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
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Lens Overview — Pentax 20-40mm f/2.8-4 ED DC WR
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
| Spec | Detail |
|---|---|
| Use Cases | Travel |
| Lens Type | Zoom |
| Format | APS-C |
| Zoom/Prime | Zoom |
| Focal Length | 20–40mm |
| Maximum Aperture | f/4 |
| Camera System | DSLR |
| Lens Mount | Pentax K |
| Autofocus | Yes |
| Focus Type | Auto, Manual |
| Image Stabilization | None |
| Filter Thread | 55mm |
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
- Pentax 20-40mm F2.8-4 Limited Review: The coolest zoom lens
J Bradford Photo - HD Pentax-DA 20-40mm f/2.8-4 Limited DC WR Lens Review
ePHOTOzine - Pentax 20-40mm f/2.8-4 ED Limited DC WR HD DA Review
Imaging Resource - Pentax HD DA 20-40mm f2.8-4 ED Limited lens review: Prime performance in a zoom
DXOMark - My top 5 Pentax Lens
the CameraVille - What's the big deal with the Pentax 20-40mm Limited lens?
snappiness
Videos — Pentax 20-40mm f/2.8-4 ED DC WR
Pentax 20 40mm Limited Review — PHOTO UNIVERSE