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

BH #PE204028B • MFR #23000
Pentax HD Pentax DA 20-40mm f/2.8-4 ED Limited DC WR Lens (Black)
Key Features
  • Pentax K Mount
  • 30.5-61.5mm (35mm Equivalent)
  • Aperture Range: f/2.8-32
  • ED and Super-Low Dispersion Elements
The black HD Pentax DA 20-40mm f/2.8-4 ED Limited DC WR Lens from Pentax is a high performance standard length zoom lens for K-mount APS-C cameras. Its 35mm focal length equivalency is 30.5-61.5mm providing a versatile and practical range for wide-angle to standard length shooting. It is the first zoom lens in the Pentax Limited Series line and brings with it a durable, weather-sealed body, HD lens coating and an optical design consisting of one ED element and one super-low dispersion element.
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Pentax DA 20-40mm f/2.8-4 ED Limited DC WR Overview

  • 1Description
  • 230.5 to 61.5mm Focal Length Equivalency and f/2.8 Maximum Aperture
  • 3HD Lens Coating
  • 4DC Autofocus Motor
  • 5Quick-Shift Focus System
  • 6Weather-Resistant Construction and Durable Aluminum Barrel
  • 7SP Lens Coating
  • 8Optical Design
  • 9Rounded Diaphragm Blades

The black HD Pentax DA 20-40mm f/2.8-4 ED Limited DC WR Lens from Pentax is a high performance standard length zoom lens for K-mount APS-C cameras. Its 35mm focal length equivalency is 30.5-61.5mm providing a versatile and practical range for wide-angle to standard length shooting. It is the first zoom lens in the Pentax Limited Series line and brings with it a durable, weather-sealed body, HD lens coating and an optical design consisting of one ED element and one super-low dispersion element.

The f/2.8-4 maximum aperture enables effective low light shooting and, at the wide-angle end, control over its shallow depth of field for images that place sharp focus on the subject with a pleasing out of focus background. An in-lens direct current (DC) focus motor provides smooth and quiet autofocus action and its Quick-Shift Focus System enables rapid shift from autofocus to manual focus mode.

The lens barrel and the included hood are made from high-grade aluminum alloy, distance and depth of field scales are clearly marked on the barrel and a smooth rotating, knurled ring provides manual focus control. SP (Super Protect) coating on the front and rear lens elements repels dust, water and grease to help maintain peak performance.

30.5 to 61.5mm Focal Length Equivalency and f/2.8 Maximum Aperture

With its 2x zoom coverage of 20-40mm, this lens offers focal length coverage from 30.5 to 61.5mm in the 35mm format when mounted on a PENTAX K-series DSLR. This covers a practical set of frequently used focal lengths and is ideal as a versatile everyday lens. Its maximum aperture of f/2.8 at the wide-angle end of the zoom is effective in low light and provides shallow depth of field focus.

HD Lens Coating

This lens has been treated with the PENTAX-developed HD coating, a high grade, multi-layer coating that reduces unwanted reflection, allowing the user to capture high-contrast images free of flare and ghosting.

DC Autofocus Motor

Shoot discreetly with in-lens, direct current (DC) Auto Focus motor operation for smooth & quiet performance.

Quick-Shift Focus System

The Quick-Shift Focus System allows instant switching from autofocus to manual focus operation.

Weather-Resistant Construction and Durable Aluminum Barrel

With seven special seals to prevent intrusion of water, moisture and dust, this is the first lens of the "Limited" series to feature the PENTAX-original weather-resistant construction. With a handsome and durable aluminum alloy barrel and weather-sealing, this lens is able to perform in almost any shooting condition.

SP Lens Coating

The PENTAX SP (Super Protect) coating on the front and rear lens elements repels dust, water and grease to keep your lens clean and your images sharp.

Optical Design

The ED (Extra-low Dispersion) glass and a super-low dispersion glass element in this lens' optics deliver clear, high resolution imagery with edge-to-edge sharpness, throughout the entire zoom range.

