Pentax DA 40mm lens
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| Maker | Pentax |
|---|---|
| Technical data | |
| Type | Prime |
| Focal length | 40mm |
| Focal length (35mm equiv.) | 60mm |
| Crop factor | 1.5 |
| Aperture (max/min) | f/2.8 / f/22 |
| Close focus distance | 15.7 in (0.4 m) |
| Max. magnification | 0.13x |
| Diaphragm blades | 9 |
| Construction | 5 elements in 4 groups |
| Features | |
| Manual focus override |
 Yes |
| Unique features | Pancake lens |
| Application | Normal lens |
| Physical | |
| Max. length | 0.6 in (15 mm) |
| Diameter | 2.5 in (63 mm) |
| Weight | 3.2 oz (90g) |
| Filter diameter | 49mm (30.5mm on hood) |
| Accessories | |
| Lens hood | MH-RC 49mm |
| Case | DA 40mm Lens Soft Case |
| Angle of view | |
| Diagonal | 39° |
| History | |
| Introduction | 2004 |
| Retail info | |
| MSRP | $499.95 USD |
The smc Pentax-DA 40mm f/2.8 Limited is a pancake lens for the Pentax K-mount. At only 0.6 in (15 mm) long, it was the smallest lens made by Pentax until the 40mm XS lens was introduced. The lens has a 35mm equivalent focal length of 60mm; it is part of the Limited series of high-performance compact lenses. In August 2013 it was re-released with improved lens coatings and rounded aperture blades as HD Pentax-DA 40mm f/2.8 Limited.
The SMC Pentax-DA 40mm f/2.8 XS is an even thinner version of the SMC DA 40mm lens, at 9.1 millimetres (0.36 in) thick, released by Pentax on February 2, 2012. It features an aesthetic design by Marc Newson to match the Pentax K-01. It is currently one of the thinnest lenses ever made that isn't considered a "body-cap lens".
Pentax K-30 with a smc Pentax-DA 40mm f2.8 XS lens
smc Pentax-DA 40mm f2.8 XS lens attached on a Pentax K-30 - Side view
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