HD PENTAX-D FA 70-210mm F4 ED SDM WR

A compact, lightweighted and weather-resistant telephoto zoom lens for use with 35mm-format full-frame digital SLR providing great poratability

Even though it has a highly portable design, this high-performance zoom lens covers a 35mm full-frame image circle. Its compact, lightweight, weather-resistant body lets users carry it anywhere with ease, and ecffortlessly capture high-quality images of a wide range of subjects, including landscapes, portraits, close-ups and sports events. Use of the high-grade, multi-layer HD Coating to the optics optimizes the overall lens coating performance, while assuring edge-to-edge sharpness and minimizing flare and ghost images in backlit situations. Thanks to a minimum focusing distance of 0.95 meters and a maximum magnification of 0.32 times, it provides a photographic coverage much wider than that of previous models.

Compact, lightweight telephoto zoom lens with outstanding portability

Despite its compact, lightweight design weighing approximately 819 grams, this zoom lens covers the image circle of 35mm full-frame digital SLRs, and provides a focal length range of 70mm to 210mm to facilitate handheld outdoor photography. When mounted on an APS-C-format camera, its focal length range is extended to the equivalent of 107mm to 322mm in the 35mm format. Coupled with its compact, lightweight body, it can be easily integrated in any APS-C-format camera system. 
The lens which allows the photographer to enjoy active field photography in a wide range of outdoor applications, including scenic photography, townscape shooting and wildlife photography where its outstanding portability really comes in handy.

Features 

Technologies supporting exceptional imaging performance

The lens construction, with a total of 20 elements in 14 groups, includes three ED (extra-low dispersion) glass elements and two anomalous dispersion glass elements. This reduces distortion, coma and chromatic aberration are compensated for and the conditions for high-contrast images with high resolution and sharpness all the way to the edge of the image. Thanks to internal focusing, the length of the lens barrel remains constant, which this makes handling much easier in many shooting situations.

This lens incorporates a Round-shaped, nine-blade diaphragm to produce a natural, beautiful bokeh (defocus) effect while minimizing the streaking effect of point light sources.

HD Coating to enhance imaging performance

The lens incorporates the PENTAX-developed, multi-layer HD (High Definition) Coating. Compared with conventional multi-layer coatings, it improves light transmittance while reducing average reflectance in the visible ray spectrum. This means that it can deliver clear, well-defined images with minimal flare and ghost images, even under demanding lighting conditions such as backlighting.

Minimum focusing distance of 0.95 meter

This lens can be used as a tele-macro lens as the minimum focusing distance of 0.95 meter has been achieved for both the tele and wide, with the maximum magnification, 0.32x. By using with APS-C the maximum magnification is 0.48x

Weather-resistant construction,  with  perfect for outdoor photography

This zoom lens features a weather-resistant construction to prevent the intrusion of water into the lens barrel. When mounted on a PENTAX weather-resistant digital SLR camera body, it assures a durable, reliable digital imaging system that performs superbly in demanding shooting settings — even in rain or mist, or at locations prone to water splashes or spray.

SP Coating

SP coating is a PENTAX-original special coating that provides superior performance in repelling water and oils. It is used on the front surface of the first high-performance lens for effective protection of the lens surface. This coating not only prevents adhesion of dust, water drops, oils, and other substances, but it also makes it easy to wipe off objects that adhere to the lens.

Comparison of dirt adhesion (oil-based ink) A lens surface treated with SP Coating has a very smooth surface without the adhesion of the oil-based ink.	Comparison of wipe-off (oil-based ink)  A lens surface treated with SP Coating can be wiped clean more easily and completely, even after the ink has dried.

Supersonic AF motor (SDM) Thanks to the incorporation of the PENTAX-original SDM autofocus system driven by a built-in supersonic motor, this zoom lens offers exceptionally smooth and quiet autofocus operation. When mounted on an SDM-compatible PENTAX K-mount lens-interchangeable digital camera body*, the focus mode is automatically switched to SDM-assisted autofocusing to ensure dependable, flawless AF operation.

 * This lens is compatible with the K-3 Mark III, K-3II, K-3, K-5 II, K-5 II s, K-30, K-01, K-5, K-r, K-7, K-x, K-m, K20D, K200D, K100D Super and K10D camera bodies (with Ver. 1.30 or later firmware installed).
When mounted on other camera bodies, the focus mode is automatically switched to manual.

