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Canon 100D versus Canon M3

The Canon EOS 100D (called Canon SL1 in some regions) and the Canon EOS M3 are two digital cameras that were announced, respectively, in March 2013 and February 2015. The 100D is a DSLR, while the M3 is a mirrorless interchangeable lens camera. Both cameras are equipped with an APS-C sensor. The 100D has a resolution of 17.9 megapixel, whereas the M3 provides 24 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 100D vs Canon M3

The side-by-side display below illustrates the physical size and weight of the Canon 100D and the Canon M3. Three successive views from the front, the top, and the rear are shown. All size 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 100D – represents the basis for the calculations across all the size and weight measures).

Compare Canon 100D vs Canon M3
100D versus M3 top view
100D and M3 rear side

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Canon M3 is notably smaller (29 percent) than the Canon 100D. Moreover, the M3 is markedly lighter (10 percent) than the 100D. In this context, it is worth noting that neither the 100D nor the M3 are weather-sealed.

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.

Concerning battery life, the 100D gets 380 shots out of its LP-E12 battery, while the M3 can take 250 images on a single charge of its LP-E17 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 100D (⇒ rgt) 4.6 in 3.6 in 2.7 in 14.4 oz 380 no 2013 549discont. check
Canon M3 (⇒ lft) 4.4 in 2.7 in 1.7 in 12.9 oz 250 no 2015 679discont. check
Canon 200D (⇒ lft | rgt) 4.8 in 3.7 in 2.8 in 16.0 oz 650 no 2017 549 latest check
Canon M100 (⇒ lft | rgt) 4.3 in 2.6 in 1.4 in 10.7 oz 295 no 2017 499 latest check
Canon M6 (⇒ lft | rgt) 4.4 in 2.7 in 1.8 in 13.8 oz 295 no 2017 779 latest check
Canon M5 (⇒ lft | rgt) 4.6 in 3.5 in 2.4 in 15.1 oz 295 no 2016 979 latest check
Canon T6i (⇒ lft | rgt) 5.2 in 4.0 in 3.1 in 19.6 oz 440 no 2015 749discont. check
Canon 1200D (⇒ lft | rgt) 5.1 in 3.9 in 3.1 in 16.9 oz 500 no 2014 449discont. check
Canon 700D (⇒ lft | rgt) 5.2 in 3.9 in 3.1 in 20.5 oz 440 no 2013 649discont. check
Canon 70D (⇒ lft | rgt) 5.5 in 4.1 in 3.1 in 26.6 oz 920 YES 2013 1,199discont. check
Canon G16 (⇒ lft | rgt) 4.3 in 3.0 in 1.6 in 12.6 oz 360 no 2013 549 latest check
Canon M (⇒ lft | rgt) 4.3 in 2.6 in 1.3 in 10.5 oz 230 no 2012 599discont. check
Canon 650D (⇒ lft | rgt) 5.2 in 3.9 in 3.1 in 20.3 oz 440 no 2012 849discont. check
Canon 600D (⇒ lft | rgt) 5.2 in 3.9 in 3.1 in 20.1 oz 440 no 2011 599discont. check
Canon 500D (⇒ lft | rgt) 5.1 in 3.9 in 2.4 in 18.3 oz 400 no 2009 799discont. check
Panasonic G6 (⇒ lft | rgt) 4.8 in 3.3 in 2.8 in 13.8 oz 340 no 2013 599discont. 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 100D was launched at a somewhat lower price (by 19 percent) than the M3, which makes it more attractive for photographers on a tight budget. 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 100D vs Canon M3

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 tend to be more expensive and lead to bigger and heavier cameras and lenses.

Both cameras under consideration feature an APS-C sensor and have a format factor (sometimes also referred to as "crop factor") of 1.6. Within the spectrum of camera sensors, this places the review cameras among the medium-sized sensor cameras that aim to strike a balance between image quality and portability. Both cameras have a native aspect ratio (sensor width to sensor height) of 3:2.

Canon 100D and Canon M3 sensor measures

While the two cameras under review share the same sensor size, the M3 offers a higher resolution of 24 megapixel, compared with 17.9 MP of the 100D. This megapixel advantage translates into a 16 percent gain in linear resolution. On the other hand, these sensor specs imply that the M3 has a higher pixel density and a smaller size of the individual pixel (with a pixel pitch of 3.72μm versus 4.31μm for the 100D). However, it should be noted that the M3 is a somewhat more recent model (by 1 year and 10 months) than the 100D, and its sensor might have benefitted from technological advances during this time that at least partly compensate for the smaller pixel size.

100D versus M3 MP

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 consideration, the M3 has a markedly higher DXO score than the 100D (overall score 9 points higher), which will translate into better image quality. The advantage is based on 1 bits higher color depth, 0.5 EV in additional dynamic range, and 0.5 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.

