Photo: Kurt Bauschardt from Edmonton, Canada (CC BY-SA 2.0)
Quick answer
The Tamron 500mm f/8 Mirror Adaptall-2 is a super telephoto mirror lens covering 500mm at f/8.0 for the Pentax K mount. Its smaller maximum aperture favours daylight shooting and keeps the lens compact.
About this lens
The Tamron 500mm f/8 Mirror Adaptall-2 is a mirror telephoto lens covering 500mm at f/8 for Pentax K mount cameras. Its catadioptric design keeps a long focal length compact and light.
Tamron 500mm f/8 Mirror Adaptall-2 specifications
- Brand
- Tamron
- Mount
- Pentax K
- Focal length
- 500mm
- Maximum aperture
- f/8.0
- Lens type
- Mirror
- Format coverage
- full-frame
- Optical construction
- 7 elements in 4 groups
- Autofocus motor
- none
- Minimum focus distance
- 1.7 m
Specification source: en.wikipedia.org
What can you shoot with the Tamron 500mm f/8 Mirror Adaptall-2?
At 500mm this is a super telephoto mirror, which typically suits:
- Wildlife and birds
- Motorsport and field sports
- Distant subjects and the moon
Its smaller maximum aperture favours daylight shooting and keeps the lens compact.
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 | 500mm | 4.1° | 5° |
| APS-C | 1.5x | 750mm | 2.7° | 3.3° |
Frequently asked questions
What mount does the Tamron 500mm f/8 Mirror Adaptall-2 use?
It uses the Pentax K mount, so it fits Pentax K cameras directly.
What is the focal length of the Tamron 500mm f/8 Mirror Adaptall-2?
It is a fixed 500mm lens with a maximum aperture of f/8.0. That makes it a super telephoto lens.
Is the Tamron 500mm f/8 Mirror Adaptall-2 a prime or a zoom lens?
It is a prime lens with a fixed 500mm focal length. Primes usually open wider than zooms; this one opens to f/8.0.
What is the Tamron 500mm f/8 Mirror Adaptall-2 equivalent on a crop sensor?
On APS-C (1.5x crop) it frames like 750mm on full frame, with a 2.7° horizontal and 3.3° diagonal field of view. These figures are calculated from the focal length and crop factor.
Which cameras does the Tamron 500mm f/8 Mirror 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.
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