Quick answer
The Vivitar 105mm f/2.5 Auto is a short telephoto prime lens covering 105mm at f/2.5 for the M42 mount. Its bright maximum aperture handles indoor and evening light reasonably well.
About this lens
The Vivitar 105mm f/2.5 Auto is a manual-focus short-telephoto prime lens covering 105mm at f/2.5 for M42 mount cameras. The focal length is a classic choice for portraits and details.
Vivitar 105mm f/2.5 Auto specifications
What can you shoot with the Vivitar 105mm f/2.5 Auto?
At 105mm this is a short telephoto prime, which typically suits:
- Portraits with a flattering perspective
- Events and weddings
- Isolating subjects from the background
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 (adapted mount, so sensor size depends on your camera). Not measured.
| Sensor | Crop | Equivalent | Horizontal FOV | Diagonal FOV |
|---|---|---|---|---|
| Full frame | 1.0x | 105mm | 19.5° | 23.3° |
| APS-C | 1.5x | 158mm | 13° | 15.6° |
| Micro Four Thirds | 2.0x | 210mm | 9.8° | 11.8° |
Frequently asked questions
What mount does the Vivitar 105mm f/2.5 Auto use?
It uses the M42 mount, so it fits M42 cameras directly and can be used on other systems through a mount adapter.
What is the focal length of the Vivitar 105mm f/2.5 Auto?
It is a fixed 105mm lens with a maximum aperture of f/2.5. That makes it a short telephoto lens.
Is the Vivitar 105mm f/2.5 Auto a prime or a zoom lens?
It is a prime lens with a fixed 105mm focal length. Primes usually open wider than zooms; this one opens to f/2.5.
What is the Vivitar 105mm f/2.5 Auto equivalent on a crop sensor?
On APS-C (1.5x crop) it frames like 158mm on full frame, with a 13° horizontal and 15.6° diagonal field of view. On Micro Four Thirds (2x crop) it frames like 210mm on full frame, with a 9.8° horizontal and 11.8° diagonal field of view. These figures are calculated from the focal length and crop factor.
Alternatives for M42 from other brands
All M42 lensesSame mount, overlapping focal range, closest maximum aperture first.