Pentax 645D versus Nikon D810
The Pentax 645D and the Nikon D810 are two professional cameras that were revealed to the public, respectively, in March 2010 and June 2014. Both are DSLR (Digital Single Lens Reflex) cameras that are based on a medium format (645D) and a full frame sensor. The Pentax has a resolution of 39.5 megapixel, whereas the Nikon provides 36.2 MP.
The physical size and weight of the Pentax 645D and the Nikon D810 are illustrated in the side-by-side display below. Three successive views from the front, the top, and the rear are shown. All size dimensions are rounded to the nearest millimeter. If you prefer, you can also use the toggle button to switch to a comparison in percentage terms (in this case, the camera on the left side – the 645D – represents the basis for the calculations across all the size and weight measures).
If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Nikon D810 is somewhat smaller (2 percent) than the Pentax 645D. Moreover, the D810 is markedly lighter (34 percent) than the 645D. In this context, it is worth noting that both cameras are splash and dust-proof and can, hence, be used in inclement weather conditions or harsh environments.
The above size and weight comparisons are to some extent incomplete since they do not consider the interchangeable lenses that both of these cameras require. Hence, you might want to study the specifications of available lenses in order to get the full picture of the size and weight of the two camera systems.
The table below summarizes the key physical specs of the two cameras alongside a broader set of comparators. If you want to switch the focus of the display and review another camera pair, just select a new right or left 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 (⇒ rgt)||156 mm||117 mm||119 mm||1480 g||..||YES||2010||9,995||discont.||check|
|Nikon D810 (⇒ lft)||146 mm||123 mm||82 mm||980 g||1200||YES||2014||3,299||discont.||check|
|Canon 5DS R (⇒ lft | rgt)||152 mm||116 mm||76 mm||930 g||700||YES||2015||3,699||latest||check|
|Canon 5DS (⇒ lft | rgt)||152 mm||116 mm||76 mm||930 g||700||YES||2015||3,699||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 Df (⇒ lft | rgt)||144 mm||110 mm||67 mm||760 g||1400||YES||2013||2,749||latest||check|
|Nikon D800 (⇒ lft | rgt)||146 mm||123 mm||82 mm||1000 g||..||YES||2012||2,999||discont.||check|
|Nikon D800E (⇒ lft | rgt)||146 mm||123 mm||82 mm||1000 g||..||YES||2012||3,299||discont.||check|
|Nikon D3S (⇒ lft | rgt)||160 mm||157 mm||88 mm||1240 g||4200||YES||2009||5,199||discont.||check|
|Pentax K-1 (⇒ lft | rgt)||137 mm||110 mm||86 mm||1010 g||760||YES||2016||1,799||latest||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 D810 was launched at a markedly lower price (by 67 percent) than the 645D, which puts it into a different market segment. 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.
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. Further, a large sensor camera will give the photographer additional creative options when using shallow depth-of-field to isolate a subject from its background. On the downside, larger sensors are more costly to manufacture and tent to lead to bigger and heavier cameras and lenses.
Of the two cameras under consideration, the Pentax 645D features a medium format sensor and the Nikon D810 a full frame sensor. The sensor area in the D810 is 41 percent smaller. As a result of these sensor size differences, the cameras have a format factor of, respectively, 0.79 and 1.0. The sensor in the 645D has a native 4:3 aspect ratio, while the one in the D810 offers a 3:2 aspect.
With 39.5MP, the 645D offers a slightly higher resolution than the D810 (36.2MP), but the 645D nevertheless has larger individual pixels (pixel pitch of 6.06μm versus 4.88μm for the D810) due to its larger sensor. However, the D810 is a somewhat more recent model (by 4 years and 3 months) than the 645D, and its sensor might have benefitted from technological advances during this time that further enhance the light gathering capacity of its pixels. Coming back to sensor resolution, it should be mentioned that neither of the two cameras has an anti-alias filter installed, so they are able to capture all the detail the sensor resolves.
For most cameras, data on sensor performance has been reported by DXO Mark. This service determines an overall sensor rating, as well as sub-scores for low-light sensitivity ("DXO Sports"), dynamic range ("DXO Landscape"), and color depth ("DXO Portrait"). Of the two cameras under consideration, the D810 offers substantially better image quality than the 645D (overall score 15 points higher). The advantage is based on 1.1 bits higher color depth, 2.2 EV in additional dynamic range, and 1.2 stops in additional low light sensitivity. The adjacent table reports on the physical sensor characteristics and the outcomes of the DXO sensor quality tests for a sample of comparator-cameras.
|Pentax 645D (⇒ rgt)||Medium Format||39.5||7264||5440||no||24.6||12.6||1262||82|
|Nikon D810 (⇒ lft)||Full Frame||36.2||7360||4912||1080/60p||25.7||14.8||2853||97|
|Canon 5DS R (⇒ lft | rgt)||Full Frame||50.3||8688||5792||1080/60p||24.6||12.4||2308||86|
|Canon 5DS (⇒ lft | rgt)||Full Frame||50.3||8688||5792||1080/60p||24.7||12.4||2381||87|
|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 Df (⇒ lft | rgt)||Full Frame||16.2||4928||3280||no||24.6||13.1||3279||89|
|Nikon D800 (⇒ lft | rgt)||Full Frame||36.2||7360||4912||1080/30p||25.3||14.4||2853||95|
|Nikon D800E (⇒ lft | rgt)||Full Frame||36.2||7360||4912||1080/30p||25.6||14.3||2979||96|
|Nikon D3S (⇒ lft | rgt)||Full Frame||12.1||4256||2832||720/24p||23.5||12.0||3253||82|
|Pentax K-1 (⇒ lft | rgt)||Full Frame||36.2||7360||4912||1080/60i||25.4||14.6||3280||96|
|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|
Many modern cameras are not only capable of taking still images, but also of capturing video footage. The D810 indeed provides for movie recording, while the 645D does not. The highest resolution format that the D810 can use is 1080/60p.
