Pentax 645D

Medium format AF digital SLR camera

Production details

Production details
Announced:March 2010
Production type:Mass production
System: Pentax 645 (1984)

Specification

Imaging plane
Maximum format:Medium format 44x33
Mount and Flange focal distance:Pentax 645 [70.87mm]
Imaging plane:44 × 33mm CCD sensor
Resolution:7264 × 5440 - 40 MP
Shutter
Type:Focal-plane
Model:Electronically controlled
Speeds:30 - 1/4000 + B
Sensor-shift image stabilization:-
Exposure
Exposure metering:Through-the-lens (TTL)
Exposure modes:Programmed Auto
Aperture-priority Auto
Shutter-priority Auto
Manual
Physical characteristics
Weight:1400g
Dimensions:156x117x119mm

Manufacturer description #1

March 10, 2010 - HOYA CORPORATION PENTAX Products is pleased to announce the launch of the PENTAX 645D lens-interchangeable, medium-format digital SLR camera. Thanks to the incorporation of a large image sensor, equal in performance to professional-standard digital camera backs, this high-performance model delivers super-high-resolution images with approximately 40 effective megapixels. It also offers outstanding dependability and superb operability and maneuverability to make outdoor shooting effortless and comfortable for demanding photographers.

The PENTAX 645D has been developed to provide super-high-resolution images produced by large image sensors — something previously available only on professional models — to serious landscape and outdoor photographers. It combines exceptional image quality with excellent maneuverability and outstanding reliability to simplify professional-level outdoor shooting. Thanks to the incorporation of a large, high-performance image sensor (measuring 44mm by 33mm) and PENTAX-original image-processing technology, it produces extra-sharp, super-high-resolution images with approximately 40 effective megapixels. It features remarkable durability and dependability, thanks to its lightweight but solidly built body featuring a magnesium-steel-alloy frame, reinforced glass LCD panel protectors and a reliable dustproof, weather-resistant construction. In addition, it is designed to be compatible with the majority of the existing PENTAX 645 system, so that current PENTAX 645-series camera users can take advantage of their valuable assets, including high-performance smc PENTAX 645 interchangeable lenses.

Major Features

1. Unprecedented image quality

i. Super-high-resolution images made possible by approximately 40 effective megapixels

The PENTAX 645D incorporates a high-performance CCD image sensor produced by Kodak. It measures 44mm by 33mm, and is approximately 1.7 times larger than its 35mm-format counterparts. Thanks to approximately 40 effective megapixels, it assures a wide dynamic range to faithfully reproduce the prevailing ambience and the sense of depth in super-high-resolution images that are rich in gradation and truthful in texture description. In order to bring out the full potential of the lens and the image sensor and assure the highest level of image-resolving power, the CCD unit is designed with no low-pass filters.

ii. High-performance, high-speed PRIME II imaging engine

The PENTAX 645D features the acclaimed, PENTAX-original PRIME (PENTAX Real Image Engine) II as its imaging engine. Thanks to its high-speed data-processing capacity and new algorithm exclusively programmed for medium-format digital SLR cameras, this high-performance imaging engine produces super-high-quality images rich in gradation and faithful in color reproduction, while allowing speedy data transmission of large-volume image data — even RAW-format images as large as some 50MB per file.

iii. 14-bit A/D converter for faithful conversion of image data to digital signals

The PENTAX 645D features a high-performance A/D converter, which faithfully converts the large volume of analog image data output by the large CCD image sensor to digital signals carrying an extensive amount of image data, including resolution and gradation.

2. Solid, maneuverable body

The PENTAX 645D’s main frame is made of lightweight but strong magnesium-steel alloy, while the chassis is made of diecast aluminum to minimize the expansion and extension caused by heat and also to optimize kinematic accuracy and thermal stability. The LCD panels — one on the camera’s top panel, another on the back panel — are covered with tempered glass plates for extra protection. The PENTAX 645D’s body is also designed to be a compact and highly maneuverable medium-format camera, despite the incorporation of such dependable features as a dust-proof, weather-resistant construction with 70 special seals, outstanding cold-resistant performance to assure solid operation at a temperature as low as –10°C, and a newly designed shutter unit with a top shutter speed of 1/4000 second that can withstand as many as 50,000 shutter releases.

