Pentax 645Z versus Canon 5DS
The Pentax 645Z and the Canon EOS 5DS are two professional cameras that were revealed to the public, respectively, in April 2014 and February 2015. Both are DSLR (Digital Single Lens Reflex) cameras that are based on a medium format (645Z) and a full frame sensor. The Pentax has a resolution of 51.1 megapixel, whereas the Canon provides 50.3 MP.
The physical size and weight of the Pentax 645Z and the Canon 5DS are illustrated in the side-by-side display below. Three consecutive perspectives from the front, the top, and the back are presented. 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 side – the 645Z – 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 Canon 5DS is somewhat smaller (3 percent) than the Pentax 645Z. Moreover, the 5DS is substantially lighter (40 percent) than the 645Z. 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 645Z (⇒ rgt)||156 mm||117 mm||123 mm||1550 g||650||YES||2014||8,499||latest||check|
|Canon 5DS (⇒ lft)||152 mm||116 mm||76 mm||930 g||700||YES||2015||3,699||latest||check|
|Canon 6D Mark II (⇒ lft | rgt)||144 mm||111 mm||75 mm||765 g||1200||YES||2017||1,999||latest||check|
|Canon 5D Mark IV (⇒ lft | rgt)||151 mm||116 mm||76 mm||890 g||900||YES||2016||3,499||latest||check|
|Canon 1D X Mark II (⇒ lft | rgt)||158 mm||168 mm||83 mm||1530 g||1210||YES||2016||5,999||latest||check|
|Canon 5DS R (⇒ lft | rgt)||152 mm||116 mm||76 mm||930 g||700||YES||2015||3,699||latest||check|
|Hasselblad X1D (⇒ lft | rgt)||150 mm||98 mm||71 mm||725 g||..||YES||2016||8,995||latest||check|
|Leica SL (⇒ lft | rgt)||147 mm||104 mm||39 mm||847 g||400||YES||2015||7,450||latest||check|
|Nikon D850 (⇒ lft | rgt)||146 mm||124 mm||79 mm||1005 g||1840||YES||2017||3,299||latest||check|
|Nikon D750 (⇒ lft | rgt)||141 mm||113 mm||78 mm||750 g||1230||YES||2014||2,299||latest||check|
|Nikon D810 (⇒ lft | rgt)||146 mm||123 mm||82 mm||980 g||1200||YES||2014||3,299||discont.||check|
|Nikon D4S (⇒ lft | rgt)||160 mm||157 mm||91 mm||1350 g||3020||YES||2014||6,499||discont.||check|
|Pentax 645D (⇒ lft | rgt)||156 mm||117 mm||119 mm||1480 g||..||YES||2010||9,995||discont.||check|
|Sony RX1R II (⇒ lft | rgt)||113 mm||65 mm||72 mm||507 g||220||no||2015||3,299||latest||check|
|Sony A7S (⇒ lft | rgt)||127 mm||94 mm||48 mm||489 g||380||YES||2014||2,499||discont.||check|
The listed prices provide an indication of the market segment that the manufacturer of the cameras have been targeting. The 5DS was launched at a markedly lower price (by 56 percent) than the 645Z, 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. 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. 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 are more costly to manufacture and tent to lead to bigger and heavier cameras and lenses.
Of the two cameras under consideration, the Pentax 645Z features a medium format sensor and the Canon 5DS a full frame sensor. The sensor area in the 5DS is 40 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 645Z has a native 4:3 aspect ratio, while the one in the 5DS offers a 3:2 aspect.
With 51.1MP, the 645Z offers a slightly higher resolution than the 5DS (50.3MP), but the 645Z nevertheless has larger individual pixels (pixel pitch of 5.30μm versus 4.14μm for the 5DS) due to its larger sensor. However, the 5DS is a somewhat more recent model (by 9 months) than the 645Z, and its sensor might have benefitted from technological advances during this time that enhance the light gathering capacity of its pixels. Coming back to sensor resolution, it should be mentioned that the 645Z has no anti-alias filter installed, so that it can capture all the detail its sensor resolves.
