Lens · prime
SMC Pentax-A 135mm f/2.8
Pentax · 1983-1989
Vintage35mm
Pentax's A-series portrait telephoto. Built-in hood adds practicality. SMC Pentax-A 135mm f/2.8: 4 elements in 4 groups, 8 aperture blades, 1.2m minimum focus, 52mm filter thread, 340g.
- Focal length
- 135mm
- Max aperture
- f/2.8
- Mount
- Pentax K
- Format
- 35mm
- Elements / groups
- 4 / 4
Known for
- Portraits
- Events
- Available light telephoto
- Sports
Considerations
- f/2.8 slower than some alternatives
- 1.2m 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 8-blade telephoto
Rendering: Classic telephoto character
Colour: Neutral
Silverlog's editorial rating, 1 to 5; five is best. Not lab-measured.
Common issues
- Hood mechanism
- Focus ring stiffness
Buying guide
Check hood mechanism and focus operation.
Specifications
| Mount | Pentax K |
| Focal Length | 135mm |
| Max Aperture | f/2.8 |
| Min Aperture | f/32 |
| Aperture Blades | 8 |
| Min Focus | 1.2m |
| Filter Size | 52mm |
| Weight | 340g |
Optical design
| Formula | Telephoto |
| Elements | 4 |
| Groups | 4 |
| Coating | SMC (Pentax) |
Pricing
- Typical used price
- £60 - £110
- Mint
- ~£150
Indicative, no dated source.