3. Dual SD/SDHC memory card slots

The PENTAX 645D has a pair of memory card slots for the recording of images on both SD and SDHC memory cards. This dual-slot design gives the photographer extra data-storage options: for instance, recorded images can be assigned to different cards according to recording format (such as RAW or JPEG), or one of the cards can be used as the backup of the other. The settings for each memory card slot can be easily made by dedicated button.

4. Dependable DR II mechanism to minimize dust spots

The PENTAX 645D comes equipped with the highly dependable DR (Dust Removal) II mechanism, which effectively minimizes annoying dust spots on recorded images, even when the lenses are changed in dust-prone outdoor settings. By shifting UV/IR-cut filters placed in front of the CCD image sensor at supersonic speed using a piezoelectric element, this mechanism effectively and efficiently shakes dust off the image sensor. Thanks to the user-friendly dust-alert system, the photographer can check at a quick glance for dust adhering to the image sensor prior to the actual shooting.

5. Newly designed, high-precision 11-point wide-frame AF sensor

The PENTAX 645D’s new SAFOX IX + wide-frame autofocus system features 11 sensor points (with nine cross-type sensors positioned in the middle) to assure the extra-high-precision focusing demanded of medium-format digital SLR cameras. To develop this sophisticated AF system, the entire optical system was redesigned, at the same time with the addition of the new functionality to analyze and make use of the light sources data in the field of view.

6. Advanced 77-segment multi-pattern metering

The PENTAX 645D employs a state-of-the-art, 77-segment multi-pattern metering system to assure super-high-accuracy light metering. The exposure accuracy is further enhanced by collecting such additional data as image orientation (horizontal or vertical) and the distance to and magnification of the subject using the sensors installed inside the camera body, with the obtained data incorporated into exposure calculations.

7. Large, easy-to-see optical viewfinder

Incorporated in the PENTAX 645D’s finder unit, a trapezoid-shaped glass prism not only assures an approximately 98% field of view, but also greatly contributes to the downsizing of the camera body. Coupled with a bright, easy-to-focus Natural-Bright-Matte focusing screen, the PENTAX 645D’s viewfinder offers a large, clear view of the subject.

8. Custom Image function to create desired visual effects with ease

The PENTAX 645D’s Custom Image function lets the user easily control an image’s finishing touches to more precisely reflect the user’s creative intentions, or to more faithfully reproduce the ambience of the scene. The user can select one of eight modes, including the new Reversal Film mode designed to create images with the colors that are typical of reversal film. In addition, all parameters — such as saturation, hue, contrast, sharpness, key, and highlight/shadow contrast — can be easily adjusted to desired levels, so that the photographer can shoot images with great ease.

9. Versatile, multi-mode exposure system for faithful reproduction of creative intentions

i. Hyper Program function

The PENTAX 645D's Hyper Program function allows the user to instantly switch from Programmed AE mode to Shutter- or Aperture-Priority AE mode with a simple turn of the electric dials positioned around the grip. A single push of the green button shifts the exposure mode back to the original Programmed AE mode.

ii. Hyper Manual function

When shooting in the Metered Manual mode, the PENTAX 645D's Hyper Manual mode lets the user to instantly set the proper exposure for the subject with a single push of the green button.

iii. Sensitivity-Priority mode

The unique Sensitivity-Priority (Sv) mode automatically selects the optimum combination of aperture and shutter speed for the user-selected sensitivity. The sensitivity can be shifted swiftly by electronic dial on the back panel. The variable amount of the ISO could be configured to either 1/2 or 1/3 steps per click.

iv. Shutter/Aperture-Priority mode

Taking full advantage of the unique capability of digital cameras for the automatic shifting of sensitivity at any time, the Shutter/Aperture-Priority (TAv) mode automatically selects the most appropriate sensitivity for the user-selected aperture/shutter-speed combination. It allows the user to effortlessly experiment with a greater range of photographic expressions.

