Pentax K |
| Focal Length | 135mm |
| Max Aperture | f/3.5 |
| Min Aperture | f/32 |
| Aperture Blades | 8 |
| Min Focus | 1.5m |
| Filter Size | 49mm |
| Weight | 270g |
Optical design
| Formula | Telephoto |
| Elements | 5 |
| Groups | 5 |
| Coating | SMC (Pentax) |
Pricing
- Typical used price
- £30 - £60
- Mint
- ~£90
Indicative, no dated source.