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Pentax 645D Comparison Review

The Pentax 645D is a DSLR (Digital Single Lens Reflex) camera that was announced in March 2010 and is equipped with a medium format sensor. It offers a resolution of 39.5 megapixel.

Body comparison with a credit card

An illustration of the physical dimensions of the Pentax 645D vis-à-vis a credit card is provided in the side-by-side display below. Three consecutive perspectives from the front, the top, and the back are presented. All size dimensions are rounded to the nearest millimeter.

Pentax 645D vs credit card front
645D versus credit card top view
645D and credit card rear side

The table below summarizes the key physical specs of the Pentax 645D alongside a set of comparators. If you want to review a camera pair side-by-side, just select a right-side comparator from among the camera models in the table. Alternatively, you can also move across to the CAM-parator tool and choose from the broad selection of possible comparisons there.

Camera Body Specifications
Camera Camera
Width
Camera
Height
Camera
Depth
Camera
Weight
Battery
Life
(CIPA)
Weather
Sealing
(y/n)
Camera
Launch
(year)
Launch
Price
(USD)
Street
Price
(amazon)
Used
Price
(ebay)
Pentax 645D 156 mm 117 mm 119 mm 1480 g 800 YES 2010 9,995discont. check
Canon 1D X Mark II (⇒ lft | rgt) 158 mm 168 mm 83 mm 1530 g 1210 YES 2016 5,999 latest check
Canon 1D X (⇒ lft | rgt) 158 mm 168 mm 83 mm 1551 g 1120 YES 2011 6,799discont. check
Canon 1D Mark IV (⇒ lft | rgt) 156 mm 157 mm 80 mm 1230 g 1500 YES 2009 4,999discont. check
Leica S Typ 006 (⇒ lft | rgt) 160 mm 120 mm 80 mm 1260 g .. YES 2012 21,950discont. check
Nikon D850 (⇒ lft | rgt) 146 mm 124 mm 79 mm 1005 g 1840 YES 2017 3,299 latest check
Nikon D5 (⇒ lft | rgt) 160 mm 159 mm 92 mm 1415 g 3780 YES 2016 6,499 latest check
Nikon D810 (⇒ lft | rgt) 146 mm 123 mm 82 mm 980 g 1200 YES 2014 3,299discont. check
Nikon D3S (⇒ lft | rgt) 160 mm 157 mm 88 mm 1240 g 4200 YES 2009 5,199discont. check
Pentax 645Z (⇒ lft | rgt) 156 mm 117 mm 123 mm 1550 g 650 YES 2014 8,499 latest check
Sony A7R (⇒ lft | rgt) 127 mm 94 mm 48 mm 465 g 340 YES 2013 2,299discont. check

The listed prices provide an indication of the market segment that the manufacturer of the cameras have been targeting. The Pentax 645D was launched in the US market at a price of $9,995. Usually, retail prices stay at first close to the launch price, but after several months, discounts become available. Later in the product cycle and, in particular, when the replacement model is about to appear, further discounting and stock clearance sales often push the camera price considerably down. Then, after the new model is out, very good deals can frequently be found on the pre-owned market.

Sensor comparison with a 35mm slide

The size of the imaging sensor is a crucial determinant of image quality. All other things equal, a large sensor will have larger individual pixel-units that offer better low-light sensitivity, wider dynamic range, and richer color depth than smaller pixels in a sensor of the same technological generation. Moreover, a large sensor camera will give the photographer more control over depth-of-field in the image and, thus, the ability to better isolate a subject from the background. On the downside, larger sensors tend to be associated with larger, more expensive camera bodies and lenses.

The Pentax 645D features a medium format sensor and has a format factor (sometimes also referred to as "crop factor") of 0.79. Within the spectrum of camera sensors, this places the Pentax 645D among the large-sensor cameras that aim for top notch image quality.

Pentax 645D sensor measures
Sensor size

Since 2007, DXO Mark has published sensor performance measurements that have been derived using a consistent methodology. This service is based on lab testing and assigns an overall score to each camera sensor, as well as ratings for dynamic range ("DXO Landscape"), color depth ("DXO Portrait"), and low-light sensitivity ("DXO Sports"). The following table provides an overview of the physical sensor characteristics, as well as the sensor quality measurements for a selection of comparators.

Sensor Characteristics
Camera Sensor
Class
Resolution
(Megapixel)
Horiz.
Pixels
Vert.
Pixels
Video
Format
DXO
Portrait
DXO
Landscape
DXO
Sports
DXO
Overall
Pentax 645D Medium Format 39.5 7264 5440 no 24.6 12.6 1262 82
Canon 1D X Mark II (⇒ lft | rgt) Full Frame 20.0 5472 3648 4K/60p 24.1 13.5 3207 88
Canon 1D X (⇒ lft | rgt) Full Frame 17.9 5184 3456 1080/30p 23.8 11.8 2786 82
Canon 1D Mark IV (⇒ lft | rgt) APS-H 16.0 4896 3264 1080/30p 22.8 12.0 1320 74
Leica S Typ 006 (⇒ lft | rgt) Medium Format 37.5 7500 5000 no 23.9 12.2 824 76
Nikon D850 (⇒ lft | rgt) Full Frame 45.4 8256 5504 4K/30p 26.4 14.8 2660 100
Nikon D5 (⇒ lft | rgt) Full Frame 20.7 5588 3712 4K/30p 25.1 12.3 2343 88
Nikon D810 (⇒ lft | rgt) Full Frame 36.2 7360 4912 1080/60p 25.7 14.8 2853 97
Nikon D3S (⇒ lft | rgt) Full Frame 12.1 4256 2832 720/24p 23.5 12.0 3253 82
Pentax 645Z (⇒ lft | rgt) Medium Format 51.1 8256 6192 1080/60i 26.0 14.7 4505 101
Sony A7R (⇒ lft | rgt) Full Frame 36.2 7360 4912 1080/60p 25.6 14.1 2746 95

Feature comparison

Apart from body and sensor, cameras can and do differ across a variety of features. The following table reports on some other key feature differences and similarities of the Pentax 645D and comparable cameras. If you need more detail on the specs, you can find comprehensive listings, for example, in the dpreview camera hub.

