Pentax 645D versus Nikon D810
The Pentax 645D and the Nikon D810 are two professional cameras that were announced, 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 consecutive views from the front, the top, and the rear side are shown. All width, height and depth dimensions are rounded to the nearest millimeter. You can also use the toggle button to switch to a percentage comparison if you prefer that the measures are being expressed in relative terms (in this case, the camera on the left – the 645D – represents the basis or 100 percent 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)||6.1 in||4.6 in||4.7 in||52.2 oz||..||YES||2010||9,995||discont.||check|
|Nikon D810 (⇒ lft)||5.7 in||4.8 in||3.2 in||34.6 oz||1200||YES||2014||3,299||discont.||check|
|Leica S Typ 006 (⇒ lft | rgt)||6.3 in||4.7 in||3.1 in||44.4 oz||..||YES||2012||21,950||discont.||check|
|Nikon D850 (⇒ lft | rgt)||5.7 in||4.9 in||3.1 in||35.5 oz||1840||YES||2017||3,299||latest||check|
|Nikon D750 (⇒ lft | rgt)||5.6 in||4.4 in||3.1 in||26.5 oz||1230||YES||2014||2,299||latest||check|
|Nikon D610 (⇒ lft | rgt)||5.6 in||4.4 in||3.2 in||30.0 oz||900||YES||2013||1,999||latest||check|
|Nikon Df (⇒ lft | rgt)||5.7 in||4.3 in||2.6 in||26.8 oz||1400||YES||2013||2,749||latest||check|
|Nikon D800 (⇒ lft | rgt)||5.7 in||4.8 in||3.2 in||35.3 oz||..||YES||2012||2,999||discont.||check|
|Nikon D800E (⇒ lft | rgt)||5.7 in||4.8 in||3.2 in||35.3 oz||..||YES||2012||3,299||discont.||check|
|Nikon D7000 (⇒ lft | rgt)||5.2 in||4.1 in||3.0 in||27.5 oz||1050||YES||2010||1,499||discont.||check|
|Nikon D3S (⇒ lft | rgt)||6.3 in||6.2 in||3.5 in||43.7 oz||4200||YES||2009||5,199||discont.||check|
|Pentax K-1 (⇒ lft | rgt)||5.4 in||4.3 in||3.4 in||35.6 oz||760||YES||2016||1,799||latest||check|
|Pentax 645Z (⇒ lft | rgt)||6.1 in||4.6 in||4.8 in||54.7 oz||650||YES||2014||8,499||latest||check|
|Sony A7R (⇒ lft | rgt)||5.0 in||3.7 in||1.9 in||16.4 oz||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 sensor inside a digital camera is one of the key determinants of image quality. A large sensor will tend to have larger individual pixels that provide better low-light sensitivity, wider dynamic range, and richer color depth than smaller pixel-units 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 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 assesses and scores the color depth ("DXO Portrait"), dynamic range ("DXO Landscape"), and low-light sensitivity ("DXO Sports") of camera sensors, and also publishes an overall camera score. 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 table below summarizes the physical sensor characteristics and sensor quality findings and compares them across a set of similar 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|
|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 D750 (⇒ lft | rgt)||Full Frame||24.2||6016||4016||1080/60p||24.8||14.5||2956||93|
|Nikon D610 (⇒ lft | rgt)||Full Frame||24.2||6016||4016||1080/30p||25.1||14.4||2925||94|
|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 D7000 (⇒ lft | rgt)||APS-C||16.1||4928||3264||10800/24p||23.5||13.9||1167||80|
|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 range 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 table below summarizes some of the other core capabilities of the Pentax 645D and Nikon D810 in connection with corresponding information for a sample of similar cameras. If you need more detail on the specs, you can find comprehensive listings, 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|
|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 D750 (⇒ lft | rgt)||optical||YES||3.2||1229||tilting||no||4000||6.0||12||no|
|Nikon D610 (⇒ lft | rgt)||optical||YES||3.2||921||fixed||no||4000||6.0||12||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 D7000 (⇒ lft | rgt)||optical||YES||3.0||921||fixed||no||8000||6.0||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 what conclusions can be drawn? Is there a clear favorite between the Pentax 645D and the Pentax 645D? The listing below highlights the relative strengths of the two models.
Reasons to prefer the Pentax 645D:
- More heavily discounted: Has been available for much longer (launched in March 2010).
Advantages 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 number of relative strengths (bullet points above) is taken as a guide, 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 remains incomplete and does no justice, for example, to the way the 645D or the D810 handle or perform in practice. User reviews, such as those found at amazon, can sometimes inform about these issues, but such feedback is often incomplete, inconsistent, and biased. This is why expert reviews are important. The table below summarizes the assessments of some of the best known camera review sites. You can find the full text of the reviews, 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|
|Leica S Typ 006 (⇒ lft | rgt)||-||-||-||-||-||2012||21,950||discont.||check|
|Nikon D850 (⇒ lft | rgt)||..||89/100 Gold||4.5/5||..||5/5||2017||3,299||latest||check|
|Nikon D750 (⇒ lft | rgt)||HiRec||90/100 Gold||4.5/5||5/5||4.5/5||2014||2,299||latest||check|
|Nikon D610 (⇒ lft | rgt)||HiRec||87/100 Gold||4.5/5||4.5/5||4.5/5||2013||1,999||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 D7000 (⇒ lft | rgt)||-||80/100 Silver||4.5/5||5/5||4.5/5||2010||1,499||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 ratings were established in reference to similarly priced cameras that were available in the market at the time of the review. 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. Also, kindly note that some of the listed sites have over time developped their review approaches and their reporting style.
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