10. Large, easy-to-view 3.0-inch LCD monitor with approximately 921,000 dots

Positioned on the camera’s back panel, a large 3.0-inch color LCD monitor with approximately 921,000 dots provides a clear, bright view of onscreen images and menus. Since its wide-view design allows quick, effortless confirmation of the monitor image from approximately 170 degrees both horizontally and vertically, the photographer has little difficulty shooting images from low and high angles. The LCD monitor is also treated with exclusive AR (Anti-Reflection) coating to minimize reflections on the screen, even in the outdoor locations under bright sunshine.

11. Long battery life

The PENTAX 645D is powered by a large-capacity, rechargeable lithium-ion battery, which can capture approximately 800 images* when fully charged.

* Under testing conditions prescribed by PENTAX, when using a rechargeable D-LI90 lithium-ion battery with no flash.

11. Other features

  1. HDR (high dynamic range) function to create one composite image with an extra-wide gradation range from three images with different exposures
  2. Dynamic-Range Expansion function to compensate for both whitewashed (excessively overexposed) and blacked-out (excessively underexposed) areas
  3. Digital Level function for easy checking of the image’s levels
  4. Automatic compensation of distortion and lateral chromatic aberration (available in combination with the D FA 645- and FA 645- series lenses)
  5. Versatile white-balance control system, including the CTE mode designed to emphasize the dominant color components of the captured images, which works especially well with such scene like sunset.
  6. Mirror shock/operation-noise reduction function to assure smooth, quiet operation of the mirror during shooting
  7. Attachment of copyright credits on recorded images
  8. Compatible with the SDM (Supersonic Direct-drive Motor) autofocus mechanism, designed to assure smooth, quiet operation using the supersonic motor installed inside SDM lenses
  9. HDMI terminal (for type C mini connectors) for high-resolution image data output
  10. User-friendly, color-classified control buttons/switches, based on the color universal design concept
  11. PENTAX Digital Camera Utility 4 software package, including a RAW-data processing application (based on the popular SILKYPIX RAW-data processing engine developed by Ichikawa Soft Laboratory) and browser application

Manufacturer description #2

The PENTAX 645D is the first digital medium-format camera developed by PENTAX. It is designed for versatile use and allows the image to incorporate exceptional quality previously reserved for fashion and advertising.

The 645D incorporates a large, high-performance, 40 megapixels CCD image sensor (33 x 44mm) approximately 2 times larger than that of 35mm-format models. Due to this, it provides superb image detail beyond your expectations and gives a boost to the creative aspirations of all photographers. It also features a rugged, weather-resistant construction, a large viewfinder and compatibility with a lens range of almost 20 models.

Thanks to its size, its manoeuvrability and outstanding reliability, outdoor photography is effortless and studio shooting easy. The 645D is designed for professionals as well as advanced amateurs.

The PENTAX 645D incorporates a high-performance CCD image sensor. It measures 33mm by 44mm, and is 1.7 times larger than 35mm format sensors and 3.9 times larger than APS-C sensors. Thanks to approximately 40 effective megapixels, it provides a wide dynamic range for faithful reproduction of the ambience and the sense of depth in super-high-resolution images that are rich in tonal gradation and accurate in texture detail. This 40 megapixel CCD sensor provides a top resolution of 7264 x 5440 pixels, which is ideal for ultra-high resolution imaging, exceptionally large printing applications, and outstanding cropping flexibility. The pictures reach a resolution of 7264 x 5440 pixels, which allows large poster size prints without loss of quality. They also have large tone range and colour space.

The PENTAX 645D features a high-performance A/D converter, which faithfully converts the large volume of analogue image data, output by the large CCD sensor (16384 levels), to digital files carrying an impressive amount of image data, including resolution and tonal gradation.

The PENTAX 645D features the acclaimed, PENTAX-original PRIME (PENTAX Real Image Engine) II as its imaging engine. Thanks to its high-speed data processing and new algorithm, exclusively programmed for medium-format digital SLR cameras, this high-performance imaging engine produces super- high quality images rich in tonal gradation and faithful colour reproduction, while allowing speedy data transmission. Even with RAW-format images as large as 50MB per file.

