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Lenses » 645 Mount » Pentax 25mm f4 SDM DA 645 Mount Lens

Pentax 25mm f4 SDM DA 645 Mount Lens

Price: £3599.00
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Pentax 25mm f4 SDM DA 645 Mount Lens



The Pentax 25mm f4 SDM DA 645 is an ultra-wide-angle lens with 645 Mount specifically for use with the Pentax 645D medium format digital camera. The lens offers a focal length of 19.5mm in the 35mm format, providing the widest perspective of all Pentax 645 interchangeable lenses. The lens is ideal for exaggerating perspectives and creating unique, wide-angle images and suitable for a variety of topics, including landscapes, architectural work, group shots, and indoor shooting with a confined space. With a dustproof, water-resistant construction, this 25mm f4 lens features two high-performance aspherical optical elements, Aero Bright Coating and Pentax’s advanced Supersonic Direct-drive Motor (SDM) autofocus mechanism to ensure outstanding image quality and smooth, quiet autofocus operation. 

Key Features

  • High performance wide angle 645 lens
  • Weather and dust sealed construction for safe and reliable operation in the field
  • Pentax Quick Shift focus system disengages AF motor for instant auto to manual focus switching
  • Aero Bright coating minimizes aberrations while maximising light transmission
  • Focal length equivalent to 19.5mm (in 35mm format) when used with Pentax 645D body (95 degree angle of view)
  • Inline filter tray for 40.5mm filter (lens curvature prevents front mounted filters)
  • Pentax SDM autofocus system for accurate, quiet autofocus performance
  • Rounded aperture blades for beautiful bokeh at open apertures
  • Pentax SP coating protects the lens from dust and oils making it easier to clean
  • Developed specifically for the Pentax 645 digital system

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 
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 effectively reduces lens reflectance and greatly increases 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 smooth, quiet autofocus operation.

Other features


  • Image circle covering all of the image area of 645-format film SLR cameras
  • High-quality machined aluminium parts, including the lens barrel, hood and cap
  • 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 (Super Protect) coating applied to the front surface of the lens to effectively repel dust, water and grease


Focal length - wide (mm) 25
Focal length - tele (mm) 25
Max aperture - wide 4.0
Max aperture - tele 4.0
Lens mount 645 AF2
Sensor format Medium Format
Filter thread (mm) 40.5
Minimum focus distance (m) 0.89
Weight (g) 1040
Size 90 x 148.5 mm
Colour Black
Included accessories Lens Hood : Built-in, Lens case S100-200, Special metal front cover cap, Rear lens cap, 2 exclusive filters (Normal and C-PL)
Minimum aperture 32
Lens elements 12
Lens groups 8
Aperture blades 9
Manufacturers link Click here




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