Canon 100D vs Olympus E-M1

The Canon EOS 100D (called Canon SL1 in some regions) and the Olympus OM-D E-M1 are two digital cameras that were revealed to the public, respectively, in March 2013 and September 2013. The 100D is a DSLR, while the E-M1 is a mirrorless interchangeable lens camera. The cameras are based on an APS-C (100D) and a Four Thirds (E-M1) sensor. The Canon has a resolution of 17.9 megapixels, whereas the Olympus provides 15.9 MP.

Below is an overview of the main specs of the two cameras as a starting point for the comparison.

Headline Specifications

	VS
Canon 100D		Olympus E-M1
Digital single lens reflex		Mirrorless system camera
Canon EF mount lenses		Micro Four Thirds lenses
17.9 MP, APS-C Sensor		15.9 MP, Four Thirds Sensor
1080/30p Video		1080/30p Video
ISO 100-12800 (100-25600)		ISO 200-25600
Optical viewfinder		Electronic viewfinder (2360k dots)
3.0" LCD, 1040k dots		3.0" LCD, 1037k dots
Fixed touchscreen		Tilting touchscreen
4.9 shutter flaps per second		10 shutter flaps per second
Lens stabilization only		In-body stabilization
Not weather sealed		Weathersealed body
380 shots per battery charge		350 shots per battery charge
117 x 91 x 69 mm, 407 g		130 x 94 x 63 mm, 497 g

Going beyond this snapshot of core features and characteristics, what are the differences between the Canon EOS 100D and the Olympus OM-D E-M1? Which one should you buy? Read on to find out how these two cameras compare with respect to their body size, their imaging sensors, their shooting features, their input-output connections, and their reception by expert reviewers.

Body comparison

The side-by-side display below illustrates the physical size and weight of the Canon 100D and the Olympus E-M1. The two cameras are presented according to their relative size. Three consecutive perspectives from the front, the top, and the back are available. All width, height and depth measures are rounded to the nearest millimeter.

The 100D can be obtained in two different colors (black, white), while the E-M1 is also available in two color-versions, but different ones (black, silver).

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Olympus E-M1 is notably larger (15 percent) than the Canon 100D. Moreover, the E-M1 is markedly heavier (22 percent) than the 100D. It is noteworthy in this context that the E-M1 is splash and dust-proof, while the 100D 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 will tend to go along with bigger and heavier lenses, although exceptions exist. You can compare the optics available for the two cameras in the Canon EF Lens Catalog (100D) and the Micro Four Thirds Lens Catalog (E-M1). Mirrorless cameras, such as the E-M1, have moreover the advantage that they can use many lenses from other systems via adapters, as they have a relatively short flange to focal plane distance.

Concerning battery life, the 100D gets 380 shots out of its LP-E12 battery, while the E-M1 can take 350 images on a single charge of its BLN-1 power pack.

The following table provides a synthesis of the main physical specifications of the two cameras and other similar ones. If you would like to visualize and compare a different camera combination, just use the right or left arrows in the table to switch to the respective camera. Alternatively, you can also navigate to the CAM-parator app and make your selection from the full list of cameras there.