Core Features
Camera Viewfinder
(Type or
'000 dots)
Control
Panel
(Y/n)
LCD
Size
(inch)
LCD
Resolution
('000 dots)
LCD
Attach-
ment
Touch
Screen
(Y/n)
Shutter
speed
(1/sec)
Shutter
flaps
(1/sec))
Build-in
Flash
(GN)
Build-in
Image
Stab
Pentax 645D optical YES 3.0 921 fixed no 4000 1.1 no no
Canon 1D X Mark II (⇒ lft | rgt) optical YES 3.2 1620 fixed YES 8000 16.0 no no
Canon 1D X (⇒ lft | rgt) optical YES 3.2 1040 fixed no 8000 14.0 no no
Canon 1D Mark IV (⇒ lft | rgt) optical YES 3.0 920 fixed no 8000 10.0 no no
Leica S Typ 006 (⇒ lft | rgt) optical YES 3.0 922 fixed no 4000 1.5 no no
Nikon D850 (⇒ lft | rgt) optical YES 3.2 2359 tilting YES 8000 9.0 no no
Nikon D5 (⇒ lft | rgt) optical YES 3.2 2359 fixed YES 8000 14.0 no no
Nikon D810 (⇒ lft | rgt) optical YES 3.2 1229 fixed no 4000 5.0 12 no
Nikon D3S (⇒ lft | rgt) optical YES 3.0 921 fixed no 8000 11.0 no no
Pentax 645Z (⇒ lft | rgt) optical YES 3.2 1037 tilting no 4000 3.0 no no
Sony A7R (⇒ lft | rgt) 2400 no 3.0 1230 tilting no 8000 4.0 no no

Expert reviews

While the comparison of technical specifications can provide a useful overview of the capabilities of different cameras, it says nothing about, for example, the handling, responsiveness, and overall imaging quality of the 645D in practical situations. User reviews that are available, for instance, at amazon can sometimes shed light on these issues, but such feedback is all too often partial, inconsistent, and inaccurate. This is why expert reviews are important. The adjacent table relays the overall verdicts of several of the most popular camera review sites. The full reviews are available, respectively, at cameralabs.com, dpreview.com, ephotozine.com, imaging-resource.com, and photographyblog.com.

Review scores
Camera camera
labs
dp
review
ephoto
zine
imaging
resource
photography
blog
Camera
Launch
(year)
Launch
Price
(USD)
Street
Price
(amazon)
Used
Price
(ebay)
Pentax 645D - - - 4.5/5 - 2010 9,995discont. check
Canon 1D X Mark II (⇒ lft | rgt) - 89/100 Gold 4.5/5 5/5 4.5/5 2016 5,999 latest check
Canon 1D X (⇒ lft | rgt) - - 4.5/5 4.5/5 4.5/5 2011 6,799discont. check
Canon 1D Mark IV (⇒ lft | rgt) - 89/100 Gold - 5/5 - 2009 4,999discont. check
Leica S Typ 006 (⇒ lft | rgt) - - - - - 2012 21,950discont. check
Nikon D850 (⇒ lft | rgt) HiRec 89/100 Gold 4.5/5 5/5 5/5 2017 3,299 latest check
Nikon D5 (⇒ lft | rgt) - 89/100 Gold 4.5/5 5/5 5/5 2016 6,499 latest check
Nikon D810 (⇒ lft | rgt) - 86/100 Gold 5/5 4.5/5 4.5/5 2014 3,299discont. check
Nikon D3S (⇒ lft | rgt) - 89/100 Gold 4.5/5 5/5 5/5 2009 5,199discont. check
Pentax 645Z (⇒ lft | rgt) - - 4.5/5 5/5 5/5 2014 8,499 latest check
Sony A7R (⇒ lft | rgt) HiRec 82/100 Gold 4.5/5 5/5 5/5 2013 2,299discont. check

Care should be taken when interpreting the review scores above, though. The ratings are only valid when refering to cameras in the same category and of the same age. Hence, a score should always be seen in the context of the camera's market launch date and its price, and rating-comparisons among cameras that span long time periods or concern very differently equipped models make little sense. It should also be noted that some of the review sites have over time altered the way they render their verdicts.

Pentax 645D FAQ

Below are some additional questions and answers concerning some particular features of the 645D.

What is the technology behind the imaging sensor in the 645D?

The camera has a CCD (Charged Coupled Device) sensor at its core.

Which image processing chip is used to convert the raw signal into an image file and perform noise reduction and image sharpening?

Pentax equipped the 645D with the PRIME II image processor.

What is the ISO sensitivity range of the 645D?

The camera has a native sensitivity range from ISO 100 to ISO 1600.

What is the fastest shutter speed that can be used with flash?

The 645D's flash sync speed is 1/125 sec.

Which battery does the 645D use?

The camera gets its power from the D-LI90, which is a rechargeable Lithium-Ion power pack.

Camera to camera comparisons

If you would like to see a side-by-side review of this and another camera, just make your choice using the following search menu. There is also a set of direct links to comparison reviews that other users of the CAM-parator app explored. If the camera you are interested in is not available, please send me an email, and I will try to locate and add the respective data to the application.

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