Quick answer
The Pentax smc Pentax-M 300mm f/4 is a telephoto telephoto lens covering 300mm at f/4.0 for the Pentax K mount. Its moderate maximum aperture works best in good light or with a higher ISO.
About this lens
A 300mm f/4 telephoto prime lens, the Pentax smc Pentax-M 300mm f/4 is designed for Pentax K mount bodies. It brings distant subjects closer for sports, wildlife and events.
Pentax smc Pentax-M 300mm f/4 specifications
What can you shoot with the Pentax smc Pentax-M 300mm f/4?
At 300mm this is a telephoto telephoto, which typically suits:
- Sports and action
- Wildlife and birds at moderate distance
- Compressing distant landscapes
Its moderate maximum aperture works best in good light or with a higher ISO.
Full-frame equivalent and field of view
Calculated from the focal length and crop factor. Not measured.
| Sensor | Crop | Equivalent | Horizontal FOV | Diagonal FOV |
|---|---|---|---|---|
| Full frame | 1.0x | 300mm | 6.9° | 8.2° |
| APS-C | 1.5x | 450mm | 4.6° | 5.5° |
Frequently asked questions
What mount does the Pentax smc Pentax-M 300mm f/4 use?
It uses the Pentax K mount, so it fits Pentax K cameras directly.
What is the focal length of the Pentax smc Pentax-M 300mm f/4?
It is a fixed 300mm lens with a maximum aperture of f/4.0. That makes it a telephoto lens.
Is the Pentax smc Pentax-M 300mm f/4 a prime or a zoom lens?
It is a prime lens with a fixed 300mm focal length. Primes usually open wider than zooms; this one opens to f/4.0.
What is the Pentax smc Pentax-M 300mm f/4 equivalent on a crop sensor?
On APS-C (1.5x crop) it frames like 450mm on full frame, with a 4.6° horizontal and 5.5° diagonal field of view. These figures are calculated from the focal length and crop factor.
Which cameras does the Pentax smc Pentax-M 300mm f/4 fit?
Any Pentax K-mount camera, including Pentax K-1, Pentax K-3, Pentax K-3 II, Pentax K-3 Mark III, and Pentax K-30 and 15 more.
Alternatives for Pentax K from other brands
All Pentax K lensesSame mount, overlapping focal range, closest maximum aperture first.