Rounded Diaphragm Blades

Enhanced with a rounded nine-blade diaphragm at the wide apertures for optimal optical performance and gorgeous bokeh effects.
UPC: 027075274747

Pentax DA 20-40mm f/2.8-4 ED Limited DC WR Specs

Focal Length20 to 40mm (35mm Equivalent Focal Length: 30.5 to 61.5mm)
Maximum Aperturef/2.8 to 4
Minimum Aperturef/22 to 32
Lens MountPentax K
Lens Format CoverageAPS-C
Angle of View70° to 39°
Minimum Focus Distance11.02" / 28 cm
Maximum Magnification0.2x
Optical Design9 Elements in 8 Groups
Diaphragm Blades9
Focus TypeAutofocus
Image StabilizationNo
Filter Size55 mm (Front)
Dimensions (ø x L)2.8 x 2.72" / 71 x 69 mm
Weight9.98 oz / 283 g
Packaging Info
Package Weight1.09 lb
Box Dimensions (LxWxH)6.1 x 3.9 x 3.85"

Pentax DA 20-40mm f/2.8-4 ED Limited DC WR Reviews

Pentax Lens 20-40mm f2.8

By James
Rated 5 out of 5
Date: 2022-01-03

Wow what a Great Lens, Shot pics of the grandkids on Christmas Day opening gifts, Beautiful wide angle shots. Could not backup anymore so I put this lens on and what a wonderful bunch of Pictures

Wonderful walk around lens

By David
Rated 5 out of 5
Date: 2021-05-24

This lens is a pleasure to use and takes very high quality pictures. As someone else told me, it is like having 2 prime lenses (20 and 40 mm) in one housing. The only problem I had was I initially purchased a 55 mm Tiffen UV filter to protect the lens. BIG mistake. As I learned the hard way, never put a cheap UV filter on an expensive lens. It degrades resolution. I replaced the junk Tiffen with a B+W UV Haze filter and image quality is excellent. See the photo for a crop of images taken at F/2.8 and 20 mm focal length, with No filter and a B+W UV-Haze filter. I can not see any difference. While the Tiffen image (not shown here) was badly degraded.

Great lens, superb photos

By Edward
Rated 5 out of 5
Date: 2021-05-20

It's a Pentax Limited. There might have been some sample variation early on, that's why the online reviews are mixed. But a good copy is stunning! It's even better on the K3 III. These two were made for each other! Great focal length as well. Perfect normal zoom.

Absolutely love this lens

By Willem
Rated 5 out of 5
Date: 2021-05-20

It has not left my KP since I received it. Pictures are very sharp edge to edge at all focal lengths. I'm very pleased with how close it can focus so I can get relatively wide close up shots. Even at small apertures it is very sharp. The sundial in the photo was taken at f/16. It was cropped to 8x10 plus a minimal additional crop. This object is 2 1/2 in diameter. Not sure about hello kitty settings (forgive me for the subject matter )

excellent and economical

By Richard
Rated 5 out of 5
Date: 2021-05-20

Pentax recently dropped the price for this lens and as such, it is now a very good and economical choice as a mainstay lens. The optics are excellent, the weight is good, even though it is metal ( a good thing ) and it just works. If you wanted an alternate to the much more expensive DA* 16-50 lens and could accept the slightly reduced range of this lens, then this should be a top consideration.

Great lens thus far

By Timothy
Rated 5 out of 5
Date: 2021-05-12

I haven't used it extensively to date however soon as it came out of the box it was evident the build quality was second to none. The HD was evident with only a few pictures taken thus far. It was as if I had a polarizer filter on, and the sky in the background looked great. I will be looking to get the 15mm limited next.

Perfect backyard lens

By Jonathan D
Rated 5 out of 5
Date: 2021-09-06

Purchased this with for a K-70 (I'm an amateur / dad photographer). Really love this lens. Zoom and aperture are great for both portraits and group shots. Perfect for group settings -- the perfect lens for get togethers like backyard BBQs. I added a UV filter to make wiping off the end easy which worked out well when I had a splattering of rain interrupt my afternoon. Quality of build it great as well. This lens will be in my kit for awhile.

DA 20-40 Replaces Sigma 17-70 DC for use Pentax KP

By Stephen
Rated 5 out of 5
Date: 2021-08-11

Have been looking for lens to replace the Sigma whos only fault was poor balance on the KP. Plus I had the urge to at least own one limited in my lifetime. Build quality of the lens is on par with the old screw mount Super Takamers for those of us old enough to remember the good old days. When no plastics was used in lens construction. So far optical quality on this lens is superb, and beats the Sigma in the common range in my opinion. The Sigma still has a home on my K20. So far I.ve found that the focal length markings are quite accurate. This at this point is a partial review and basic impressions. Will follow up later after I put some time in the field.

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