Quick answer
The Tamron SP 135mm f/2.5 Adaptall-2 is a short telephoto telephoto 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
The Tamron SP 135mm f/2.5 Adaptall-2 is a short-telephoto prime lens covering 135mm at f/2.5 for Pentax K mount cameras, from the Tamron SP series. The focal length is a classic choice for portraits and details.
Tamron SP 135mm f/2.5 Adaptall-2 specifications
- Brand
- Tamron
- Mount
- Pentax K
- Focal length
- 135mm
- Maximum aperture
- f/2.5
- Lens type
- Telephoto
- Format coverage
- full-frame
- Released
- 1979
- Optical construction
- 4 elements in 4 groups
- Autofocus motor
- none
- Minimum focus distance
- 1.2 m
- Filter thread
- 58 mm
- Weight
- 410 g
- Length
- 84 mm
- Diameter
- 68 mm
Specification source: en.wikipedia.org
What can you shoot with the Tamron SP 135mm f/2.5 Adaptall-2?
At 135mm this is a short telephoto telephoto, 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 Tamron SP 135mm f/2.5 Adaptall-2 use?
It uses the Pentax K mount, so it fits Pentax K cameras directly.
What is the focal length of the Tamron SP 135mm f/2.5 Adaptall-2?
It is a fixed 135mm lens with a maximum aperture of f/2.5. That makes it a short telephoto lens.
Is the Tamron SP 135mm f/2.5 Adaptall-2 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 Tamron SP 135mm f/2.5 Adaptall-2 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 Tamron SP 135mm f/2.5 Adaptall-2 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.
