Lens · prime
SMC Pentax-A 28mm f/2
Pentax · 1984-1988
Discontinued35mm
Fast wide-angle for low light. SMC Pentax-A 28mm f/2: 8 elements in 7 groups, 6 aperture blades, 0.3m minimum focus, 49mm filter thread, 215g.
- Focal length
- 28mm
- Max aperture
- f/2
- Mount
- Pentax K
- Format
- 35mm
- Elements / groups
- 8 / 7
Known for
- Street photography
- Low light
- Interiors
Considerations
- Some barrel distortion
- Edge softness wide open
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
Contrast4, level 4 of 5
Flare resistance4, level 4 of 5
CA control3, level 3 of 5
Vignetting control3, level 3 of 5
Distortion control3, level 3 of 5
Bokeh: Smooth, pleasant character
Silverlog's editorial rating, 1 to 5; five is best. Not lab-measured.
Common issues
- Check for fungus
- Inspect aperture blades
Buying guide
Check aperture operation, focus smoothness and the condition of the glass and coatings.
Specifications
| Mount | Pentax K |
| Focal Length | 28mm |
| Max Aperture | f/2 |
| Min Aperture | f/22 |
| Aperture Blades | 6 |
| Min Focus | 0.3m |
| Filter Size | 49mm |
| Weight | 215g |
Optical design
| Formula | Retrofocus |
| Elements | 8 |
| Groups | 7 |
| Coating | SMC (Pentax) |
Pricing
- Typical used price
- £200 - £350
- Mint
- ~£450
Indicative, no dated source.