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Canon 5DS R versus Pentax 645D

The Canon EOS 5DS R and the Pentax 645D are two professional cameras that were announced, respectively, in February 2015 and March 2010. Both are DSLR (Digital Single Lens Reflex) cameras that are based on a full frame (5DS R) and a medium format sensor. The Canon has a resolution of 50.3 megapixel, whereas the Pentax provides 39.5 MP.

Body comparison

An illustration of the physical size and weight of the Canon 5DS R and the Pentax 645D 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. 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 – the 5DS R – represents the basis or 100 percent across all the size and weight measures).

Canon 5DS R vs Pentax 645D front
5DS R versus 645D top view
5DS R and 645D rear side
Body view (5DS R on the left)

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Pentax 645D is somewhat larger (4 percent) than the Canon 5DS R. Moreover, the 645D is substantially heavier (59 percent) than the 5DS R. 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
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)
Canon 5DS R (⇒ rgt) 152 mm 116 mm 76 mm 930 g 700 YES 2015 3,699 latest check
Pentax 645D (⇒ lft) 156 mm 117 mm 119 mm 1480 g .. YES 2010 9,995discont. 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 (⇒ lft | rgt) 152 mm 116 mm 76 mm 930 g 700 YES 2015 3,699 latest check
Canon 6D (⇒ lft | rgt) 145 mm 111 mm 71 mm 770 g 1090 YES 2012 2,099discont. check
Canon 5D Mark III (⇒ lft | rgt) 152 mm 116 mm 76 mm 950 g 950 YES 2012 3,499discont. 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
Canon 5D Mark II (⇒ lft | rgt) 152 mm 114 mm 75 mm 850 g 850 YES 2008 3,499discont. check
Canon 5D (⇒ lft | rgt) 152 mm 113 mm 75 mm 895 g 400 YES 2005 3,299discont. 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 D810 (⇒ lft | rgt) 146 mm 123 mm 82 mm 980 g 1200 YES 2014 3,299discont. check
Pentax 645Z (⇒ lft | rgt) 156 mm 117 mm 123 mm 1550 g 650 YES 2014 8,499 latest check
Sony A99 II (⇒ lft | rgt) 143 mm 104 mm 76 mm 849 g 490 YES 2016 3,199 latest check

The listed prices provide an indication of the market segment that the manufacturer of the cameras have been targeting. The 5DS R was launched at a markedly lower price (by 63 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.

Sensor comparison

The size of the sensor inside a digital camera is one of the key determinants of image quality. A large sensor will generally have larger individual pixels that offer better low-light sensitivity, provide wider dynamic range, and have 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 Canon 5DS R features a full frame sensor and the Pentax 645D a medium format sensor. The sensor area in the 645D is 68 percent bigger. As a result of these sensor size differences, the cameras have a format factor of, respectively, 1.0 and 0.79. The sensor in the 5DS R has a native 3:2 aspect ratio, while the one in the 645D offers a 4:3 aspect.

Canon 5DS R and Pentax 645D sensor measures
Sensor size

Despite having a smaller sensor, the Canon 5DS R offers a higher resolution of 50.3 megapixel, compared with 39.5 MP of the Pentax 645D. This megapixel advantage comes at the cost of a higher pixel density and a smaller size of the individual pixel (with a pixel pitch of 4.14μm versus 6.06μm for the 645D). However, it should be noted that the 5DS R is much more recent (by 4 years and 10 months) than the 645D, and its sensor will have benefitted from technological advances during this time that make it possible to gather light more efficiently. 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.

5DS R versus 645D MP
Sensor resolution

Consistent information on actual sensor performance is available from DXO Mark for most cameras. 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 5DS R has a notably higher overall DXO score than the 645D (overall score 4 points higher), which gives it an advantage in terms of imaging quality. 0.2 EV of lower dynamic range, and 0.9 stops in additional low light sensitivity. 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
Canon 5DS R (⇒ rgt) Full Frame 50.3 8688 5792 1080/60p 24.6 12.4 2308 86
Pentax 645D (⇒ lft) Medium Format 39.5 7264 5440 no 24.6 12.6 1262 82
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 (⇒ lft | rgt) Full Frame 50.3 8688 5792 1080/60p 24.7 12.4 2381 87
Canon 6D (⇒ lft | rgt) Full Frame 20.0 5472 3648 1080/30p 23.8 12.1 2340 82
Canon 5D Mark III (⇒ lft | rgt) Full Frame 22.1 5760 3840 1080/30p 24 11.7 2293 81
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
Canon 5D Mark II (⇒ lft | rgt) Full Frame 21.0 5616 3744 1080/30p 23.7 11.9 1815 79
Canon 5D (⇒ lft | rgt) Full Frame 12.7 4368 2912 no 22.9 11.1 1368 71
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 D810 (⇒ lft | rgt) Full Frame 36.2 7360 4912 1080/60p 25.7 14.8 2853 97
Pentax 645Z (⇒ lft | rgt) Medium Format 51.1 8256 6192 1080/60i 26.0 14.7 4505 101
Sony A99 II (⇒ lft | rgt) Full Frame 42.2 7952 5304 4K/30p 25.4 13.4 2317 92

Many modern cameras are not only capable of taking still images, but can also record movies. The 5DS R indeed provides movie recording capabilities, while the 645D does not. The highest resolution format that the 5DS R can use is 1080/60p.

