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.

Note: Not suitable for 35mm film SLR cameras

Features

* 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

Reviews

Pentax SMC-DA 21mm f/3.2 AL Limited Interchangeable Lens Review by ephotozine.com

Mechanically well engineered and giving good resolution results across the frame and aperture range, this lens makes a nice, but not exceptional wide angle addition to the kit with virtually no space or weight penalty. A pricey headline figure, but expect to find it well discounted.

In summary, the positive points of the SMC Pentax DA 21mm f/3.2 AL Limited are:

• Compact in the extreme

• Good resolution across the frame

• Good build quality gives confidence in longevity

The negative points are:

• Some barrel distortion

• Some CA when stopped well down.

• Price