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Canon 800D versus Canon 5D Mark III

The Canon EOS 800D (called Canon T7i in some regions) and the Canon EOS 5D Mark III are two digital cameras that were officially introduced, respectively, in February 2017 and March 2012. Both are DSLR (Digital Single Lens Reflex) cameras that are based on an APS-C (800D) and a full frame (5D Mark III) sensor. The 800D has a resolution of 24 megapixel, whereas the 5D Mark III provides 22.1 MP. Read on to find out how these two cameras compare with respect to their size, their sensors, their features, and their reception by expert reviewers.

Body comparison: Canon 800D vs Canon 5D Mark III

The side-by-side display below illustrates the physical size and weight of the Canon 800D and the Canon 5D Mark III. Three consecutive views from the front, the top, and the rear side 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 – the 800D – represents the basis or 100 percent across all the size and weight measures).

Compare Canon 800D vs Canon 5D Mark III
800D versus 5D Mark III top view
800D and 5D Mark III rear side
Body view (800D on the left)

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Canon 5D Mark III is notably larger (35 percent) than the Canon 800D. Moreover, the 5D Mark III is substantially heavier (79 percent) than the 800D. It is noteworthy in this context that the 5D Mark III is splash and dust-proof, while the 800D does not feature any corresponding weather-sealing.

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. A larger imaging sensor (as in the 5D Mark III) will tend to go along with bigger and heavier lenses, while more compact options are available for the smaller-sensor camera (800D). You can find a comprehensive overview of suitable optics in the Canon EF Lens Catalog.

Concerning battery life, the 800D gets 600 shots out of its LP-E17 battery, while the 5D Mark III can take 950 images on a single charge of its LP-E6 power pack.

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 camera 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 800D (⇒ rgt) 131 mm 100 mm 76 mm 532 g 600 no 2017 749 latest check
Canon 5D Mark III (⇒ lft) 152 mm 116 mm 76 mm 950 g 950 YES 2012 3,499discont. check
Canon 2000D (⇒ lft | rgt) 129 mm 101 mm 78 mm 475 g 500 no 2018 449 latest check
Canon 200D (⇒ lft | rgt) 122 mm 93 mm 70 mm 453 g 650 no 2017 549 latest check
Canon 77D (⇒ lft | rgt) 131 mm 100 mm 76 mm 540 g 600 no 2017 899 latest check
Canon M6 (⇒ lft | rgt) 112 mm 68 mm 45 mm 390 g 295 no 2017 779 latest check
Canon 1300D (⇒ lft | rgt) 129 mm 101 mm 78 mm 485 g 500 no 2016 449discont. check
Canon 5D Mark IV (⇒ lft | rgt) 151 mm 116 mm 76 mm 890 g 900 YES 2016 3,499 latest check
Canon G7 X Mark II (⇒ lft | rgt) 106 mm 61 mm 42 mm 319 g 265 no 2016 699 latest check
Canon 750D (⇒ lft | rgt) 132 mm 101 mm 78 mm 555 g 440 no 2015 749discont. check
Canon 760D (⇒ lft | rgt) 132 mm 101 mm 78 mm 565 g 440 no 2015 849discont. 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 700D (⇒ lft | rgt) 133 mm 100 mm 79 mm 580 g 440 no 2013 649discont. check
Canon 6D (⇒ lft | rgt) 145 mm 111 mm 71 mm 770 g 1090 YES 2012 2,099discont. check
Canon 5D Mark II (⇒ lft | rgt) 152 mm 114 mm 75 mm 850 g 850 YES 2008 3,499discont. check
Nikon D5600 (⇒ lft | rgt) 124 mm 97 mm 70 mm 465 g 970 no 2016 699 latest check

The price is, of course, an important factor in any camera decision. The listed launch prices provide an indication of the market segment that the manufacturer of the cameras have been targeting. The 800D was launched at a markedly lower price (by 79 percent) than the 5D Mark III, 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: Canon 800D vs Canon 5D Mark III

The imaging sensor is at the core of digital cameras and its size is one of the main determining factors 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. 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.

Of the two cameras under consideration, the Canon 800D features an APS-C sensor and the Canon 5D Mark III a full frame sensor. The sensor area in the 5D Mark III is 160 percent bigger. As a result of these sensor size differences, the cameras have a format factor of, respectively, 1.6 and 1.0. Both cameras have a native aspect ratio (sensor width to sensor height) of 3:2.

Canon 800D and Canon 5D Mark III sensor measures
Sensor size

Despite having a smaller sensor, the Canon 800D offers a higher resolution of 24 megapixel, compared with 22.1 MP of the Canon 5D Mark III. 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 3.72μm versus 6.25μm for the 5D Mark III). However, it should be noted that the 800D is much more recent (by 4 years and 11 months) than the 5D Mark III, and its sensor will have benefitted from technological advances during this time that make it possible to gather light more efficiently.