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"). Of the two cameras under review, the 645Z provides substantially higher image quality than the 5DS, with an overall score that is 14 points higher. This advantage is based on 1.3 bits higher color depth, 2.3 EV in additional dynamic range, and 0.9 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 645Z (⇒ rgt)||Medium Format||51.1||8256||6192||1080/60i||26.0||14.7||4505||101|
|Canon 5DS (⇒ lft)||Full Frame||50.3||8688||5792||1080/60p||24.7||12.4||2381||87|
|Canon 6D Mark II (⇒ lft | rgt)||Full Frame||26.0||6240||4160||1080/60p||24.4||11.9||2862||85|
|Canon 5D Mark IV (⇒ lft | rgt)||Full Frame||30.1||6720||4480||4K/30p||24.8||13.6||2995||91|
|Canon 1D X Mark II (⇒ lft | rgt)||Full Frame||20.0||5472||3648||4K/60p||24.1||13.5||3207||88|
|Canon 5DS R (⇒ lft | rgt)||Full Frame||50.3||8688||5792||1080/60p||24.6||12.4||2308||86|
|Hasselblad X1D (⇒ lft | rgt)||Medium Format||51.3||8272||6200||1080/25p||26.2||14.8||4489||102|
|Leica SL (⇒ lft | rgt)||Full Frame||24.0||6000||4000||4K/30p||25.0||13.4||1821||88|
|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 D810 (⇒ lft | rgt)||Full Frame||36.2||7360||4912||1080/60p||25.7||14.8||2853||97|
|Nikon D4S (⇒ lft | rgt)||Full Frame||16.2||4928||3280||1080/60p||24.4||13.3||3074||89|
|Pentax 645D (⇒ lft | rgt)||Medium Format||39.5||7264||5440||no||24.6||12.6||1262||82|
|Sony RX1R II (⇒ lft | rgt)||Full Frame||42.2||7952||5304||1080/60p||25.8||13.9||3204||97|
|Sony A7S (⇒ lft | rgt)||Full Frame||12.0||4240||2832||1080/60p||23.9||13.2||3702||87|
Many modern cameras are not only capable of taking still images, but also of capturing video footage. Both cameras under consideration are equipped with sensors that have a sufficiently high read-out speed for moving images, but the 5DS provides a faster frame rate than the 645Z. It can shoot movie footage at 1080/60p, while the Pentax is limited to 1080/60i.
Beyond body and sensor, cameras can and do differ across a range of features. The 645Z and the 5DS 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 following table reports on some other key feature differences and similarities of the Pentax 645Z, the Canon 5DS, and comparable cameras. The full specs-sheets can be found in the camera manual or, for example, in the dpreview camera hub.
|Pentax 645Z (⇒ rgt)||optical||YES||3.2||1037||tilting||no||4000||3.0||no||no|
|Canon 5DS (⇒ lft)||optical||YES||3.2||1040||fixed||no||8000||5.0||no||no|
|Canon 6D Mark II (⇒ lft | rgt)||optical||YES||3.0||1040||swivel||YES||4000||6.5||no||no|
|Canon 5D Mark IV (⇒ lft | rgt)||optical||YES||3.2||1620||fixed||YES||8000||7.0||no||no|
|Canon 1D X Mark II (⇒ lft | rgt)||optical||YES||3.2||1620||fixed||YES||8000||16.0||no||no|
|Canon 5DS R (⇒ lft | rgt)||optical||YES||3.2||1040||fixed||no||8000||5.0||no||no|
|Hasselblad X1D (⇒ lft | rgt)||2360||no||3.0||920||fixed||YES||2000||2.3||no||no|
|Leica SL (⇒ lft | rgt)||4400||YES||3.0||1040||fixed||YES||8000||11.0||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 D810 (⇒ lft | rgt)||optical||YES||3.2||1229||fixed||no||4000||5.0||12||no|
|Nikon D4S (⇒ lft | rgt)||optical||YES||3.2||921||fixed||no||8000||11.0||no||no|
|Pentax 645D (⇒ lft | rgt)||optical||YES||3.0||921||fixed||no||4000||1.1||no||no|
|Sony RX1R II (⇒ lft | rgt)||2360||no||3.0||1229||tilting||no||4000||5.0||no||no|
|Sony A7S (⇒ lft | rgt)||2400||no||3.0||921||tilting||no||8000||5.0||no||no|
Both the 645Z and the 5DS are current models that good online retailers will have in stock. You can check the latest prices, for example, at amazon. The 645Z replaced the earlier Pentax 645D, while the 5DS does not have a direct predecessor.
