Pentax-DA 20-40mm f/2.8-4 LTD S Lens

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Product Overview

  • 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
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Pentax-DA 20-40MM F2.8-4 LTD S Lens 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.


Key Features of the Pentax-DA 20-40MM F2.8-4 LTD S Lens

  • 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

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 and 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.


  • MPN - 23010
  • GTIN - 027075274754
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Brand Pentax
Focal Length 20 - 40mm
Comparable 35mm Focal Length: 30.5 - 61.5 mm
Focal Length 20 - 40mm; Comparable 35mm Focal Length: 30.5 - 61.5 mm
Aperture Range Maximum: f/2.8 - 4
Minimum: f/22 - 32
Aperture Maximum: f/2.8 - 4; Minimum: f/22 - 32
Camera Mount Pentax K
Camera Mount Type Pentax K
Format Compatibility Pentax Digital (APS-C)
Lens Format Pentax Digital (APS-C)
Angle of View 70 - 39
Minimum Focusing Distance 11.02“ (28 cm)
Tilt None
Focus Type Autofocus
Minimum Focus Distance 28 cm
Image Stabilizer No
Magnification 0.20x
Angle Of View 70 - 39
Elements/Groups 9/8
Groups 8
Diaphragm Blades 9
Diaphragm Blades 9
Image Stabilization No
Filter Size Front:55 mm
Autofocus Yes
Tripod Collar No
Tripod Collar No
Elements 9
Filter Thread Front:55 mm
Dimensions (Diam. x L) 71 x 69 mm
Dimensions (DxL) Approx. 2.80 x 2.72“ (71 x 69 mm)
Weight 283
Weight 283
Focal Length 20 to 40mm
Comparable 35mm Focal Length: 30.5 to 61.5 mm
Dimensions(DxL) 71 x 69 mm
Weight 283 g
Tilt/Shift None
Filter Thread Size Front: 55 mm
Tripod Collar No
Autofocus Yes
Aperture Maximum: f/2.8 to 4
Minimum: f/22 to 32
Camera Mount Type Pentax K
Format Compatibility Pentax Digital (APS-C)
Angle of View 70 to 39
Minimum Focus Distance 28 cm
Magnification 0.20x
Maximum Reproduction Ratio 1:5
Optical Design 9 Elements in 8 Groups
Diaphragm Blades 9
Image Stabilization No
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What’s In The Box
  • Pentax-DA 20-40mm f/2.8-4 LTD S Lens
  • Front Lens Cap 
  • Rear Lens Cap 
  • MH-RA55 Lens Hood
  • Lens Pouch 
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