Lens · prime
SMC Pentax-K 85mm f/1.8
Pentax · 1975-1977
Vintage35mm
SMC Pentax-K 85mm f/1.8: 6 elements in 6 groups, 8 aperture blades, 0.85m minimum focus, 52mm filter thread, 331g.
- Focal length
- 85mm
- Max aperture
- f/1.8
- Mount
- Pentax K
- Format
- 35mm
- Elements / groups
- 6 / 6
Known for
- Portraits
- Available light
- Creative bokeh
Considerations
- Heavier than M-series equivalent
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: Beautiful 8-blade rendering
Rendering: Superb portrait character
Colour: Warm, flattering
Silverlog's editorial rating, 1 to 5; five is best. Not lab-measured.
Common issues
- Focus ring stiffness
- Oil on aperture blades
Buying guide
Check aperture operation and focus smoothness.
Specifications
| Mount | Pentax K |
| Focal Length | 85mm |
| Max Aperture | f/1.8 |
| Min Aperture | f/22 |
| Aperture Blades | 8 |
| Min Focus | 0.85m |
| Filter Size | 52mm |
| Weight | 331g |
Optical design
| Formula | Double Gauss |
| Elements | 6 |
| Groups | 6 |
| Coating | SMC (Pentax) |
Pricing
- Typical used price
- £150 - £300
- Mint
- ~£400
Indicative, no dated source.