New DA 645 25mm f/4

Back23.03.2012

Designed for exclusive use with the PENTAX 645D, this unifocal, ultra-wide-angle lens not only features PENTAX-original optics optimized for high-quality digital photography to assure exceptional image-description performance, but also offers a dependable dustproof, weather-resistant construction for active outdoor photographers.

Major Features

Unifocal, ultra-wide-angle lens

When mounted on the PENTAX 645D medium-format digital SLR camera body, this ultra-wide-angle lens offers a focal length of approximately 19.5mm in the 35mm format, providing the widest perspective of all the lenses compatible with PENTAX 645D. Creating visual effects unique to ultra-wide-angle lenses — such as exaggerated perspective and extra-wide depth of field — it can be effectively used for a wide range of subjects and situations, including spectacular landscapes and indoor shooting in a confined space. It assures greater freedom and flexibility in the photography with the PENTAX 645D. 

State-of-the-art optics

Incorporating two high-performance aspherical optical elements in its optics, this ultra-wide-angle lens provides exceptional image-resolving power with outstanding brightness levels even at the edges, while compensating various aberrations to a minimum. All lens characteristics are optimized for digital photography: for instance, exclusive lens coatings are applied to optical elements, while anti-reflection materials are applied to the interior of the lens barrel. The result is a lens that brings out the full potential of the PENTAX 645D medium-format digital SLR camera.

Aero Bright Coating to dramatically improve transmittance

This lens is treated with PENTAX-original Aero Bright Coating, which assures an outstanding anti-reflection performance over a broader wavelength range to deliver images that are more brilliant and in higher quality than those produced by previous models. Born as the fruit of PENTAX’s advanced nanotechnology, this exclusive coating reduces lens reflectance and greatly improves light transmittance by forming a silica aerogel layer with uniform pores on the surface of optical elements.

Dependable dustproof, weather-resistant construction

As the newest model of the dependable AW (All Weather) series, the lens features a highly dependable dustproof, weather-resistant construction with 11 special seals to effectively prevent the intrusion of dust and water into the lens interior. By coupling this lens with the PENTAX 645D camera body, the user is assured of a durable, reliable digital imaging system that performs superbly in demanding outdoor settings — even in rain or mist, or at locations prone to water splashes or spray.

Mountable circular polarizing filter

The lens features a built-in, pull-out-type filter holder in its barrel. By placing the C-PL (circular polarizing) filter (40.5mm in diameter; included as an exclusive accessory) on this holder, the user can easily rotate the filter to obtain the desired polarizing effect.

Smooth, quiet SDM autofocus operation

Featuring an advanced SDM (Supersonic Direct-drive Motor) autofocus mechanism employing a supersonic motor installed inside the lens barrel, the lens assures a smooth, quiet autofocus operation.

Other features

• High-quality machined aluminum parts, including the lens barrel, hood and cap
• Built-in lens hood optimally shaped for the angle of view of this lens mounted on the PENTAX 645D camera body
• Quick-Shift Focus system for instant switching to manual-focus operation, after the subject is captured in focus by the AF system
• Rounded diaphragm to produce a smooth, beautiful “bokeh” (out-of-focus rendition), while minimizing the streaking effect of point light sources
• SP (Special Protect) coating applied to the front surface of the lens to effectively repel dust, water and grease