Camera Body Specifications

	Camera Model	Camera Width	Camera Height	Camera Depth	Camera Weight	Battery Life (CIPA)	Weather Sealing (yes/no)	Camera Launch (announced)	Launch Price (USD)	Street Price (USD)	Camera Model
	Canon 100D»	4.6 in	3.6 in	2.7 in	14.4 oz	380	n	Mar 2013	549		Canon 100D
	Olympus E-M1«	5.1 in	3.7 in	2.5 in	17.5 oz	350	Y	Sep 2013	1,399		Olympus E-M1
	Canon 4000D« »	5.1 in	4.0 in	3.0 in	15.4 oz	500	n	Feb 2018	399		Canon 4000D
	Canon 200D« »	4.8 in	3.7 in	2.8 in	16.0 oz	650	n	Jun 2017	549		Canon 200D
	Canon 7D II« »	5.9 in	4.4 in	3.1 in	32.1 oz	670	Y	Sep 2014	1,799		Canon 7D II
	Canon 1200D« »	5.1 in	3.9 in	3.1 in	16.9 oz	500	n	Feb 2014	449		Canon 1200D
	Canon 700D« »	5.2 in	3.9 in	3.1 in	20.5 oz	440	n	Mar 2013	649		Canon 700D
	Canon G16« »	4.3 in	3.0 in	1.6 in	12.6 oz	360	n	Aug 2013	549		Canon G16
	Canon 650D« »	5.2 in	3.9 in	3.1 in	20.3 oz	440	n	Jun 2012	849		Canon 650D
	Canon M« »	4.3 in	2.6 in	1.3 in	10.5 oz	230	n	Jul 2012	599		Canon M
	Canon 600D« »	5.2 in	3.9 in	3.1 in	20.1 oz	440	n	Feb 2011	599		Canon 600D
	Olympus E-M1 II« »	5.3 in	3.6 in	2.6 in	20.2 oz	440	Y	Sep 2016	1,999		Olympus E-M1 II
	Olympus PEN-F« »	4.9 in	2.8 in	1.5 in	15.1 oz	330	n	Jan 2016	1,199		Olympus PEN-F
	Olympus E-M5 II« »	4.9 in	3.3 in	1.8 in	16.5 oz	310	Y	Feb 2015	1,099		Olympus E-M5 II
	Olympus E-P5« »	4.8 in	2.7 in	1.5 in	14.8 oz	330	n	May 2013	999		Olympus E-P5
	Olympus E-M5« »	4.8 in	3.5 in	1.7 in	15.0 oz	360	Y	Feb 2012	1,299		Olympus E-M5
	Panasonic G6« »	4.8 in	3.3 in	2.8 in	13.8 oz	340	n	Apr 2013	599		Panasonic G6
Convert to Metric
Note: Measurements and pricing do not include easily detachable parts, such as interchangeable lenses or optional viewfinders.

Any camera decision will obviously take relative prices into account. The manufacturer’s suggested retail prices give an idea on the placement of the camera in the maker’s lineup and the broader market. The 100D was launched at a markedly lower price (by 61 percent) than the E-M1, 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. All other things equal, a large sensor will have larger individual pixel-units that offer better low-light sensitivity, wider dynamic range, and richer color-depth than smaller pixels in a sensor of the same technological generation. Furthermore, a large sensor camera will give the photographer more possibilities to use shallow depth-of-field in order to isolate a subject from the background. On the downside, larger sensors tend to be more expensive and lead to bigger and heavier cameras and lenses.

Of the two cameras under consideration, the Canon 100D features an APS-C sensor and the Olympus E-M1 a Four Thirds sensor. The sensor area in the E-M1 is 32 percent smaller. As a result of these sensor size differences, the cameras have a format factor of, respectively, 1.6 and 2.0. The sensor in the 100D has a native 3:2 aspect ratio, while the one in the E-M1 offers a 4:3 aspect.

Technology-wise, both cameras are equipped with CMOS (Complementary Metal–Oxide–Semiconductor) sensors.

With 17.9MP, the 100D offers a higher resolution than the E-M1 (15.9MP), but the 100D nevertheless has larger individual pixels (pixel pitch of 4.31μm versus 3.76μm for the E-M1) due to its larger sensor. However, the E-M1 is a somewhat more recent model (by 5 months) than the 100D, 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 E-M1 has no anti-alias filter installed, so that it can capture all the detail its sensor resolves.

The resolution advantage of the Canon 100D implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the 100D for good quality output (200 dots per inch) amounts to 25.9 x 17.3 inch or 65.8 x 43.9 cm, for very good quality (250 dpi) 20.7 x 13.8 inch or 52.7 x 35.1 cm, and for excellent quality (300 dpi) 17.3 x 11.5 inch or 43.9 x 29.3 cm. The corresponding values for the Olympus E-M1 are 23 x 17.3 inch or 58.5 x 43.9 cm for good quality, 18.4 x 13.8 inch or 46.8 x 35.1 cm for very good quality, and 15.4 x 11.5 inch or 39 x 29.3 cm for excellent quality prints.

