Photo: Alex van Essen (CC BY-SA 4.0)
Quick answer
The Pentax Takumar 135mm f/2.5 Bayonet is a short telephoto prime lens covering 135mm at f/2.5 for the Pentax K mount. Its bright maximum aperture handles indoor and evening light reasonably well.
About this lens
A 135mm f/2.5 short-telephoto prime lens, the Pentax Takumar 135mm f/2.5 Bayonet is designed for Pentax K mount bodies. A classic Takumar lens from the Pentax screw-mount era, popular for vintage-lens adapting.
Pentax Takumar 135mm f/2.5 Bayonet specifications
What can you shoot with the Pentax Takumar 135mm f/2.5 Bayonet?
At 135mm 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. Not measured.
| Sensor | Crop | Equivalent | Horizontal FOV | Diagonal FOV |
|---|---|---|---|---|
| Full frame | 1.0x | 135mm | 15.2° | 18.2° |
| APS-C | 1.5x | 203mm | 10.2° | 12.2° |
Frequently asked questions
What mount does the Pentax Takumar 135mm f/2.5 Bayonet use?
It uses the Pentax K mount, so it fits Pentax K cameras directly.
What is the focal length of the Pentax Takumar 135mm f/2.5 Bayonet?
It is a fixed 135mm lens with a maximum aperture of f/2.5. That makes it a short telephoto lens.
Is the Pentax Takumar 135mm f/2.5 Bayonet a prime or a zoom lens?
It is a prime lens with a fixed 135mm focal length. Primes usually open wider than zooms; this one opens to f/2.5.
What is the Pentax Takumar 135mm f/2.5 Bayonet equivalent on a crop sensor?
On APS-C (1.5x crop) it frames like 203mm on full frame, with a 10.2° horizontal and 12.2° diagonal field of view. These figures are calculated from the focal length and crop factor.
Which cameras does the Pentax Takumar 135mm f/2.5 Bayonet 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.
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