Sensor Characteristics
Camera Sensor
Class
Resolution
(Megapixel)
Horiz.
Pixels
Vert.
Pixels
Video
Format
DXO
Portrait
DXO
Landscape
DXO
Sports
DXO
Overall
Canon 100D (⇒ rgt) APS-C 17.9 5184 3456 1080/30p 21.8 11.3 843 63
Canon M3 (⇒ lft) APS-C 24.0 6000 4000 1080/30p 22.8 11.8 1169 72
Canon 200D (⇒ lft | rgt) APS-C 24.0 6000 4000 1080/60p 23.6 13.4 1041 79
Canon M100 (⇒ lft | rgt) APS-C 24.0 6000 4000 1080/60p 23.5 12.9 1272 78
Canon M6 (⇒ lft | rgt) APS-C 24.0 6000 4000 1080/60p .. .. .. ..
Canon M5 (⇒ lft | rgt) APS-C 24.0 6000 4000 1080/60p 23.4 12.4 1262 77
Canon T6i (⇒ lft | rgt) APS-C 24.0 6000 4000 1080/60p 22.7 12.0 919 71
Canon 1200D (⇒ lft | rgt) APS-C 17.9 5184 3456 1080/30p 21.9 11.3 724 63
Canon 700D (⇒ lft | rgt) APS-C 17.9 5184 3456 1080/30p 21.7 11.2 681 61
Canon 70D (⇒ lft | rgt) APS-C 20.0 5472 3648 1080/30p 22.5 11.6 926 68
Canon G16 (⇒ lft | rgt) 1/1.7 12.0 4000 3000 1080/60p 21.0 11.7 230 54
Canon M (⇒ lft | rgt) APS-C 17.9 5184 3456 1080/30p 22.1 11.2 827 65
Canon 650D (⇒ lft | rgt) APS-C 17.9 5184 3456 1080/30p 21.7 11.2 722 62
Canon 600D (⇒ lft | rgt) APS-C 17.9 5184 3456 1080/30p 22.1 11.5 793 65
Canon 500D (⇒ lft | rgt) APS-C 15.1 4752 3168 1080/20p 21.7 11.5 663 63
Panasonic G6 (⇒ lft | rgt) Four Thirds 15.9 4608 3456 1080/60p 21.3 11.5 639 61

Many modern cameras are not only capable of taking still images, but can also record movies. Both cameras under consideration have a sensor with sufficiently fast read-out times for moving pictures, and both provide the same movie specifications (1080/30p).

Feature comparison: Canon 100D vs Canon M3

Apart from body and sensor, cameras can and do differ across a range of features. For example, the 100D has an optical viewfinder, which can be very useful when shooting in bright sunlight. In contrast, the M3 relies on live view and the rear LCD for framing. The table below summarizes some of the other core capabilities of the Canon 100D and Canon M3 in connection with corresponding information for a sample of similar cameras. The full specs-sheets can be found in the camera manual or, 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 100D (⇒ rgt) optical no 3.0 1040 fixed YES 4000 4.9 9.4 no
Canon M3 (⇒ lft) no no 3.0 1040 tilting YES 4000 4.2 5 no
Canon 200D (⇒ lft | rgt) optical no 3.0 1040 swivel YES 4000 5.0 9.8 no
Canon M100 (⇒ lft | rgt) no no 3.0 1040 tilting YES 4000 6.1 5 no
Canon M6 (⇒ lft | rgt) no no 3.0 1040 tilting YES 4000 9.0 5 no
Canon M5 (⇒ lft | rgt) 2360 no 3.2 1620 tilting YES 4000 9.0 5 no
Canon T6i (⇒ lft | rgt) optical no 3.0 1040 swivel YES 4000 5.0 12 no
Canon 1200D (⇒ lft | rgt) optical no 3.0 460 fixed no 4000 3.0 9.2 no
Canon 700D (⇒ lft | rgt) optical no 3.0 1040 swivel YES 4000 5.0 13 no
Canon 70D (⇒ lft | rgt) optical YES 3.0 1040 swivel YES 8000 7.0 12 no
Canon G16 (⇒ lft | rgt) optical no 3.0 922 fixed no 4000 2.2 7 YES
Canon M (⇒ lft | rgt) no no 3.0 1040 fixed YES 4000 4.3 no no
Canon 650D (⇒ lft | rgt) optical no 3.0 1040 swivel YES 4000 5.0 YES no
Canon 600D (⇒ lft | rgt) optical no 3.0 1040 swivel no 4000 3.7 YES no
Canon 500D (⇒ lft | rgt) optical no 3.0 920 fixed no 4000 3.4 YES no
Panasonic G6 (⇒ lft | rgt) 1440 no 3.0 1036 swivel YES 4000 7.0 10.5 no

Both the 100D and the M3 have been discontinued, but can regularly be found used on eBay. The 100D was replaced by the Canon 200D, while the M3 was followed by the Canon M6.