The sensor displays a remarkable dynamic and fully respects the delicacy of artificial light. Entire speed range (200-1000 standard ISO and from 100 up to 1600 in extended mode) can be used. With its excellent noise management, the grain remains under control even at ISO 1600.

The Pentax 645D is comfortable to use not only in studio with light controlled but also during externally with different light.

The PENTAX 645D is one of the few digital medium-format cameras to be protected against rain and dust. With its 70 weather-proof seals and outstanding cold-resistant performance, you can be sure of reliable operation even at a temperature as low as –10°C.

The PENTAX 645D’s main housing is made of lightweight but strong magnesium-steel alloy, while the chassis is made of die cast aluminium to minimize the expansion and distortion caused by heat and also to optimize kinematic accuracy and thermal stability.

The LCD panels, one on the camera’s top panel and second on the back panel, are covered with tempered glass for extra protection. One touch of the PENTAX 645D impresses with its sturdy construction.

The PENTAX 645D offers exceptional ergonomics. The grip provides comfortable handling and use, especially while shooting handheld.

The 645D has many easily accessible shortcut controls on the body. This allows access to different controls without need to access the menus. ISO sensitivity, bracketing, focusing, light measurement, flash, white balance, recording format, dual slot SD/SDHC/SDXC memory card selection. A truly comfortable luxury.

Incorporated into the PENTAX 645D’s viewfinder, a trapezoid-shaped glass prism not only assures a field of view of approximately 100%, but also greatly contributes to the compactness of the camera body. Coupled with a bright, easy- to-focus Natural-Bright-Matte focusing screen, the PENTAX 645D’s viewfinder offers a large, clear view of the subject.

Positioned on the camera’s rear panel, a large 3.0-inch colour LCD monitor with approximately 921,000 dots provides a clear, bright view of displayed images and menus. Its wide-view design allows quick, effortless confirmation of the displayed image from approximately 170 degrees both horizontally and vertically, meaning the photographer has little difficulty shooting images from low and high angles. The LCD monitor is also treated with an exclusive AR (Anti-Reflection) coating to minimize reflections on the screen, even in the outdoor locations and under bright sun light.

The 645D offers an intuitive interface with clear and comprehensive menus to easily configure settings on the body. Navigation throughout the menus is instantaneous and the image rotated automatically with rotation of the body. The PENTAX 645D has multiple exposure modes for faithful reproduction of creative intentions:

Hyper Program function allows the user to instantly switch from Programmed AE mode to Shutter- or Aperture-Priority AE mode Hyper Manual enables instant return back to auto mode when the camera is set on Manual mode with a single push on the green button.

  • Sensitivity-Priority mode
  • Shutter/Aperture-Priority mode
  • Manual mode

The PENTAX 645D’s new SAFOX IX+ wide frame autofocus system features 11 sensor points (nine cross- type sensors positioned in the middle) to ensure the extra-high-precision focusing demanded on medium-format cameras. To develop this sophisticated AF system, the entire optical system was redesigned with the simultaneous addition of the new functionality to analyse and make use of the light sources data in the field of view.

The PENTAX 645D employs a state-of-the-art, 77-segment multi-pattern metering system to ensure super-high- accuracy metering. The exposure accuracy is further enhanced by collecting such additional data as image orientation (horizontal or vertical) and the distance to and magnification of the subject, using the sensors installed inside the camera body. With the data obtained and incorporated into exposure calculations.

With the latest firmware 1.13, the 645D is compatible with all SDXC cards for faster transfer and a bigger writing capacity (>32 GB)

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35mm full frame

43.27 24 36
  • Dimensions: 36 × 24mm
  • Aspect ratio: 3:2
  • Diagonal: 43.27mm
  • Area: 864mm2

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Image stabilizer

A technology used for reducing or even eliminating the effects of camera shake. Gyro sensors inside the lens detect camera shake and pass the data to a microcomputer. Then an image stabilization group of elements controlled by the microcomputer moves inside the lens and compensates camera shake in order to keep the image static on the imaging sensor or film.