Apart from body and sensor, cameras can and do differ across a variety of features. The 645D and the D810 are similar in the sense that both have an optical viewfinder. The latter is useful for getting a clear image for framing even in brightly lit environments. The adjacent table lists some of the other core features of the Pentax 645D and Nikon D810 along with similar information for a selection of comparators. The full specs-sheets can be found in the camera manual or, for example, in the dpreview camera hub.
|Pentax 645D (⇒ rgt)||optical||YES||3.0||921||fixed||no||4000||1.1||no||no|
|Nikon D810 (⇒ lft)||optical||YES||3.2||1229||fixed||no||4000||5.0||12||no|
|Canon 5DS R (⇒ lft | rgt)||optical||YES||3.2||1040||fixed||no||8000||5.0||no||no|
|Canon 5DS (⇒ lft | rgt)||optical||YES||3.2||1040||fixed||no||8000||5.0||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 Df (⇒ lft | rgt)||optical||YES||3.2||921||fixed||no||4000||5.5||no||no|
|Nikon D800 (⇒ lft | rgt)||optical||YES||3.2||921||fixed||no||8000||4.0||12||no|
|Nikon D800E (⇒ lft | rgt)||optical||YES||3.2||921||fixed||no||8000||4.0||12||no|
|Nikon D3S (⇒ lft | rgt)||optical||YES||3.0||921||fixed||no||8000||11.0||no||no|
|Pentax K-1 (⇒ lft | rgt)||optical||YES||3.2||1037||full-flex||no||8000||4.4||no||YES|
|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|
Both the 645D and the D810 have been discontinued, but can regularly be found used on ebay. The 645D was replaced by the Pentax 645Z, while the D810 was followed by the Nikon D850.
So how do things add up? Which of the two cameras – the Pentax 645D or the Nikon D810 – has the upper hand? The listing below highlights the relative strengths of the two models.
Advantages of the Pentax 645D:
- More heavily discounted: Has been available for much longer (launched in March 2010).
Arguments in favor of the Nikon D810:
- Better image quality: Scores substantially higher (15 points) in the DXO overall evaluation.
- Richer colors: Generates noticeably more natural colors (1.1 bits more color depth).
- More dynamic range: Captures a broader range of light and dark details (2.2 EV of extra DR).
- Better low-light sensitivity: Can shoot in dim conditions (1.2 stops ISO advantage).
- Broader imaging potential: Can capture not only stills but also 1080/60p video.
- Larger screen: Has a bigger rear LCD (3.2" vs 3.0") for image review and settings control.
- More detailed LCD: Has a higher resolution rear screen (1229k vs 921k dots).
- Faster burst: Shoots at higher frequency (5 vs 1.1 flaps/sec) to capture the decisive moment.
- Less heavy: Has a lower weight (by 500g or 34 percent) and is thus easier to take along.
- Easier fill-in: Has a small integrated flash to brighten shadows of backlit subjects.
- More affordable: Was introduced into a lower priced category (67 percent cheaper at launch).
- More modern: Reflects 4 years and 3 months of technical progress since the 645D launch.
If the count of relative strengths (bullet points above) is taken as a measure, the D810 is the clear winner of the contest (12 : 1 points). However, the relevance of individual strengths will vary across photographers, so that you might want to apply your own weighing scheme to the summary points.
In any case, 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 and the D810 in practical situations. At times, user reviews, such as those published at amazon, address these issues in a useful manner, but such feedback is on many occasions incomplete, inconsistent, and unreliable. 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.
|Pentax 645D (⇒ rgt)||-||-||-||4.5/5||-||2010||9,995||discont.||check|
|Nikon D810 (⇒ lft)||-||86/100 Gold||5/5||4.5/5||4.5/5||2014||3,299||discont.||check|
|Canon 5DS R (⇒ lft | rgt)||Rec||83/100 Silver||5/5||5/5||4.5/5||2015||3,699||latest||check|
|Canon 5DS (⇒ lft | rgt)||Rec||83/100 Silver||4.5/5||5/5||4.5/5||2015||3,699||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||2017||3,299||latest||check|
|Nikon Df (⇒ lft | rgt)||-||81/100||4/5||4/5||4/5||2013||2,749||latest||check|
|Nikon D800 (⇒ lft | rgt)||HiRec||82/100 Gold||5/5||5/5||5/5||2012||2,999||discont.||check|
|Nikon D800E (⇒ lft | rgt)||-||84/100 Gold||5/5||4.5/5||5/5||2012||3,299||discont.||check|
|Nikon D3S (⇒ lft | rgt)||-||89/100 Gold||4.5/5||5/5||5/5||2009||5,199||discont.||check|
|Pentax K-1 (⇒ lft | rgt)||-||84/100 Silver||5/5||4.5/5||5/5||2016||1,799||latest||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|
The above review scores should be interpreted with care, though. The assessments were made in relation to similar cameras of the same technological generation. Thus, a score needs to be put into the context of the launch date and the launch price of the camera, 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.
If you would like to see a different side-by-side camera review, just make a corresponding selection in the search boxes below. An an alternative, you can also directly jump to any one of the listed comparisons that were previously generated by the CAM-parator tool. If you do not see the camera that you are looking for, kindly get in touch, and I will try to update the database with the necessary infos.
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