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Pentax HD -DA 20-40mm F2.8-4 ED Limited DC WR Review

HD Pentax-DA 20-40mm F2.8-4 ED Limited DC WR

Main Features

  • 20-40mm Focal Range
  • F2.8 - F4.0 Max Aperture
  • Weather Sealed
  • Filter Thread: 55mm
  • Max Format: APS-C / DX
  • Pentax KAF3 Mount
  • Weight: 283g.
  • Diameter: 71mm
  • Length: 69mm
  • Min Focus Distance:0.28m
  • Max Magnification:0.2x
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Pentax DA 20-40mm F2.8-4 ED DC WR Overview

Pentax DA 20-40mm F2.8-4 ED DC WR is an Auto Focus (AF) Standard Zoom lens with APS-C / DX max sensor coverage and it is designed to be used with Pentax KAF3 mount cameras.

Lens Mount

Pentax DA 20-40mm F2.8-4 ED DC WR is compatible with cameras that have Pentax KAF3 lens mount. Some of the latest released cameras that are compatible with the Pentax KAF3 lenses are , and .

Focal Range

Pentax DA 20-40mm F2.8-4 ED DC WR has a focal range of 20-40mm and 2.0X zoom ratio which has a 35mm equivalent focal range of 30-60mm when used on a APS-C / DX format camera.


Weather Sealings

Pentax DA 20-40mm F2.8-4 ED DC WR is a weather sealed lens which provides an extra protection to prevent water and dust get inside the lens and camera body under light rain, snow and wind. In order to have an effective protection, you have to pair the Pentax DA 20-40mm F2.8-4 ED DC WR with a weather sealed camera body such as , and .

Optical Image Stabilization

Pentax DA 20-40mm F2.8-4 ED DC WR doesn't have an optical image stabilization system so the only option to stabilize the image taken with this lens is to mount on a camera body with IBIS (sensor based In-body image stabilization).

Zoom Method

Pentax DA 20-40mm F2.8-4 ED DC WR features Rotary (extending) zoom method where the length of the lens changes as you zoom in or out. This makes it possible to design the lens with a smaller minimum length ( generally when it is zoomed out) compared to internal zoom lenses. The disadvantages of this design are being harder to seal against dust and moisture, weight balance shifting while zooming and zoom creep in certain lenses.

Maximum Magnification Ratio

Pentax DA 20-40mm F2.8-4 ED DC WR has a Max Magnification Ratio of 0.2x and has a minimum focusing distance of 0.28m.

Aperture

Pentax DA 20-40mm F2.8-4 ED DC WR is a variable aperture lens with a max aperture of f2.8 and a minimum aperture of f22 at 20mm, and a max aperture of f4 and minimum aperture of f32 at 40mm .

Optical Formula

Pentax DA 20-40mm F2.8-4 ED DC WR's optical formula consists of 9 elements in 8 groups . Following special elements are used in this design:

  • 1 ED glass element
  • 1 SLD glass element
  • HD coating

Lens Hood

Pentax DA 20-40mm F2.8-4 ED DC WR comes with a removable lens hood which is handy to reduce lens flare and glare in your photos. The model number of the hood is MH-RA55.

Body Colour

Pentax DA 20-40mm F2.8-4 ED DC WR is available in Black and silver color.

Popular Comparisons of Pentax DA 20-40mm F2.8-4 ED DC WR

Here is the eight most popular comparisons of Pentax DA 20-40mm F2.8-4 ED DC WR amongst Camera Decision readers.

Top Alternatives of Pentax DA 20-40mm F2.8-4 ED DC WR Lens
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APS-C / DX 395gr AF Amazon B&H Photo
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APS-C / DX 430gr AF Amazon B&H Photo
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35mm FF 790gr AF Amazon B&H Photo

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**This post contains affiliate links and I will be compensated if you make a purchase after clicking through my links. As an Amazon Associate I earn from qualifying purchases.

Pros and Cons of HD Pentax-DA 20-40mm F2.8-4 ED Limited DC WR


PROs
Weather Sealed
Built-in Autofocus
Hood supplied
Full-time Manual Focusing
Fast and Bright at Wide end
Fast and Bright at Tele end

CONs
Lens Extents while focusing
Variable Aperture

Pentax DA 20-40mm F2.8-4 ED DC WR Detailed Specifications


General
Brand Pentax
Lens Type Zoom
Lens Type Standard Zoom
Lens Mount Pentax KAF3
Max Format APS-C / DX
Focal Range 20-40mm
Image Stabilization No
Colour Black, silver
Zoom Method Rotary (extending)
Power Zoom No Zoom
Zoom Lock No Zoom
Zoom Ratio 2.0X
APERTURE
Max Aperture F2.8 - F4.0
Min Aperture F22.0 - F32.0
Aperture Ring No
Diaphragm Blades 9
Optics
Optical Elements 9
Optical Groups 8
Special Elements 1 ED glass element, 1 SLD glass element, HD coating

FOCUSING
Min Focus Distance 0.28m
Max Magnification 0.2X
Autofocus Yes
AF Motor Type Micromotor
Full Time Manual Yes
Focus Method Unknown
Distance Scale Yes
DoF Scale Yes
PHYSICAL SPECS
Weight 283g
Diameter 71mm
Length 69mm
Materials Aluminium barrel
Weather Sealing Yes
Filter Thread 55mm
Filter Notes -
Hood Supplied Yes
Hood Code MH-RA55
Tripod Collar No
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Frequently Asked Questions about HD Pentax-DA 20-40mm F2.8-4 ED Limited DC WR
is the HD Pentax-DA 20-40mm F2.8-4 ED Limited DC WR a Weather Sealed lens?
What is the Minimum Focusing Distance of HD Pentax-DA 20-40mm F2.8-4 ED Limited DC WR
is the HD Pentax-DA 20-40mm F2.8-4 ED Limited DC WR an Autofocus (AF) lens?
What is the Filter Thread Size of HD Pentax-DA 20-40mm F2.8-4 ED Limited DC WR
Does HD Pentax-DA 20-40mm F2.8-4 ED Limited DC WR have Image Stabilization?
Does HD Pentax-DA 20-40mm F2.8-4 ED Limited DC WR have Aperture Ring?
What is the Maximum Magnification Ratio of HD Pentax-DA 20-40mm F2.8-4 ED Limited DC WR
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