The technology allows to increase the shutter speed by several stops and shoot handheld in such lighting conditions and at such focal lengths where without image stabilizer you have to use tripod, decrease the shutter speed and/or increase the ISO setting which can lead to blurry and noisy images.

Original name

Lens name as indicated on the lens barrel (usually on the front ring). With lenses from film era, may vary slightly from batch to batch.

Format

Format refers to the shape and size of film or image sensor.

35mm is the common name of the 36x24mm film format or image sensor format. It has an aspect ratio of 3:2, and a diagonal measurement of approximately 43mm. The name originates with the total width of the 135 film which was the primary medium of the format prior to the invention of the full frame digital SLR. Historically the 35mm format was sometimes called small format to distinguish it from the medium and large formats.

APS-C is an image sensor format approximately equivalent in size to the film negatives of 25.1x16.7mm with an aspect ratio of 3:2.

Medium format is a film format or image sensor format larger than 36x24mm (35mm) but smaller than 4x5in (large format).

Angle of view

Angle of view describes the angular extent of a given scene that is imaged by a camera. It is used interchangeably with the more general term field of view.

As the focal length changes, the angle of view also changes. The shorter the focal length (eg 18mm), the wider the angle of view. Conversely, the longer the focal length (eg 55mm), the smaller the angle of view.

A camera's angle of view depends not only on the lens, but also on the sensor. Imaging sensors are sometimes smaller than 35mm film frame, and this causes the lens to have a narrower angle of view than with 35mm film, by a certain factor for each sensor (called the crop factor).

This website does not use the angles of view provided by lens manufacturers, but calculates them automatically by the following formula: 114.6 * arctan (21.622 / CF * FL),

where:

CF – crop-factor of a sensor,
FL – focal length of a lens.

Mount

A lens mount is an interface — mechanical and often also electrical — between a camera body and a lens.

A lens mount may be a screw-threaded type, a bayonet-type, or a breech-lock type. Modern camera lens mounts are of the bayonet type, because the bayonet mechanism precisely aligns mechanical and electrical features between lens and body, unlike screw-threaded mounts.

Lens mounts of competing manufacturers (Canon, Nikon, Pentax, Sony etc.) are always incompatible. In addition to the mechanical and electrical interface variations, the flange focal distance can also be different.

The flange focal distance (FFD) is the distance from the mechanical rear end surface of the lens mount to the focal plane.

Lens construction

Lens construction – a specific arrangement of elements and groups that make up the optical design, including type and size of elements, type of used materials etc.

Element - an individual piece of glass which makes up one component of a photographic lens. Photographic lenses are nearly always built up of multiple such elements.

Group – a cemented together pieces of glass which form a single unit or an individual piece of glass. The advantage is that there is no glass-air surfaces between cemented together pieces of glass, which reduces reflections.

Focal length

The focal length is the factor that determines the size of the image reproduced on the focal plane, picture angle which covers the area of the subject to be photographed, depth of field, etc.

Speed

The largest opening or stop at which a lens can be used is referred to as the speed of the lens. The larger the maximum aperture is, the faster the lens is considered to be. Lenses that offer a large maximum aperture are commonly referred to as fast lenses, and lenses with smaller maximum aperture are regarded as slow.

In low-light situations, having a wider maximum aperture means that you can shoot at a faster shutter speed or work at a lower ISO, or both.

Closest focusing distance

The minimum distance from the focal plane (film or sensor) to the subject where the lens is still able to focus.

Closest working distance

The distance from the front edge of the lens to the subject at the maximum magnification.

Magnification ratio

Determines how large the subject will appear in the final image. For example, a magnification ratio of 1:1 means that the image of the subject formed on the film or sensor will be the same size as the subject in real life. For this reason, a 1:1 ratio is often called "life-size".

Manual focus override in autofocus mode

Allows to perform final focusing manually after the camera has locked the focus automatically. Note that you don't have to switch camera and/or lens to manual focus mode.

Manual focus override in autofocus mode

Allows to perform final focusing manually after the camera has locked the focus automatically. Note that you don't have to switch camera and/or lens to manual focus mode.

