Lens · prime
SMC Pentax-M* 300mm f/4
Pentax · 1981-1984
Discontinued35mm
Long telephoto for wildlife and sports. SMC Pentax-M* 300mm f/4: 8 elements in 7 groups, 8 aperture blades, 4.0m minimum focus, 77mm filter thread, 825g.
- Focal length
- 300mm
- Max aperture
- f/4
- Mount
- Pentax K
- Format
- 35mm
- Elements / groups
- 8 / 7
Known for
- Wildlife
- Sports
- Birds
Considerations
- Needs tripod
- Heavy
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 control4, level 4 of 5
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 | 300mm |
| Max Aperture | f/4 |
| Min Aperture | f/32 |
| Aperture Blades | 8 |
| Min Focus | 4m |
| Filter Size | 77mm |
| Weight | 825g |
Optical design
| Formula | Telephoto |
| Elements | 8 |
| Groups | 7 |
| Coating | SMC (Pentax) |
Pricing
- Typical used price
- £120 - £220
- Mint
- ~£300
Indicative, no dated source.