smc Pentax-DA 21mm f/3.2 AL Limited
- 21mm
- f/3.2
- Prime
- 140 g
- Min focus 0.2 m
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Quick answer
The Pentax smc Pentax-DA 21mm f/3.2 AL Limited is a ultra-wide prime lens covering 21mm at f/3.2 for the Pentax K mount. Its moderate maximum aperture works best in good light or with a higher ISO.
About this lens
Pentax smc Pentax-DA 21mm f/3.2 AL Limited: a wide-angle prime lens with a 21mm focal length and a maximum aperture of f/3.2, made for Pentax K mount cameras. A compact, metal-bodied Limited-series prime for Pentax K-mount cameras.
Pentax smc Pentax-DA 21mm f/3.2 AL Limited specifications
- Brand
- Pentax
- Mount
- Pentax K
- Focal length
- 21mm
- Maximum aperture
- f/3.2
- Lens type
- Prime
- Format coverage
- aps-c
- Released
- 2006
- Optical construction
- 8 elements in 5 groups
- Aperture blades
- 7
- Autofocus motor
- screw-drive
- Minimum focus distance
- 0.2 m
- Maximum magnification
- 0.17x
- Filter thread
- 49 mm
- Weight
- 140 g
- Length
- 25 mm
- Diameter
- 63 mm
Specification source: en.wikipedia.org
What can you shoot with the Pentax smc Pentax-DA 21mm f/3.2 AL Limited?
At 21mm this is a ultra-wide prime, which typically suits:
- Landscapes and big skies
- Architecture and interiors
- Astrophotography and night skies
Its moderate maximum aperture works best in good light or with a higher ISO.
Full-frame equivalent and field of view
Calculated from the focal length and crop factor. Not measured.
| Sensor | Crop | Equivalent | Horizontal FOV | Diagonal FOV |
|---|---|---|---|---|
| APS-C | 1.5x | 32mm | 59.5° | 69° |
Frequently asked questions
What mount does the Pentax smc Pentax-DA 21mm f/3.2 AL Limited use?
It uses the Pentax K mount, so it fits Pentax K cameras directly.
What is the focal length of the Pentax smc Pentax-DA 21mm f/3.2 AL Limited?
It is a fixed 21mm lens with a maximum aperture of f/3.2. That makes it a ultra-wide lens.
Is the Pentax smc Pentax-DA 21mm f/3.2 AL Limited a prime or a zoom lens?
It is a prime lens with a fixed 21mm focal length. Primes usually open wider than zooms; this one opens to f/3.2.
What is the Pentax smc Pentax-DA 21mm f/3.2 AL Limited equivalent on a crop sensor?
On APS-C (1.5x crop) it frames like 32mm on full frame, with a 59.5° horizontal and 69° diagonal field of view. These figures are calculated from the focal length and crop factor.
Which cameras does the Pentax smc Pentax-DA 21mm f/3.2 AL Limited 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.