The Canon EOS 100D has a native sensitivity range from ISO 100 to ISO 12800, which can be extended to ISO 100-25600. The corresponding ISO settings for the Olympus OM-D E-M1 are ISO 200 to ISO 25600, with the possibility to increase the ISO range to 100-25600.

For many cameras, data on sensor performance has been reported by DXO Mark. 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 E-M1 has a markedly higher DXO score than the 100D (overall score 10 points higher), which will translate into better image quality. The advantage is based on 1.2 bits higher color depth, 1.4 EV in additional dynamic range, and 0.2 stops of reduced 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.

Many modern cameras cannot only take still pictures, but also record videos. Both cameras under consideration are equipped with sensors that have a sufficiently high read-out speed for moving images, and both provide the same movie specifications (1080/30p).

Feature comparison

Apart from body and sensor, cameras can and do differ across a range of features. For example, the E-M1 has an electronic viewfinder (2360k dots), while the 100D has an optical one. Both systems have their advantages, with the electronic viewfinder making it possible to project supplementary shooting information into the framing view, whereas the optical viewfinder offers lag-free viewing and a very clear framing image. The viewfinder in the E-M1 offers a wider field of view (100%) than the one in the 100D (95%), so that a larger proportion of the captured image is visible in the finder. In addition, the viewfinder of the E-M1 has a higher magnification (0.74x vs 0.54x), so that the size of the image transmitted appears closer to the size seen with the naked human eye. The following table reports on some other key feature differences and similarities of the Canon 100D, the Olympus E-M1, and comparable cameras.

One difference between the cameras concerns the presence of an on-board flash. The 100D has one, while the E-M1 does not. While the built-in flash of the 100D is not very powerful, it can at times be useful as a fill-in light.

The reported shutter speed information refers to the use of the mechanical shutter. Yet, some cameras only have an electronic shutter, while others have an electronic shutter in addition to a mechanical one. In fact, the E-M1 is one of those camera that have an additional electronic shutter, which makes completely silent shooting possible. However, this mode is less suitable for photographing moving objects (risk of rolling shutter) or shooting under artificial light sources (risk of flickering).

The Olympus E-M1 has an intervalometer built-in. This enables the photographer to capture time lapse sequences, such as flower blooming, a sunset or moon rise, without purchasing an external camera trigger and related software.

Concerning the storage of imaging data, both the 100D and the E-M1 write their files to SDXC cards. Both cameras can use UHS-I cards, which provide for Ultra High Speed data transfer of up to 104 MB/s.

Connectivity comparison

For some imaging applications, the extent to which a camera can communicate with its environment can be an important aspect in the camera decision process. The table below provides an overview of the connectivity of the Canon EOS 100D and Olympus OM-D E-M1 and, in particular, the interfaces the cameras (and selected comparators) provide for accessory control and data transfer.

It is notable that the E-M1 offers wifi support, which can be a very convenient means to transfer image data to an off-camera location. In contrast, the 100D does not offer wifi capability.

Studio photographers will appreciate that the Olympus E-M1 (unlike the 100D) features a PC Sync socket, so that professional strobe lights can be controlled by the camera.

Both the 100D and the E-M1 have been discontinued, but can regularly be found used on eBay. The 100D was replaced by the Canon 200D, while the E-M1 was followed by the Olympus E-M1 II. Further information on the two cameras (e.g. user guides, manuals), as well as related accessories, can be found on the official Canon and Olympus websites.

Review summary

So what conclusions can be drawn? Is there a clear favorite between the Canon 100D and the Olympus E-M1? Which camera is better? The listing below highlights the relative strengths of the two models.

