HD Pentax DA 40mm f/2.8 Limited Lens (Silver)

Model #21400

USA Version
Pentax 21400 1
Pentax 21400 1
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Weight 3.1 oz (88 g)
Filter thread Front: 49 mm
Dimensions (dxl) Approx. 2.5 x 0.6" (63.50 x 15.24 mm)


Magnification 0.13x
Groups/elements 4/5
Angle of view 39°
Focal length 40 mm
Comparable 35mm Focal Length: 60 mm
Diaphragm blades 9
Aperture Maximum: f/2.8
Minimum: f/22
Minimum focus distance 1.31' (40 cm)
Camera mount type Pentax K
Format compatibility Pentax Digital (APS-C)


Autofocus Yes
Expert Reviews
Camera labs.32824899
1 April 2007

There’s no denying the Pentax DA 40mm and 70mm Limited lenses are pretty special. Their incredibly compact design is pretty much unique to Pentax and unlike anything offered by other DSLR manufacturers.The DA 40mm f2.8 Limited is particularly impressive in this regard, measuring just 15mm thick.

  • +

    Extremely thin lens – only 15mm thick, Quality construction, Aluminium lens hood and cap supplied, Unique standard lens option, Very thin lens – only 26mm thick, Fast f2.4 aperture, Quality construction, Aluminium lens hood and cap supplied

  • -

    Hardly anything to hold onto, Slow to unscrew lens cap, Some softness on our sample, Audible auto-focusing with K10D, Coloured fringing seen across frame, Not much to grip onto, Audible auto-focusing with K10D, Lens cap only fits over lens hood

6 June 2010

If you want a discreet, easily pocketable or lightweight lens then this is the one to have. With the metal lens hood and cap screwed into place, the build is up to knocking around in a handbag or glove compartment without worries.

  • +

    Size and weight are minimal, Hood/cap arrangement afford good protection, Cute little carry pouch.

  • -

    Screw-in lens cap is fiddly to remove, Optically good enough but not stunning.

User Reviews
Pentaxforums com.33034397
8 February 2016

If you are reading this review, you're probably wondering about whether or not you should buy this lens. The answer is yes, yes you should. It is absolutely superb and only costs, what, $280 now? Why are you still reading this review? Go! Make your purchase!

  • +

    Tiny, incredibly sharp, relatively inexpensive

  • -

    Weird bokeh for point sources of light, could be faster

B h photo.32817553
19 October 2014

Paired it with my new K-5IIs, image quality is very close to a full frame format.

26 December 2014

This lens fills the gap between the DA HD 21mm and the DA HD 70mm Lens for me. I used the same subject for all three lens and took multiple shots with each lens. THE IQ either equaled or surpassed the results of the other two lenses. Color rendition is great for all three.

Product Highlights
  • Pentax K Mount
  • 60mm (35mm Equivalent)
  • Aperture Range: f/2.8 to f/22
  • Compact Pancake-Style Design
  • High-Grade Multi-Layer HD Coating
  • Super Protect Lens Coating
  • Quick-Shift Focus System
  • Nine-Blade Diaphragm
Average Expert Score
Average User Score
In The Box
  • Pentax HD Pentax DA 40mm f/2.8 Limited Lens (Silver)
  • Lens Cap
  • Metal Lens Hood
  • Rear Lens Cap (B) for Bayonet Mount Lenses
  • Soft Lens Case
  • Limited 1-Year Warranty
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