So how do things add up? Which of the two cameras – the Pentax 645Z or the Canon 5DS – has the upper hand? A synthesis of the relative strong points of each of the models is listed below.
Arguments in favor of the Pentax 645Z:
- Maximized detail: Lacks an anti-alias filter to exploit the sensor's full resolution potential.
- Better image quality: Scores substantially higher (14 points) in the DXO overall assessment.
- Richer colors: Generates images with noticeably better colors (1.3 bits more color depth).
- More dynamic range: Captures a larger spectrum of light and dark details (2.3 EV of extra DR).
- Better low-light sensitivity: Requires less light for good images (0.9 stops ISO advantage).
- More flexible LCD: Has a tilting screen for odd-angle shots in landscape orientation.
- More heavily discounted: Has been on the market for longer (launched in April 2014).
Reasons to prefer the Canon EOS 5DS:
- Better moiré control: Has an anti-alias filter to avoid artificial patterns to appear in images.
- Better video: Provides higher movie framerates (1080/60p vs 1080/60i).
- Faster shutter: Has higher mechanical shutter speed (8000/sec vs 4000/sec) to freeze action.
- Faster burst: Shoots at higher frequency (5 vs 3 flaps/sec) to capture the decisive moment.
- Less heavy: Has a lower weight (by 620g or 40 percent) and is thus easier to take along.
- More affordable: Was introduced into a lower priced category (56 percent cheaper at launch).
- More modern: Was introduced somewhat (9 months) more recently.
If the count of individual advantages (bullet points above) is taken as a guide, the match-up finishes in a tie (7 points each). However, the pertinence of the various camera strengths will differ across photographers, so that you might want to weigh individual camera traits according to their importance for your own imaging needs.
In any case, while the specs-based evaluation of cameras is instructive in revealing their potential as photographic tools, it remains partial and cannot reveal, for example, the handling experience and imaging performance when actually working with the 645Z or the 5DS. 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 where reviews by experts come in. The adjacent table relays the overall verdicts of several of the most popular 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 645Z (⇒ rgt)||-||-||4.5/5||5/5||5/5||2014||8,499||latest||check|
|Canon 5DS (⇒ lft)||Rec||83/100 Silver||4.5/5||5/5||4.5/5||2015||3,699||latest||check|
|Canon 6D Mark II (⇒ lft | rgt)||Rec||80/100||4.5/5||4/5||4/5||2017||1,999||latest||check|
|Canon 5D Mark IV (⇒ lft | rgt)||HiRec||87/100 Gold||4.5/5||5/5||4.5/5||2016||3,499||latest||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 5DS R (⇒ lft | rgt)||Rec||83/100 Silver||5/5||5/5||4.5/5||2015||3,699||latest||check|
|Hasselblad X1D (⇒ lft | rgt)||-||-||-||-||4/5||2016||8,995||latest||check|
|Leica SL (⇒ lft | rgt)||-||84/100||4.5/5||4/5||4/5||2015||7,450||latest||check|
|Nikon D850 (⇒ lft | rgt)||HiRec||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 D810 (⇒ lft | rgt)||-||86/100 Gold||5/5||4.5/5||4.5/5||2014||3,299||discont.||check|
|Nikon D4S (⇒ lft | rgt)||-||-||4.5/5||5/5||4.5/5||2014||6,499||discont.||check|
|Pentax 645D (⇒ lft | rgt)||-||-||-||4.5/5||-||2010||9,995||discont.||check|
|Sony RX1R II (⇒ lft | rgt)||-||82/100 Silver||-||reviewed||4.5/5||2015||3,299||latest||check|
|Sony A7S (⇒ lft | rgt)||-||86/100 Gold||4.5/5||4.5/5||5/5||2014||2,499||discont.||check|
Care should be taken when interpreting the review scores above, though. The ratings were established in reference to similarly priced cameras that were available in the market at the time of the review. 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. Also, please note that some of the review sites have changed their methodology and reporting over time.
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