Pentax 21mm f/3.2 Lens

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An Extremely Thin, Compact
and Light-weight Wide Angle Lens

Pentax 21mm f/3.2 Lens The Pentax DA 21mm f/3.2 Limited Lens is an extremely thin, compact and light-weight wide angle lens, designed exclusively for Pentax digital SLR cameras. This lens measures only 1" (25mm) long, and weighs a mere 4.9 ounces (140 grams).

This versatile angle of view produces natural images with a moderate perspective and an expanded depth of field (or a wide in-focus area), making it ideal for many different types of subjects and occasions, including snapshots, landscape, travel photos, and architecture.

The image circle in DA-series lenses is designed to perfectly match the 23.5mm x 15.7mm size of the CCD used in Pentax digital SLR cameras to optimize camera performance. This design also contributes to a drastic reduction in size, weight and production cost, compared to 35mm-format counterparts with similar specifications.

This lens has a unique bayonet lenshood featuring a 43mm filter thread upon the inside of the hood itself. It isn't possible to use 49mm filters on the lens barrel with the special hood in place, and this hood in particular is a brilliantly-effective stray light eliminator, so if you wish to use a filter and the lens hood simultaneously it must be a 43mm filter.

Note! Not suitable for 35mm film SLR cameras 


Limited lens-series quality for distinctive visual description and a premium appearance

Includes hybrid aspherical lens in its eighth optical element to effectively compensate for a variety of aberrations

Floating lens mechanism, designed to adjust the degree of aberration compensation in relation to the focusing distance

SP coating to protect the lens against water and grease

Minimum focusing distance of 8" (20 cm) for close-up photography

Dual filter attachment design; conventional 49mm threading upon lens barrel & 43mm threading inside dedicated hood

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Lens stylePrime lens  
Max Format Size APS-C / DX  
Lens focal length21 mm  
Stabilization type No  
Camera mount Pentax KAF  
Angle of view 68 (when used with digital camera)  
Largest aperture opening F3.2  
Smallest aperture opening F22.0  
Includes aperture ring Yes  
Total diaphragm blades 7  
Total Elements 8  
Number of Groups 5  
Minimum focus distance 0.20 m (7.87")  
Maximum magnification ratio 0.17 x  
Autofocus type Yes  
Lens motor Screw drive from camera  
Full time manual focus Yes  
Focus notes floating element  
Overall weight140 g (0.31 lb) 4.9 oz  
Lens diameter 63 mm (2.48")  
Overall length 25 mm (0.98")  
Lens color Black  
Filter thread size 49 mm  
Lens hood included Yes  
Tripod collar included No

Lens Includes
Pentax Wide Angle SMCP-DA 21mm f/3.2 AL Limited Series Autofocus Lens
Front Lens Cap (#37747)
MH-RBA Lens Hood (#38748)
21mm Soft Lens Pouch
1-Year Warranty


Pentax 21mm f/3.2 Lens

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