Photo: Alex van Essen (CC BY-SA 4.0)
Quick answer
The Pentax smc Pentax Takumar 135mm f/2.5 (V2/43812) is a short telephoto prime lens covering 135mm at f/2.5 for the M42 mount. Its bright maximum aperture handles indoor and evening light reasonably well.
About this lens
The Pentax smc Pentax Takumar 135mm f/2.5 (V2/43812) is a manual-focus short-telephoto prime lens covering 135mm at f/2.5 for M42 mount cameras. A classic Takumar lens from the Pentax screw-mount era, popular for vintage-lens adapting.
Pentax smc Pentax Takumar 135mm f/2.5 (V2/43812) specifications
What can you shoot with the Pentax smc Pentax Takumar 135mm f/2.5 (V2/43812)?
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 (adapted mount, so sensor size depends on your camera). 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° |
| Micro Four Thirds | 2.0x | 270mm | 7.6° | 9.2° |
Frequently asked questions
What mount does the Pentax smc Pentax Takumar 135mm f/2.5 (V2/43812) 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 Pentax smc Pentax Takumar 135mm f/2.5 (V2/43812)?
It is a fixed 135mm lens with a maximum aperture of f/2.5. That makes it a short telephoto lens.
Is the Pentax smc Pentax Takumar 135mm f/2.5 (V2/43812) 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 smc Pentax Takumar 135mm f/2.5 (V2/43812) 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. On Micro Four Thirds (2x crop) it frames like 270mm on full frame, with a 7.6° horizontal and 9.2° 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.
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