HD Pentax DA 20-40mm f/2.8-4 ED Limited DC WR Lens (Black)

Model #23000

USA Version
Pentax 23000 1
Pentax 23000 1
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Weight 9.98 oz (283 g)
Dimensions (DxL) Approx. 2.80 x 2.72" (71 x 69 mm)
Filter Thread Front:55 mm


Camera Mount Type Pentax K
Format Compatibility Pentax Digital (APS-C)
Angle of View 70° - 39°
Tilt/Shift None
Minimum Focus Distance 11.02" (28 cm)
Elements/Groups 9/8
Diaphragm Blades 9
Magnification 0.20x
Focal Length 20 - 40mm
Comparable 35mm Focal Length: 30.5 - 61.5 mm
Aperture Maximum: f/2.8 - 4
Minimum: f/22 - 32


Autofocus Yes
Image Stabilization No
Tripod Collar No
Expert Reviews
23 January 2014

This 2x zoom lens provides an angle of view equivalent to a 30.5-61.5mm lens on a 35mm format camera, when mounted on a Pentax Digital SLR, which is neither very wide, nor very telephoto.

User Reviews
B h photo.32817553
25 December 2014

First of all I can't give an extensive review for this lens since I only had it a couple of weeks. Maybe after a few months I'll update this review to give you a better perspective on how I feel about this lens.

  • +

    Durable, Fast / accurate auto-focus, Lightweight, Nice Bokeh, Strong Construction

  • -

    Expensive Lens Cap, Limited focal range

Pentaxforums com.33034397
17 July 2015

I bought this lens during a special offer period, and it has hardly been off my K-5 since. My previous standard zoom was the 16-45 which was itself a step up from the kit zoom, but the images from the 20-40 have something about them. Flare resistance is incredible.

  • +

    IQ, general solidity and 'feel', construction quality, zoom smoothness, manual focus over-ride smoothness

  • -


25 March 2014

Bought this lens to replace my kit 18-55 WR lens when I'm hiking and other cases when I can carry only 1 lens and might need WR. The 20-40 is actually bigger in size than the 18-55 but not by much.I am mostly using it for landscapes.It has better contrast and colors than the 18-55 andmight be...

  • +

    Lightweight, Nice Bokeh, Weather sealed

  • -

    Big, Expensive, Limited zoom range

8 February 2015

This lens is not perfect but it is light, compact, well built, and weather sealed. Image quality is very sharp wide open and excellent stopped down. In general I find this lens renders colors very, very well. Things just pop in a similar way to how they pop from a Pentax DA* 55mm.

Product Highlights
  • Pentax K Mount
  • 30.5-61.5mm (35mm Equivalent)
  • Aperture Range: f/2.8-32
  • ED and Super-Low Dispersion Elements
  • High-Grade Multi-Layer HD Coating
  • Weather-Resistant Seals and SP Coating
  • Smooth & Quiet DC Auto Focus Motor
  • Quick-Shift Focus System
  • Rounded Nine-Blade Diaphragm
  • First Limited Series Zoom Lens
Average Expert Score
Average User Score
In The Box
  • Pentax HD Pentax DA 20-40mm f/2.8-4 ED Limited DC WR Lens (Black)
  • Front Lens Cap
  • Rear Lens Cap
  • MH-RA55 Lens Hood
  • Lens Pouch
  • Limited 1-year Warranty
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