Feature comparison

Apart from body and sensor, cameras can and do differ across a range of features. The 5DS R and the 645D 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 Canon 5DS R and Pentax 645D along with similar information for a selection of comparators. 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
Canon 5DS R (⇒ rgt) optical YES 3.2 1040 fixed no 8000 5.0 no no
Pentax 645D (⇒ lft) optical YES 3.0 921 fixed no 4000 1.1 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 (⇒ lft | rgt) optical YES 3.2 1040 fixed no 8000 5.0 no no
Canon 6D (⇒ lft | rgt) optical YES 3.0 1040 fixed no 4000 4.5 no no
Canon 5D Mark III (⇒ lft | rgt) optical YES 3.2 1040 fixed no 8000 6.0 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
Canon 5D Mark II (⇒ lft | rgt) optical YES 3.0 920 fixed no 8000 3.9 no no
Canon 5D (⇒ lft | rgt) optical YES 2.5 230 fixed no 8000 3.0 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 D810 (⇒ lft | rgt) optical YES 3.2 1229 fixed no 4000 5.0 12 no
Pentax 645Z (⇒ lft | rgt) optical YES 3.2 1037 tilting no 4000 3.0 no no
Sony A99 II (⇒ lft | rgt) 2400 YES 3.0 1229 tilting no 8000 12.0 no YES

The 5DS R is a current model that online retailers, such as amazon, will have in stock. In contrast, the 645D has been discontinued (but it can be found pre-owned on ebay). As a replacement in the same line of cameras, the 645D was succeeded by the Pentax 645Z.

Summary

So what conclusions can be drawn? Is there a clear favorite between the Canon 5DS R and the Canon 5DS R? A synthesis of the relative strong points of each of the models is listed below.


Advantages of the Canon EOS 5DS R:

  • More detail: Offers more megapixels (50.3 vs 39.5MP) with a 15% higher linear resolution.
  • Better image quality: Scores markedly higher (4 points) in the DXO overall assessment.
  • Better low-light sensitivity: Requires less light for good images (0.9 stops ISO advantage).
  • Broader imaging potential: Can record not only still images but also 1080/60p movies.
  • 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 (1040k vs 921k dots).
  • Faster shutter: Has higher mechanical shutter speed (8000/sec vs 4000/sec) to freeze action.
  • Faster burst: Shoots at higher frequency (5 vs 1.1 flaps/sec) to capture the decisive moment.
  • Less heavy: Is lighter (by 550g or 37 percent) and hence easier to carry around.
  • More affordable: Was introduced into a lower priced category (63 percent cheaper at launch).
  • More modern: Reflects 4 years and 10 months of technical progress since the 645D launch.

Arguments in favor of the Pentax 645D:

  • More heavily discounted: Has been around for much longer (launched in March 2010).

If the count of individual advantages (bullet points above) is taken as a guide, the 5DS R is the clear winner of the match-up (11 : 1 points). However, the relative importance of the various individual camera aspects will vary according to personal preferences and needs, so that you might like to apply corresponding weights to the particular features.

5DS R 11:01 645D

In any case, while the comparison of the spec-sheets of cameras can offer a general idea of their imaging potential, it remains partial and cannot reveal, for example, the handling experience and imaging performance when actually working with the 5DS R or the 645D. 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 hands-on reviews by experts 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.

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)
Canon 5DS R (⇒ rgt) Rec 83/100 Silver 5/5 5/5 4.5/5 2015 3,699 latest check
Pentax 645D (⇒ lft) - - - 4.5/5 - 2010 9,995discont. 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 (⇒ lft | rgt) Rec 83/100 Silver 4.5/5 5/5 4.5/5 2015 3,699 latest check
Canon 6D (⇒ lft | rgt) HiRec 83/100 Silver 4.5/5 4.5/5 4.5/5 2012 2,099discont. check
Canon 5D Mark III (⇒ lft | rgt) HiRec 82/100 Gold 4.5/5 5/5 4.5/5 2012 3,499discont. 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
Canon 5D Mark II (⇒ lft | rgt) 91/100 79/100 HiRec 4/5 5/5 - 2008 3,499discont. check
Canon 5D (⇒ lft | rgt) 88/100 HiRec reviewed reviewed - 2005 3,299discont. check
Leica S Typ 006 (⇒ lft | rgt) - - - - - 2012 21,950discont. check
Nikon D850 (⇒ lft | rgt) HiRec 89/100 Gold 4.5/5 .. 5/5 2017 3,299 latest check
Nikon D810 (⇒ lft | rgt) - 86/100 Gold 5/5 4.5/5 4.5/5 2014 3,299discont. check
Pentax 645Z (⇒ lft | rgt) - - 4.5/5 5/5 5/5 2014 8,499 latest check
Sony A99 II (⇒ lft | rgt) - 85/100 Silver 4.5/5 4.5/5 4.5/5 2016 3,199 latest 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. Also, kindly note that some of the listed sites have over time developped their review approaches and their reporting style.

Other comparisons

In case you would like to check on the differences and similarities of other camera models, 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 contact me, and I will try to add information on that model to the database.

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