Sony
Sony Alpha a6400 compact mirrorless camera black with 16-50mm and 55-210mm lenses 32GB
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PENTAX
PENTAX HD DA 20-40mm f/2.8-4 ED Limited DC WR Lens Black camera lens
Versatile 20-40mm zoom for APS-C K-mount cameras with ED glass and HD coating, covering wide-angle to portrait focal lengths in a compact 283g design
- Exceptional clarity with ED glass minimizing chromatic aberration
- Versatile 20-40mm zoom covering wide-angle to portrait
- Beautiful background blur at f/2.8-4 maximum aperture
- Compact 283g design ideal for travel and daily use
- Weather-resistant construction for reliable outdoor shooting
Versatile 20-40mm Zoom for K-mount APS-C
This Pentax HD DA 20-40mm f/2.8-4 ED Limited DC WR lens is designed specifically for K-mount APS-C cameras. It covers a useful wide-angle to standard focal range, equivalent to 30.5-61.5mm in 35mm format. Photographers gain the flexibility of landscape and portrait perspectives in a single compact optic. It suits enthusiasts who want high-quality imaging without carrying multiple primes.
ED Glass and HD Coating Control Aberrations
The optical design incorporates ED (Extra-low Dispersion) and super-low dispersion glass elements to minimise chromatic aberration. Pentax-developed HD coating suppresses flare and ghosting for high-contrast results. This combination delivers clear, high-resolution images with edge-to-edge sharpness across the zoom range. It is the specification that determines whether the lens meets your image-quality requirements.
Lightweight Build with Weather Resistance
Weighing only 283g, the lens is built for comfortable all-day carrying and travel use. The DC WR designation confirms a built-in DC motor for autofocus and weather-resistant construction. Seals help protect against dust and moisture during outdoor shooting. Normal operation remains quiet and balanced on compatible APS-C bodies.
Highlights
- Exceptional clarity with ED glass minimizing chromatic aberration
- Versatile 20-40mm zoom covering wide-angle to portrait
- Beautiful background blur at f/2.8-4 maximum aperture
- Compact 283g design ideal for travel and daily use
- Weather-resistant construction for reliable outdoor shooting
Specifications
No published specifications for this item yet.
Questions about this item
How wide and how tight does the 20-40mm zoom go on an APS-C body?
On APS-C the lens covers 20-40mm, which equals a 30.5-61.5mm full-frame view — wide enough for landscapes and long enough for portraits.
What does the f/2.8-4 aperture range mean for exposure and depth of field?
The maximum aperture opens to f/2.8 at 20mm and narrows to f/4 at 40mm, so low-light capability and background blur decrease slightly as you zoom in.
Will this lens fit my Pentax K-mount camera and how heavy is it?
It mounts directly on any Pentax K-mount APS-C body and weighs 283 g (10 oz), making it light enough for all-day carry.
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