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Pentax HD DA 20-40mm f/2.8-4 ED DC WR Lens

The Pentax 20-40mm f/2.8-4 ED DC WR is a 20–40mm f/4 lens designed for Pentax K mount cameras. Check GearFocus for current availability, with buyer protection on every purchase.

Pentax HD DA 20-40mm f/2.8-4 ED DC WR Lens

Pentax HD DA 20-40mm f/2.8-4 ED DC WR Lens

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Lens Overview — Pentax 20-40mm f/2.8-4 ED DC WR

The Pentax HD DA 20-40mm f/2.8-4 ED DC WR is a zoom lens built for Pentax K-mount APS-C format cameras, covering a standard focal length range from 20mm to 40mm. With a maximum aperture that ranges from f/2.8 at the wide end to f/4 at the telephoto end, it offers solid light-gathering capability across its zoom range, making it a capable choice for everyday shooting scenarios. The lens accepts 55mm filters and weighs just 283g, making it a notably compact and lightweight option for photographers who prioritize portability without sacrificing versatility.

It supports both autofocus and manual focus operation, giving shooters flexibility depending on their shooting style or subject matter. Designed around the APS-C sensor format and compatible exclusively with the Pentax K mount system, this lens fits naturally into the Pentax DSLR ecosystem. The lens falls into the standard focal length range category, making it well-suited for a wide variety of subjects, from environmental portraits to street photography and travel.

At 283g with a 55mm filter thread, its compact footprint is one of its most practical attributes for photographers building a portable kit around a Pentax K-mount body.

Key Features — Pentax 20-40mm f/2.8-4 ED DC WR

20-40mm Zoom Range: Covers a versatile standard focal length range on APS-C, equivalent to roughly 31-62mm full-frame, suited for everyday, street, and travel photography.

f/2.8-4 Variable Aperture: Offers f/2.8 at the wide end for better low-light capability and subject separation when shooting at 20mm.

Weather-Resistant Construction: WR sealing protects against dust and moisture, allowing confident use in outdoor and unpredictable shooting conditions.

HD Lens Coating: Pentax's HD coating reduces flare and ghosting for improved contrast and clarity in high-contrast or backlit scenes.

DC Autofocus Motor: Built-in DC motor drives autofocus directly in the lens, enabling quiet and responsive AF on compatible Pentax K-mount bodies.

Compact 283g Build: At just 283g, this is one of the lightest zoom lenses in the Pentax lineup, making it well-suited for travel and all-day carry.

Lens Specifications — Pentax 20-40mm f/2.8-4 ED DC WR

Pentax 20-40mm f/2.8-4 ED DC WR full specifications
SpecDetail
Use CasesTravel
Lens TypeZoom
FormatAPS-C
Zoom/PrimeZoom
Focal Length20–40mm
Maximum Aperturef/4
Camera SystemDSLR
Lens MountPentax K
AutofocusYes
Focus TypeAuto, Manual
Image StabilizationNone
Filter Thread55mm

Description — Pentax 20-40mm f/2.8-4 ED DC WR

The Pentax HD DA 20-40mm f/2.8-4 ED DC WR is a Zoom lens designed for Pentax K-mount cameras using the APS-C sensor format. It spans a 20mm to 40mm focal length range, placing it firmly in the standard focal length category — ideal for everyday photography from wider environmental shots to more compressed standard perspectives. The maximum aperture opens to f/2.8 at the wide end and f/4 at the telephoto end, offering useful flexibility in varied lighting conditions.

Weighing just 283g and featuring a 55mm filter thread, this is a notably compact and portable zoom option for Pentax DSLR shooters. The lens supports both autofocus and manual focus, giving photographers control over their focus method depending on the situation. With no image stabilization on board, it is best paired with steady hands or a stabilized camera body.

Overall, this lens offers a practical and portable focal range for Pentax K-mount APS-C users looking for a lightweight standard zoom.

Pros — Pentax 20-40mm f/2.8-4 ED DC WR

  • ✓Lightweight at just 283g, making it easy to carry for extended shooting sessions
  • ✓Versatile 20-40mm zoom range covers standard focal lengths on APS-C format cameras
  • ✓Maximum aperture of f/2.8 at the wide end provides useful light-gathering capability

Cons — Pentax 20-40mm f/2.8-4 ED DC WR

  • ✗No image stabilization, which may be a drawback in low-light handheld situations
  • ✗Maximum aperture narrows to f/4 at the 40mm end, limiting subject separation at longer focal lengths
  • ✗APS-C-only lens format limits compatibility to crop-sensor Pentax K-mount bodies

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

Videos — Pentax 20-40mm f/2.8-4 ED DC WR

Pentax 20 40mm Limited Review — PHOTO UNIVERSE

Resources & Downloads — Pentax 20-40mm f/2.8-4 ED DC WR

Manuals & Guides

Frequently Asked Questions — Pentax 20-40mm f/2.8-4 ED DC WR

What cameras is this lens compatible with?+
The Pentax HD DA 20-40mm is designed for Pentax K-mount cameras with APS-C format sensors. It is classified as a DSLR lens within the Pentax K camera system.
Does this lens have image stabilization?+
No. The specifications confirm that image stabilization is listed as None for this lens. Photographers who need stabilization would need to rely on in-body stabilization if their camera body supports it.
What filter size does this lens use?+
The lens has a 55mm filter thread, which is a widely available and affordable size, making it easy to find compatible filters such as UV, polarizing, or ND options.
Does this lens support autofocus?+
Yes. The lens supports both autofocus and manual focus operation. The autofocus capability is confirmed in the specifications, giving users flexibility across different shooting situations.
How heavy is this lens?+
The Pentax HD DA 20-40mm weighs 283g, making it a lightweight option within the standard zoom category, well-suited for travel or everyday carry.

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