Electronic manual focus override is performed in the following way: half-press the shutter button, wait until the camera has finished the autofocusing and then focus manually without releasing the shutter button using the focusing ring.

Manual diaphragm

The diaphragm must be stopped down manually by rotating the detent aperture ring.

Preset diaphragm

The lens has two rings, one is for pre-setting, while the other is for normal diaphragm adjustment. The first ring must be set at the desired aperture, the second ring then should be fully opened for focusing, and turned back for stop down to the pre-set value.

Semi-automatic diaphragm

The lens features spring mechanism in the diaphragm, triggered by the shutter release, which stops down the diaphragm to the pre-set value. The spring needs to be reset manually after each exposure to re-open diaphragm to its maximum value.

Automatic diaphragm

The camera automatically closes the diaphragm down during the shutter operation. On completion of the exposure, the diaphragm re-opens to its maximum value.

Fixed diaphragm

The aperture setting is fixed at F/ on this lens, and cannot be adjusted.

Number of blades

As a general rule, the more blades that are used to create the aperture opening in the lens, the rounder the out-of-focus highlights will be.

Some lenses are designed with curved diaphragm blades, so the roundness of the aperture comes not from the number of blades, but from their shape. However, the fewer blades the diaphragm has, the more difficult it is to form a circle, regardless of rounded edges.

At maximum aperture, the opening will be circular regardless of the number of blades.

Weight

Excluding case or pouch, caps and other detachable accessories (lens hood, close-up adapter, tripod adapter etc.).

Maximum diameter x Length

Excluding case or pouch, caps and other detachable accessories (lens hood, close-up adapter, tripod adapter etc.).

For lenses with collapsible design, the length is indicated for the working (retracted) state.

Weather sealing

A rubber material which is inserted in between each externally exposed part (manual focus and zoom rings, buttons, switch panels etc.) to ensure it is properly sealed against dust and moisture.

Lenses that accept front mounted filters typically do not have gaskets behind the filter mount. It is recommended to use a filter for complete weather resistance when desired.

Fluorine coating

Helps keep lenses clean by reducing the possibility of dust and dirt adhering to the lens and by facilitating cleaning should the need arise. Applied to the outer surface of the front and/or rear lens elements over multi-coatings.

Filters

Lens filters are accessories that can protect lenses from dirt and damage, enhance colors, minimize glare and reflections, and add creative effects to images.

Lens hood

A lens hood or lens shade is a device used on the end of a lens to block the sun or other light source in order to prevent glare and lens flare. Flare occurs when stray light strikes the front element of a lens and then bounces around within the lens. This stray light often comes from very bright light sources, such as the sun, bright studio lights, or a bright white background.

The geometry of the lens hood can vary from a plain cylindrical or conical section to a more complex shape, sometimes called a petal, tulip, or flower hood. This allows the lens hood to block stray light with the higher portions of the lens hood, while allowing more light into the corners of the image through the lowered portions of the hood.

Lens hoods are more prominent in long focus lenses because they have a smaller viewing angle than that of wide-angle lenses. For wide angle lenses, the length of the hood cannot be as long as those for telephoto lenses, as a longer hood would enter the wider field of view of the lens.

Lens hoods are often designed to fit onto the matching lens facing either forward, for normal use, or backwards, so that the hood may be stored with the lens without occupying much additional space. In addition, lens hoods can offer some degree of physical protection for the lens due to the hood extending farther than the lens itself.

Teleconverters

Teleconverters increase the effective focal length of lenses. They also usually maintain the closest focusing distance of lenses, thus increasing the magnification significantly. A lens combined with a teleconverter is normally smaller, lighter and cheaper than a "direct" telephoto lens of the same focal length and speed.

Teleconverters are a convenient way of enhancing telephoto capability, but it comes at a cost − reduced maximum aperture. Also, since teleconverters magnify every detail in the image, they logically also magnify residual aberrations of the lens.

Lens caps

Scratched lens surfaces can spoil the definition and contrast of even the finest lenses. Lens covers are the best and most inexpensive protection available against dust, moisture and abrasion. Safeguard lens elements - both front and rear - whenever the lens is not in use.