Other features

Quick-Shift Focus System
After focusing using the autofocus, the focus ring can be turned to allow immediate focus adjustment using the manual focus.
This feature enables smooth operability by eliminating the need for an AF/MF switching operation. This is useful during closeup photography, for instance, when you want to shoot while making fine adjustments to the focus

Lens Hood  included
In addition to a variety of features, such as our unique multi-coating and the prevention of reflections in the lens barrel, a large special lens hood is included with this PENTAX lens to minimise ghosting and flare that occurs in backlit and other adverse conditions. As such, the lens hood is an integral part of the optical system and should always be used when using the lens. Most PENTAX lenses are designed so that the lens tip does not rotate when zooming and focusing to facilitate the use of circular polarising filters. This is further supported by a small window in the lower part of the aperture to allow the circular polarising filter to be operated.

PENTAX K Mount

The lens mounts for PENTAX interchangeable lenses are based on the bayonet K mount, which has remained unchanged since its inception in 1975. It is a mount unique to PENTAX that features a large aperture combined with superior ease of replacement, accuracy, and toughness. These features are utilized to comfortably incorporate an iris control mechanism, autofocus mechanism, and other functions for enabling nearly complete compatibility with conventional lenses. The PENTAX K Mount keeps its advanced versatility despite differences in camera and lens functions.

【MTF Chart】

Geometric optics MTF
(MTF calculated without referencing the effects of light diffraction phenomenon)

Wave optical MTF

(MTF calculated referencing the effects of light diffraction phenomenon)

MTF chart information

MTF (Modulation Transfer Function) is a kind of index used to evaluate lens performance, which represents the extent of subject contrast reproduction as spatial frequency.
The MTF chart here shows the contrast on the vertical axis, and distance from the center of the image on the horizontal axis. For the spatial frequency, 10 lines/mm shows a low frequency, and 30 lines/mm shows a high frequency, resulting in the MTF graph. On the graph, the solid line represents the S direction (sagittal direction and radiation direction) MTF, and the broken line represents the M direction (meridional direction and concentric circular direction) MTF.
In general, a low-frequency MTF is proof of a clear, high-contrast lens, and a high-frequency MTF is proof of a sharp lens with high resolving power.

 Sample Images

Aperture: F4.0, Shutter speed: 1/320sec, Exposure compensation: -0.3EV, Focal length: 210mm, White balance: Auto, ISO sensitivity: 400, Finishing touch/Custom image: Landscape, Captured by APS-C-size DSLR camera

Aperture: F6.3, Shutter speed: 1/250sec, Focal length: 210mm, White balance: Daylight, ISO sensitivity: 400, Finishing touch/Custom image: Flat　
Photo by YOSHIAKI KOBAYASHI 

Aperture: F11, Shutter speed: 1/4sec, Exposure compensation: -1EV, Focal length: 100mm, White balance: Daylight, ISO sensitivity: 100, Finishing touch/Custom image: Reversal Film　Photo by YOSHIAKI KOBAYASHI

Aperture: F5.6, Shutter speed: 1/250sec, Exposure compensation: -1EV, Focal length: 294mm, White balance: Auto, ISO sensitivity: 1600, Finishing touch/Custom image: Landscape, Captured by APS-C-size DSLR camera using AF Rear Converter 1.4ｘ

Aperture: F8.0, Shutter speed: 1/500sec, Focal length: 133mm, White balance: Auto, ISO sensitivity: 400, Finishing touch/Custom image: Landscape　Photo by KAZUTOSHI YOSHIMURA

Aperture: F5.0, Shutter speed: 1/400sec, Exposure compensation: +1.3EV, Focal length: 170mm, White balance: Daylight, ISO sensitivity: 1600, Finishing touch/Custom image: Bright　Photo by YOSHIAKI KOBAYASHI

Aperture: F11, Shutter speed: 1/4sec, Exposure compensation: -1.7EV, Focal length: 145mm, White balance: CTE, ISO sensitivity: 100, Finishing touch/Custom image: Flat　Photo by YOSHIAKI KOBAYASHI

Aperture: F11, Shutter speed: 1/2500sec, Focal length: 95mm, White balance: Daylight, ISO sensitivity: 200, Finishing touch/Custom image: Bright　Photo by YOSHIAKI KOBAYASHI, Captured by APS-C-size DSLR camera

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