800D versus 5D Mark III MP
Sensor resolution

Consistent information on actual sensor performance is available from DXO Mark for most cameras. 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. The table below summarizes the physical sensor characteristics and sensor quality findings and compares them across a set of similar cameras.

Sensor Characteristics
Camera Sensor
Class
Resolution
(Megapixel)
Horiz.
Pixels
Vert.
Pixels
Video
Format
DXO
Portrait
DXO
Landscape
DXO
Sports
DXO
Overall
Canon 800D (⇒ rgt) APS-C 24.0 6000 4000 1080/60p .. .. .. ..
Canon 5D Mark III (⇒ lft) Full Frame 22.1 5760 3840 1080/30p 24 11.7 2293 81
Canon 2000D (⇒ lft | rgt) APS-C 24.0 6000 4000 1080/30p .. .. .. ..
Canon 200D (⇒ lft | rgt) APS-C 24.0 6000 4000 1080/60p 23.6 13.4 1041 79
Canon 77D (⇒ lft | rgt) APS-C 24.0 6000 4000 1080/60p .. .. .. ..
Canon M6 (⇒ lft | rgt) APS-C 24.0 6000 4000 1080/60p .. .. .. ..
Canon 1300D (⇒ lft | rgt) APS-C 17.9 5184 3456 1080/30p - - - -
Canon 5D Mark IV (⇒ lft | rgt) Full Frame 30.1 6720 4480 4K/30p 24.8 13.6 2995 91
Canon G7 X Mark II (⇒ lft | rgt) 1-inch 20.0 5472 3648 1080/60p - - - -
Canon 750D (⇒ lft | rgt) APS-C 24.0 6000 4000 1080/60p 22.7 12.0 919 71
Canon 760D (⇒ lft | rgt) APS-C 24.0 6000 4000 1080/30p 22.6 12.0 915 70
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 700D (⇒ lft | rgt) APS-C 17.9 5184 3456 1080/30p 21.7 11.2 681 61
Canon 6D (⇒ lft | rgt) Full Frame 20.0 5472 3648 1080/30p 23.8 12.1 2340 82
Canon 5D Mark II (⇒ lft | rgt) Full Frame 21.0 5616 3744 1080/30p 23.7 11.9 1815 79
Nikon D5600 (⇒ lft | rgt) APS-C 24.0 6000 4000 1080/60p 24.1 14.0 1306 84

Many modern cameras are not only capable of taking still images, but can also record movies. The two cameras under consideration both have sensors whose read-out speed is fast enough to capture moving pictures, but the 800D provides a higher frame rate than the 5D Mark III. It can shoot video footage at 1080/60p, while the 5D Mark III is limited to 1080/30p.

Feature comparison: Canon 800D vs Canon 5D Mark III

Apart from body and sensor, cameras can and do differ across a range of features. The 800D and the 5D Mark III 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 800D and Canon 5D Mark III 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 800D (⇒ rgt) optical no 3.0 1040 swivel YES 4000 6.0 12 no
Canon 5D Mark III (⇒ lft) optical YES 3.2 1040 fixed no 8000 6.0 no no
Canon 2000D (⇒ lft | rgt) optical no 3.0 920 fixed no 4000 3.0 9.2 no
Canon 200D (⇒ lft | rgt) optical no 3.0 1040 swivel YES 4000 5.0 9.8 no
Canon 77D (⇒ lft | rgt) optical YES 3.0 1040 swivel YES 4000 6.0 12 no
Canon M6 (⇒ lft | rgt) no no 3.0 1040 tilting YES 4000 9.0 5 no
Canon 1300D (⇒ lft | rgt) optical no 3.0 920 fixed no 4000 3.0 9.2 no
Canon 5D Mark IV (⇒ lft | rgt) optical YES 3.2 1620 fixed YES 8000 7.0 no no
Canon G7 X Mark II (⇒ lft | rgt) no no 3.0 1040 tilting YES 2000 8.0 7 YES
Canon 750D (⇒ lft | rgt) optical no 3.0 1040 swivel YES 4000 5.0 12 no
Canon 760D (⇒ lft | rgt) optical YES 3.0 1040 swivel YES 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 700D (⇒ lft | rgt) optical no 3.0 1040 swivel YES 4000 5.0 13 no
Canon 6D (⇒ lft | rgt) optical YES 3.0 1040 fixed no 4000 4.5 no no
Canon 5D Mark II (⇒ lft | rgt) optical YES 3.0 920 fixed no 8000 3.9 no no
Nikon D5600 (⇒ lft | rgt) optical no 3.2 1037 swivel YES 4000 5.0 12 no

The 800D is a current model that online retailers, such as amazon, will have in stock. In contrast, the 5D Mark III has been discontinued (but it can be found pre-owned on eBay). As a replacement in the same line of cameras, the 5D Mark III was succeeded by the Canon 5D Mark IV.