Review summary: Canon 100D vs Canon M3

So how do things add up? Is the Canon 100D better than the Canon M3 or vice versa? The listing below highlights the relative strengths of the two models.


Advantages of the Canon EOS 100D:

  • Easier framing: Has an optical viewfinder for image framing and settings control.
  • Faster burst: Shoots at higher frequency (4.9 vs 4.2 flaps/sec) to capture the decisive moment.
  • Longer lasting: Can take more shots (380 versus 250) on a single battery charge.
  • More affordable: Was introduced into a lower priced segment (19 percent cheaper at launch).
  • More heavily discounted: Has been on the market for longer (launched in March 2013).

Reasons to prefer the Canon EOS M3:

  • More detail: Has more megapixels (24 vs 17.9MP), which boosts linear resolution by 16%.
  • Better image quality: Scores markedly higher (9 points) in the DXO overall evaluation.
  • Better low-light sensitivity: Can shoot in dim conditions (0.5 stops ISO advantage).
  • More flexible LCD: Has a tilting screen for odd-angle shots in landscape orientation.
  • More compact: Is smaller (111x68mm vs 117x91mm) and will fit more readily into a bag.
  • More legacy lens friendly: Can use many non-native lenses via adapters.
  • More modern: Was introduced somewhat (1 year and 10 months) more recently.

If the count of individual advantages (bullet points above) is taken as a guide, the M3 emerges as the winner of the match-up (7 : 5 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.

100D 05:07 M3

In any case, while the specs-based evaluation of cameras is instructive in revealing their potential as photographic tools, it says nothing about, for example, the handling, responsiveness, and overall imaging quality of the 100D and the M3 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 table below summarizes the assessments of some of the best known camera review sites (cameralabs, dpreview, ephotozine, imaging-resource, photographyblog). The full reviews are available by clicking on the site logo in the table header.

Review scores
Camera cameralabs dpreview ephotozine imaging-resource photographyblog Camera
Launch
(year)
Launch
Price
(USD)
Street
Price
(amazon)
Used
Price
(ebay)
Canon 100D (⇒ rgt) Rec 78/100 Gold 4/5 4/5 4/5 2013 549discont. check
Canon M3 (⇒ lft) reviewed 75/100 4.5/5 4.5/5 4/5 2015 679discont. check
Canon 200D (⇒ lft | rgt) HiRec 78/100 Silver 4.5/5 4.5/5 4.5/5 2017 549 latest check
Canon M100 (⇒ lft | rgt) Rec .. 4/5 .. 3.5/5 2017 499 latest check
Canon M6 (⇒ lft | rgt) - 80/100 Silver 4/5 4.5/5 4/5 2017 779 latest check
Canon M5 (⇒ lft | rgt) Rec 82/100 Silver 4/5 4.5/5 4/5 2016 979 latest check
Canon T6i (⇒ lft | rgt) - 75/100 4.5/5 4.5/5 4.5/5 2015 749discont. check
Canon 1200D (⇒ lft | rgt) 4/5 - 4/5 4/5 4.5/5 2014 449discont. check
Canon 700D (⇒ lft | rgt) - 76/100 Silver 4.5/5 4.5/5 4.5/5 2013 649discont. check
Canon 70D (⇒ lft | rgt) HiRec 83/100 Gold 4.5/5 4.5/5 5/5 2013 1,199discont. check
Canon G16 (⇒ lft | rgt) Rec - 4.5/5 4.5/5 4.5/5 2013 549 latest check
Canon M (⇒ lft | rgt) Rec - 4/5 3.5/5 4/5 2012 599discont. check
Canon 650D (⇒ lft | rgt) HiRec 77/100 Silver 4.5/5 4.5/5 4.5/5 2012 849discont. check
Canon 600D (⇒ lft | rgt) reviewed 77/100 Silver 4.5/5 5/5 4.5/5 2011 599discont. check
Canon 500D (⇒ lft | rgt) 88/100 HiRec 74/100 HiRec 4.5/5 5/5 4.5/5 2009 799discont. check
Panasonic G6 (⇒ lft | rgt) HiRec - 5/5 - 4.5/5 2013 599discont. check

The review scores listed above should be treated with care, though. The ratings are only valid when refering to cameras in the same category and of the same age. A score, therefore, has to be seen in close connection to the price and market introduction time of the camera, and comparisons of ratings among very different cameras or across long time periods 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 are interested in seeing how other cameras pair up, just make your choice using the following search menu. 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 the camera you are interested in is not available, please send me an email, and I will try to update the database with the necessary infos.

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