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645D

Digital SLR Cameras: 645D

The 645D delivers super-high-resolution images - as impressive to discriminating professionals as those produced by larger, 8x10-format cameras
The 645D’s large 44x33mm CCD image sensor is the key
to realizing the high-quality,
true-to-life images that inspire every photographer

Image size is a very important factor in advanced photography: the larger the image size, the more faithfully the ambience and sense of depth can be described, resulting in color-rich, fine-detailed images. The 645D incorporates a large, high-performance CCD image sensor (approximately 1.7 times larger that that of 35mm-format models). Because of this, it provides superb image description, unmatched by 35mm-format photography, and gives a boost to the creative aspirations of all photographers.

Distinctive imaging characteristics different from those of 35mm format
Rich gradation, natural depth-of-fiend description at open aperture, and crisp image definition at smaller apertures. The large image circle and broad sensor plane of the medium-format image sensor assures these benefits — factors essential for producing super-high-quality, true-to-life images unrivaled by 35mm-format counterparts. In addition, since a medium-format lens has a longer focal length than a 35mm lens with the same angle of view, it offers a better description of plasticity and makes the subject stand out more sharply against beautifully obscured background.

 

40 effective megapixels deliver exceptional resolving power
to capture sharp images of minuscule subjects


Note: Even when taken at the same F5.6 aperture, the medium-format 645D offers more natural, true-to-life images. White petals, which can be easily overexposed, retain their subtle gradation, with the fringe of every petal sharply defined. The background has a beautiful bokeh effect (out-of-focus rendition), while every blossom seems to shoot out of the image, as if sending its sweet fragrance to viewers.
Thanks to its approximately 40 effective megapixels, the 645D delivers super-high-resolution images equal in quality to those captured by the high-end digital camera backs used at professional photo studios. Its resolving power is far superior to that of 35mm-format digital SLR cameras or film-format 645 cameras.* Even when printed on large-format papers (measuring as large as 420mm by 297mm), you are assured of high-density, true-to-life artwork. When printed on the larger papers (measuring as large as 1,189mm by 841mm) used for photo exhibitions, the difference in resolution becomes even more evident. Sharply defined details make your images more fascinating and inspiring.

* Based on PENTAX assessment standards (as of February 2010).

Low-pass-filter-less design
optimizes lens performance

While the low-pass filter (LPF) is effective in minimizing the adverse effects of false colors and moiré, it can cause a deterioration in image sharpness. Because the 645D was designed for the highest resolution in mind, it features an LPF-free CCD unit, which can optimize the resolving power of the lens and the image sensor without compromising the overall image resolution. Thanks to its super-high resolving power, the 645D delivers high-quality images so sharp and vivid that even every leaf of a tree in a scenic image stand out clearly and individually.

14-bit A/D converter and PRIME II imaging engine team up
to assure super-fine-gradation images
with faithful reproduction of light and color

The 645D’s high-performance 14-bit A/D converter converts the analog signals output by the CCD image sensor to data-rich, multi-gradation digital signals (with a maximum of 16,384 gradations), which are then forwarded to the PRIME II imaging engine. Thanks to its high-speed data-processing capacity and new algorithm, this high-performance imaging engine instantly processes as much as 40 megapixels of data to produce super-high-quality images, which are truly satisfying even to the most demanding photographers. This sophisticated imaging engine can even compensate lens aberrations for the photographer.

Versatile 645AF2 lens mount accepts a rich lineup of interchangeable lenses

The 645D features the new PENTAX 645AF2 lens mount, designed to accept a vast selection of smc PENTAX 645-series interchangeable lenses — from wide angle to telephoto — all of which offer exceptional image descriptive power. With an FA 645-series lens mounted, the 645D retains autofocus operation. The new D FA 645 series is designed to minimize flare and ghost images, while retaining the superb descriptive power of conventional 645-series lenses, to produce sharp, bright images even at edges.

Note: When a conventional 645-series lens is mounted on the 645D camera body, its angle of view becomes approximately 1.3 times wider than when mounted on a 645 film-format camera body, while its focal length becomes approximately 0.8 times shorter in terms of the 35mm format.

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