The black HD Pentax DA 20-40mm f/2.8-4 ED Limited DC WR Lens from Pentax 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.

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

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.

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.

Shoot discreetly with in-lens, direct current (DC) Auto Focus motor operation for smooth & quiet performance.

The Quick-Shift Focus System allows instant switching from autofocus to manual focus operation.

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.

The PENTAX SP (Super Protect) coating on the front and rear lens elements repels dust, water and grease to keep your lens clean and your images sharp.

The ED (Extra-low Dispersion) glass and a super-low dispersion glass element in this lens' optics deliver clear, high resolution imagery with edge-to-edge sharpness, throughout the entire zoom range.

Enhanced with a rounded nine-blade diaphragm at the wide apertures for optimal optical performance and gorgeous bokeh effects.

Related Questions and Answers

Q: 1. compatible with Pentax KP?

A: Yes

Q: 2. What is this lens' build quality? Made of plastic or metal?

A: All the Pentax limiteds are beautifully built, all metal, and a joy to handle. I have owned all of them, and think the 20-40 zoom is the most satisfying tactile experience of them all.

Q: 3. compatible with k-5iis?

A: Yes, works with all K-5 models.

Q: 4. Can I still put a 55mm filter and attach the lens hood that comes with it?

A: Yes you can attach a 55mm threaded filter to the Pentax HD Pentax DA 20-40mm f/2.8-4 ED Limited DC WR Lens (Black) and the hood it comes with. But only if the filter has 55mm front threads to attach the hood too.

Q: 5. I see this is for a mirrorless camera, but a KAF mount. Will it work with my K-3II? Thanks Jeremy

A: Unfortunately this lens is only designed to work on the Pentax K-01 mirrorless camera.

Q: 6. I already own the Ltd's-DA15, DA21, &DA40-realistically will this replace could this replace those lenses?

A: This is a nice versatile lens , I don't think it should replace fixed lenses

Q: 7. Can you use this lens on the full frame K1? Will it have a 20mm-40mm focal length?

A: The Pentax DA 20-40mm F/2.8-4 ED is designed for crop sensor cameras and would vignette when used on full frame sensor camera such as the K1.

Q: 8. What is the clip-on cap size when using the hood? Want to replace the push-on cap.

A: The only caps we have for the Pentax HD Pentax DA 20-40mm f/2.8-4 ED Limited DC WR Lens (Black) fit on the lens not the hood. Like these, https://bhpho.to/43YMlhm .

Q: 9. will it work as a full frame on the new Pentax k1?

A: The Pentax HD Pentax DA 40mm f/2.8 Limited Lens is designed for use on APS-C sensor cameras; however, many owners and users of the lens have often stated that they happily use this lens on their Pentax 35mm film cameras and the lens does cover the full image frame. As such, the lens should also work for use on the full-frame Pentax K-1 DSLR camera. (Do note this claim has only been made about the Pentax HD Pentax DA 40mm f/2.8 Limited Lens, and does not apply to other Pentax DA Limited lenses).

Q: 10. Does this lens come with front and rear caps for storage protection?

A: The Pentax HD Pentax DA 35mm f/2.8 Macro Limited Lens (Black) includes front and rear lens caps.