Quick answer
The Vivitar 28mm f/2.5 Auto Wide-Angle is a wide-angle prime lens covering 28mm at f/2.5 for the Pentax K mount. Its bright maximum aperture handles indoor and evening light reasonably well.
About this lens
A 28mm f/2.5 wide-angle prime lens, the Vivitar 28mm f/2.5 Auto Wide-Angle is designed for Pentax K mount bodies. The wide view suits landscapes, architecture and environmental shots.
Vivitar 28mm f/2.5 Auto Wide-Angle specifications
What can you shoot with the Vivitar 28mm f/2.5 Auto Wide-Angle?
At 28mm this is a wide-angle prime, which typically suits:
- Landscapes and cityscapes
- Street and travel photography
- Environmental portraits and interiors
Its bright maximum aperture handles indoor and evening light reasonably well.
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 | 28mm | 65.5° | 75.4° |
| APS-C | 1.5x | 42mm | 46.4° | 54.5° |
Frequently asked questions
What mount does the Vivitar 28mm f/2.5 Auto Wide-Angle use?
It uses the Pentax K mount, so it fits Pentax K cameras directly.
What is the focal length of the Vivitar 28mm f/2.5 Auto Wide-Angle?
It is a fixed 28mm lens with a maximum aperture of f/2.5. That makes it a wide-angle lens.
Is the Vivitar 28mm f/2.5 Auto Wide-Angle a prime or a zoom lens?
It is a prime lens with a fixed 28mm focal length. Primes usually open wider than zooms; this one opens to f/2.5.
What is the Vivitar 28mm f/2.5 Auto Wide-Angle equivalent on a crop sensor?
On APS-C (1.5x crop) it frames like 42mm on full frame, with a 46.4° horizontal and 54.5° diagonal field of view. These figures are calculated from the focal length and crop factor.
Which cameras does the Vivitar 28mm f/2.5 Auto Wide-Angle 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.
