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.

28 March 2012

Obvious benefits of a pancake lens like this are the compact size and lightweight, but this lens delivers excellent sharpness too. The issues with flare and high CA levels when stopped down may be off-putting to some, but if care is taken to use this lens within its limits, it can deliver excellent...

  • +

    Excellent sharpness from maximum aperture, Thin and lightweight, Good build quality, Vignetting is well-controlled

  • -

    High CA levels towards edges of the frame when stopped down, Loss of contrast and flare when shooting into the light, Rubber lens cap falls off easily

User Reviews
11 January 2017

I'm definitely not a pro or anything but this lens gets used 80% of the time for general photography (i.e. family get to gathers, parties etc). My bro has alot higher end cannon and this setup on my camera caught his eye... very compact.

30 August 2016

Super tiny lens; it could justifiably be mistaken for a body cap. Excellent optical quality; takes sharp, vibrant pictures. It feels solid and well made. Professional reviews say it compares well with the slightly larger and much much more expensive 40mm f/2.8 limited and is superior to the much...

13 June 2017

I was skeptical about getting this lens but it does a great job! I would recommend it.

7 March 2017

have only had it for a week, but so far, seems like a great lens for the price

23 December 2016

Great pancake lens. Fast focus, very sharp. Have left it on my Pentax K5 . Did not expect it to be so useful. Light and easy for travel. May just take this and leave the heavy zoom's at home.

2 November 2016

I like it. That's my first impression after one day of use on a K20D and K30. This lens was a Warehouse Deal that came packaged in a pillow pack. See photo. Of course it was all the way inside when received. Perfectly adequate. First use was annoying for a couple minutes. Mounting seemed very tight.

30 September 2016

Amazing quality lens, beautiful design, very luminous,

25 September 2016

I absolutely LOVE this lens!!!! I have purchased lenses that cost many times more than this, that didnt excite me like this little jewel does. Its lightning fast, insanely sharp, and extremely light and small. My large bodied Pentax K-50 (Pentax RULES!!!!

5 September 2016

With this one you can take your K5/II/IIS K3/II on your pocket, everywhere. Could be great to have a 21mm with this size and prize.

2 May 2016

Love this lens. It focuses purely on the subject and makes my k-x almost a point and shoot. Really recommend it.

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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