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.
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
|Pentax 645D||156 mm||117 mm||119 mm||1480 g||800||YES||2010||9,995||discont.||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||6,799||discont.||check|
|Canon 1D Mark IV (⇒ lft | rgt)||156 mm||157 mm||80 mm||1230 g||1500||YES||2009||4,999||discont.||check|
|Leica S Typ 006 (⇒ lft | rgt)||160 mm||120 mm||80 mm||1260 g||..||YES||2012||21,950||discont.||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||3,299||discont.||check|
|Nikon D3S (⇒ lft | rgt)||160 mm||157 mm||88 mm||1240 g||4200||YES||2009||5,199||discont.||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||2,299||discont.||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.
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.
|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|
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.
|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|
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.
|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||6,799||discont.||check|
|Canon 1D Mark IV (⇒ lft | rgt)||-||89/100 Gold||-||5/5||-||2009||4,999||discont.||check|
|Leica S Typ 006 (⇒ lft | rgt)||-||-||-||-||-||2012||21,950||discont.||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||3,299||discont.||check|
|Nikon D3S (⇒ lft | rgt)||-||89/100 Gold||4.5/5||5/5||5/5||2009||5,199||discont.||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||2,299||discont.||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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