Review summary: Canon 800D vs Canon 5D Mark III

So how do things add up? Which of the two cameras – the Canon 800D or the Canon 5D Mark III – has the upper hand? The listing below highlights the relative strengths of the two models.


Arguments in favor of the Canon EOS 800D:

  • Better video: Provides higher movie framerates (1080/60p versus 1080/30p).
  • More flexible LCD: Has swivel screen for odd-angle shots in portrait or landscape orientation.
  • Fewer buttons to press: Is equipped with a touch-sensitive rear screen to facilitate handling.
  • More compact: Is smaller (131x100mm vs 152x116mm) and thus needs less room in the bag.
  • Less heavy: Is lighter (by 418g or 44 percent) and hence easier to carry around.
  • Easier fill-in: Is equipped with a small onboard flash to brighten deep shadow areas.
  • More affordable: Was introduced into a lower priced category (79 percent cheaper at launch).
  • More modern: Reflects 4 years and 11 months of technical progress since the 5D Mark III launch.

Advantages of the Canon EOS 5D Mark III:

  • Easier setting verification: Has a control panel on top to check shooting parameters.
  • Larger screen: Has a bigger rear LCD (3.2" vs 3.0") for image review and settings control.
  • Faster shutter: Has higher mechanical shutter speed (8000/sec vs 4000/sec) to freeze action.
  • Longer lasting: Gets more shots (950 versus 600) out of a single battery charge.
  • Better sealing: Is splash and dust sealed for shooting in inclement weather conditions.
  • More heavily discounted: Has been around for much longer (launched in March 2012).

If the number of relative strengths (bullet points above) is taken as a guide, the 800D emerges as the winner of the contest (8 : 6 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 when reflecting and deciding on a new camera.

800D 08:06 5D Mark III

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 800D or the 5D Mark III. 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 detailed reviews can be accessed, respectively, on the websites of cameralabs.com, dpreview.com, ephotozine.com, imaging-resource.com, and photographyblog.com.

Review scores
Camera camera
labs
.com
dp
review
.com
ephoto
zine
.com
imaging
resource
.com
photography
blog
.com
Camera
Launch
(year)
Launch
Price
(USD)
Street
Price
(amazon)
Used
Price
(ebay)
Canon 800D (⇒ rgt) .. 80/100 Gold 4.5/5 4/5 4/5 2017 749 latest check
Canon 5D Mark III (⇒ lft) HiRec 82/100 Gold 4.5/5 5/5 4.5/5 2012 3,499discont. check
Canon 2000D (⇒ lft | rgt) reviewed .. 3.5/5 .. 3.5/5 2018 449 latest check
Canon 200D (⇒ lft | rgt) HiRec 78/100 Silver 4.5/5 4.5/5 4.5/5 2017 549 latest check
Canon 77D (⇒ lft | rgt) .. 82/100 Silver 4.5/5 4.5/5 4/5 2017 899 latest check
Canon M6 (⇒ lft | rgt) - 80/100 Silver 4/5 4.5/5 4/5 2017 779 latest check
Canon 1300D (⇒ lft | rgt) reviewed 73/100 4/5 3.5/5 4/5 2016 449discont. 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 G7 X Mark II (⇒ lft | rgt) HiRec 81/100 Silver 4.5/5 4/5 4.5/5 2016 699 latest check
Canon 750D (⇒ lft | rgt) - 75/100 4.5/5 4.5/5 4.5/5 2015 749discont. check
Canon 760D (⇒ lft | rgt) Rec 77/100 Silver 4.5/5 4.5/5 4.5/5 2015 849discont. 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 700D (⇒ lft | rgt) - 76/100 Silver 4.5/5 4.5/5 4.5/5 2013 649discont. 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 II (⇒ lft | rgt) 91/100 79/100 HiRec 4/5 5/5 - 2008 3,499discont. check
Nikon D5600 (⇒ lft | rgt) - 79/100 Silver 4.5/5 4.5/5 4/5 2016 699 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. Thus, a score needs to be put into the context of the launch date and the launch price of the camera, and comparing ratings of very distinct cameras or ones that are far apart in terms of their release date have little meaning. Also, please note that some of the review sites have changed their methodology and reporting over time.


Other camera comparisons

Did this review help to inform your camera decision process? In case you would like to check on the differences and similarities of other camera models, just use the search menu below. Alternatively, you can follow any of the listed hyperlinks for comparisons that others found interesting. If you do not see the camera that you are looking for, please send me an email, and I will try to add information on that model to the database.

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