Pentax HD DA 20-40mm f2.8-4.0 ED Wide Angle Lens - Black

PentaxSKU: 27075274747

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Sale price£599.00 Regular price£719.00

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Product Description

Pentax HD DA 20-40mm f2.8-4.0 ED Wide Angle Lens - Black

  • HD coating
  • Circular aperture
  • Special low dispersion/abnormal low dispersion glass
  • In-lens motor AF
  • Drip-proof structure
  • Machined aluminium

This model is the first zoom lens of the high-grade Limited Lens series, which is renowned for its exceptional visual description, distinctive appearance and meticulous finish in every detail. It features a two-times zoom range covering focal lengths from moderate wide-angle to standard, and a large maximum aperture of F2.8 at its wide-angle end. In addition to the state-of-the-art HD coating and a completely round-shaped diaphragm, it also comes equipped with a weather-resistant construction for the first time in the Limited Lens series, and a smooth, quiet AF system driven by a lens-installed AF motor, to capture beautiful, high-quality images, even under demanding weather and environmental conditions.



With its two-times zoom coverage from 20mm to 40mm, this lens offers focal-length coverage from 30.5mm to 61.5mm (in the 35mm format) when mounted on a PENTAX K-series lens-interchangeable digital cameras body. It provides the most frequently used focal lengths required for many popular applications, such as scenic photography, snapshots and portraiture, making it the ideal choice as an all-purpose, everyday lens.

Inheriting the design concept of the Limited Lens series, this lens is designed with an optical construction that faithfully reproduces the feeling of depth while minimising astigmatism over the entire zoom range. It allows the photographer to optimise the subject's visual description, by making its appearance softer at larger apertures and sharper at smaller apertures. Its lens barrel, hood and cap are made of high-grade aluminium material and hand-machined for perfect proportions and beautiful texture. Positioned in the mid-section of the lens barrel, the zoom ring features a series of knurled grooves to facilitate zooming operation.



The lens has been treated with the PENTAX-developed HD coating, a high-grade, multi-layer coating that reduces reflectance in the visible light spectrum to less than 50 percent of that of conventional multi-layer coatings. This allows the user to capture crisp, high-contrast images free of flare and ghost images, even under such adverse lighting conditions as backlight. It also incorporates an ED (Extra-low Dispersion) glass and a super-low-dispersion glass element in its optics to deliver clear, high-resolution images with edge-to-edge sharpness, while effectively compensating for chromatic aberrations over the entire zoom range.

This lens is the first Limited Lens-series model to feature a weather-resistant construction, with seven special seals to prevent the intrusion of water and moisture into the lens interior. By mounting it on a PENTAX weather-resistant digital SLR camera body, the user is assured of greater durability and reliability when shooting in the rain or mist, as well as at locations subject to spray or splashes.

https://cdn.shopify.com/s/files/1/0554/9657/3025/files/2560px-Pentax_Logo.svg?v=1673009353
Ареrturе Вlаdеѕ 9
Аutоfосuѕ Моtоr Yеѕ
Соlоur Вlасk
Fіltеr Тhrеаd [mm] 55
Fосаl Lеngth ~ Теlе [mm] 40
Fосаl Lеngth ~ Wіdе [mm] 20
Нооd Моdеl МН-RА55
Іnсludеd Ассеѕѕоrіеѕ

Lеnѕ hооd МН-RА55, Lеnѕ сар О-LW65А, Lеnѕ mоunt сар, Lеnѕ ѕоft саѕе Р70-150

Lеnѕ Еlеmеntѕ 9
Lеnѕ Grоuрѕ 8
Lеnѕ Моunt Реntах К
Lеnѕ Туре

Ѕtаndаrd Zооm

Мах Ареrturе ~ Теlе 4
Мах Ареrturе ~ Wіdе 2.8
Махіmum Fоrmаt Ѕіzе АРЅ-С
Міnіmum Ареrturе 32
Міnіmum Fосuѕ Dіѕtаnсе [m] 0.28
Ѕіzе 71 х 68.5 mm
Wеіght [g] 283

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Understanding: Aperture

Aperture is the opening in a camera lens that controls how much light enters the camera. It's measured in f-stops like f/2.8 or f/8. Lower f-stop numbers mean wider openings, letting in more light and creating a shallow depth of field (blurry background). Higher f-stop numbers mean smaller openings, letting in less light and creating a larger depth of field (more of the scene in focus). Aperture also affects the quality of out-of-focus areas in the image (bokeh).

Understanding: Lens Types

Different lenses have different purposes to achieve different styles of images, some popular ones include:
Prime Lens: Fixed focal length, sharp images, great for portraits and dark settings.
Zoom Lens: Variable focal length, versatile for different shots and everyday use..
Wide-Angle Lens: Captures wide scenes like landscapes.
Telephoto Lens: Magnifies distant subjects, ideal for sports & wildlife.
Macro Lens: Perfect for close-up photography of small subjects.
Fisheye Lens: Ultra-wide perspective, creates unique images.

Understanding: Lens Mounts

Different camera brands use different lens mounts, which are like connectors that attach lenses to camera bodies. Each mount is specific to a particular brand and camera series. For example, Canon uses the EF and RF mounts, Nikon uses the F mount, Sony uses the E mount for its mirrorless cameras. These mounts dictate which lenses are compatible with which cameras. Some brands offer adapters to use lenses from other systems, but it's essential to ensure compatibility for proper functionality and autofocus performance.

Understanding: Manual and Autofocus

Manual focus and autofocus are two ways to adjust the sharpness of a camera lens. With manual focus, you turn a ring on the lens to bring the subject into focus yourself, giving you full control over what appears sharp in the image. Autofocus, on the other hand, relies on the camera's built-in technology to automatically adjust the focus for you, usually by detecting contrast or phase differences in the scene. Autofocus can be convenient, especially for fast-moving subjects or when you need to capture a quick shot, whereas manual focus allows for precise adjustments and creative control over the final image.

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