Quick answer
The Sigma 500mm f/4.5 APO EX DG HSM is a super telephoto telephoto lens covering 500mm at f/4.5 for the Pentax K mount. Its smaller maximum aperture favours daylight shooting and keeps the lens compact.
About this lens
A 500mm f/4.5 full-frame telephoto prime lens, the Sigma 500mm f/4.5 APO EX DG HSM is designed for Pentax K mount bodies, with Hyper Sonic Motor autofocus and apochromatic correction. It brings distant subjects closer for sports, wildlife and events.
Sigma 500mm f/4.5 APO EX DG HSM specifications
What can you shoot with the Sigma 500mm f/4.5 APO EX DG HSM?
At 500mm this is a super telephoto telephoto, which typically suits:
- Wildlife and birds
- Motorsport and field sports
- Distant subjects and the moon
Its smaller maximum aperture favours daylight shooting and keeps the lens compact.
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 | 500mm | 4.1° | 5° |
| APS-C | 1.5x | 750mm | 2.7° | 3.3° |
Frequently asked questions
What mount does the Sigma 500mm f/4.5 APO EX DG HSM use?
It uses the Pentax K mount, so it fits Pentax K cameras directly.
What is the focal length of the Sigma 500mm f/4.5 APO EX DG HSM?
It is a fixed 500mm lens with a maximum aperture of f/4.5. That makes it a super telephoto lens.
Is the Sigma 500mm f/4.5 APO EX DG HSM a prime or a zoom lens?
It is a prime lens with a fixed 500mm focal length. Primes usually open wider than zooms; this one opens to f/4.5.
What is the Sigma 500mm f/4.5 APO EX DG HSM equivalent on a crop sensor?
On APS-C (1.5x crop) it frames like 750mm on full frame, with a 2.7° horizontal and 3.3° diagonal field of view. These figures are calculated from the focal length and crop factor.
Which cameras does the Sigma 500mm f/4.5 APO EX DG HSM 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.
