Quick answer
The Vivitar Series 1 28-90mm f/2.8-3.5 is a wide-angle to short telephoto zoom lens covering 28-90mm at f/2.8 for the Pentax K mount. Its bright maximum aperture handles indoor and evening light reasonably well.
About this lens
Vivitar Series 1 28-90mm f/2.8-3.5: a standard zoom lens with a 28-90mm focal length and a maximum aperture of f/2.8-3.5, made for Pentax K mount cameras. The range covers everything from wide scenes to portraits, so it works as a general-purpose lens.
Vivitar Series 1 28-90mm f/2.8-3.5 specifications
What can you shoot with the Vivitar Series 1 28-90mm f/2.8-3.5?
At 28-90mm this is a wide-angle to short telephoto zoom, which typically suits:
- Landscapes and cityscapes
- Street and travel photography
- Environmental portraits and interiors
- Everyday and street photography
- Natural-perspective portraits
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 | 28–90mm | 22.6–65.5° | 27–75.4° |
| APS-C | 1.5x | 42–135mm | 15.2–46.4° | 18.2–54.5° |
Frequently asked questions
What mount does the Vivitar Series 1 28-90mm f/2.8-3.5 use?
It uses the Pentax K mount, so it fits Pentax K cameras directly.
What is the focal length of the Vivitar Series 1 28-90mm f/2.8-3.5?
It zooms across 28-90mm with a maximum aperture of f/2.8. That makes it a wide-angle to short telephoto lens.
Is the Vivitar Series 1 28-90mm f/2.8-3.5 a prime or a zoom lens?
It is a zoom lens covering 28-90mm, so you can reframe without moving. Its maximum aperture is f/2.8.
What is the Vivitar Series 1 28-90mm f/2.8-3.5 equivalent on a crop sensor?
On APS-C (1.5x crop) it frames like 42–135mm on full frame, with a 15.2–46.4° horizontal and 18.2–54.5° diagonal field of view. These figures are calculated from the focal length and crop factor.
Which cameras does the Vivitar Series 1 28-90mm f/2.8-3.5 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.
More Vivitar lenses for Pentax K
All Vivitar lensesOther 28-90mm lenses
Browse by focal length: 28mm lenses, 90mm lenses