Pentax DA 40mm f/2.8 XS Lens

Model #22137

USA Version
Pentax 22137 1
Pentax 22137 1
Pentax 22137 5
Pentax 22137 2
Pentax 22137 4
Pentax 22137 3
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Dimensions (dxl) Approx. 2.5 x 0.36" (63.50 x 9.14 mm)
Filter thread Front: 27 mm
Weight 1.8 oz (51 g)


Focal length 61 mm
Comparable APS-C Focal Length: 40 mm
Aperture Maximum: f/2.8
Minimum: f/22
Format compatibility Pentax Digital (APS-C)
Groups/elements 4/5
Diaphragm blades 9
Minimum focus distance 15.72" (39.93 cm)
Magnification 0.13x
Angle of view 39°
Camera mount type Pentax K


Autofocus Yes
Image stabilization No
Expert Reviews
28 March 2012

This compact pancake lens, released with the Pentax K-01 camera has a bright maximum aperture of f/2.8 and is currently the thinnest interchangeable fixed focal length lens compatible with an APS-C format camera, being under a centimetre thick.

User Reviews
B h photo.32817553
14 June 2012

I am just a photography enthusiast. The only things that are important to me in terms of lenses are how the pictures look and does the lens impede my shot. The first thing you'll notice about this lens is that it is tiny. It takes up almost no space in your bag and it weighs almost nothing.

  • +

    Consistent Output, Fast / accurate auto-focus, Lightweight

  • -

    Tough To Attach

17 August 2015

its a great lens sharp good color but for my hand it was to hard toget on and off. would like to have kept it .if I had an extra body I would have made it a real point and shoot.

19 January 2016

Bought this for using on a K-5 while engaging in dual sport motorcycle riding. Will be a good compact light-weight way to capture scenic photos. Anticipate it will also allow unobtrusive candid street shots.

Product Highlights
  • For Pentax K-01 Mirrorless Camera
  • 60mm Focal Length (35mm Equivalent)
  • Low Profile Design is 0.36" Thick
  • Short 15.72" Minimum Focusing Distance
  • Pentax KAF Mount
  • Aesthetic Design by Marc Newson
Average Expert Score
Average User Score
In The Box
  • Pentax DA 40mm f/2.8 XS Lens
  • O-LC27 27mm Lens Cap
  • Rear Lens Cap (B) for Bayonet Mount Lenses
  • Limited 1-Year Warranty
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