Arguments in favor of the Canon EOS 100D:

• More detail: Offers more megapixels (17.9 vs 15.9MP) with a 8% higher linear resolution.
• Better moiré control: Has an anti-alias filter to avoid artificial patterns to appear in images.
• Brighter framing: Features an optical viewfinder for clear, lag-free composition.
• More compact: Is smaller (117x91mm vs 130x94mm) and thus needs less room in the bag.
• Less heavy: Is lighter (by 90g or 18 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 (61 percent cheaper at launch).
• More heavily discounted: Has been on the market for longer (launched in March 2013).

Reasons to prefer the Olympus OM-D E-M1:

• Maximized detail: Lacks an anti-alias filter to exploit the sensor's full resolution potential.
• Better image quality: Scores markedly higher (10 points) in the DXO overall evaluation.
• Richer colors: Generates noticeably more natural colors (1.2 bits more color depth).
• More dynamic range: Captures a broader range of light and dark details (1.4 EV of extra DR).
• More framing info: Has an electronic viewfinder that displays shooting data.
• More complete view: Has a viewfinder with a larger field of view (100% vs 95%).
• Larger viewfinder image: Features a viewfinder with a higher magnification (0.74x vs 0.54x).
• More flexible LCD: Has a tilting screen for odd-angle shots in landscape orientation.
• Faster shutter: Has higher mechanical shutter speed (1/8000s vs 1/4000s) to freeze action.
• Faster burst: Shoots at higher frequency (10 vs 4.9 flaps/sec) to capture the decisive moment.
• Less disturbing: Has an electronic shutter option for completely silent shooting.
• Easier time-lapse photography: Has an intervalometer built-in for low frequency shooting.
• Better sealing: Is splash and dust sealed for shooting in inclement weather conditions.
• Sharper images: Has stabilization technology built-in to reduce the impact of hand-shake.
• More legacy lens friendly: Can use many non-native lenses via adapters.
• Easier file upload: Has wifi built in for automatic backup or image transfer to the web.
• Better studio light control: Has a PC Sync socket to connect to professional strobe lights.
• More modern: Was introduced somewhat (5 months) more recently.

If the count of relative strengths (bullet points above) is taken as a measure, the E-M1 is the clear winner of the contest (18 : 8 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. A professional wedding photographer will view the differences between cameras in a way that diverges from the perspective of a travel photog, and a person interested in cityscapes has distinct needs from a macro shooter. Hence, the decision which camera is best and worth buying is often a very personal one.

How about other alternatives? Do the specifications of the Canon 100D and the Olympus E-M1 place the cameras among the top in their class? Find out in the latest Best DSLR Camera and Best Mirrorless Interchangeable Lens Camera listings whether the two cameras rank among the cream of the crop.

In any case, while the specs-based evaluation of cameras can be instructive in revealing their potential as photographic tools, it says little about, for example, the shooting experience and imaging performance of the 100D and the E-M1 in practical situations. User reviews that are available, for instance, at amazon can sometimes shed light on these issues, but such feedback is all too often partial, inconsistent, and inaccurate.

Expert reviews

This is why hands-on reviews by experts are important. The adjacent summary-table relays the overall verdicts of several of the most popular camera review sites (cameralabs, dpreview, ephotozine, imaging-resource, and photographyblog). As can be seen, the professional reviewers agree in many cases on the quality of different cameras, but sometimes their assessments diverge, reinforcing the earlier point that a camera decision is often a very personal choice.

Review Scores

	Camera Model	cam era   labs	dp re   view	e photo   zine	ima ging resource	photo graphy   blog	Camera Launch (announced)	Launch Price (USD)	Street Price (USD)	Camera Model
	Canon 100D	+	78/100	4/5	4/5	4/5	Mar 2013	549		Canon 100D
	Olympus E-M1	+ +	84/100	4.5/5	4.5/5	4.5/5	Sep 2013	1,399		Olympus E-M1
	Canon 4000D	o	..	3.5/5	..	3.5/5	Feb 2018	399		Canon 4000D
	Canon 200D	+ +	78/100	4.5/5	4.5/5	4.5/5	Jun 2017	549		Canon 200D
	Canon 7D II	+	84/100	4/5	5/5	4.5/5	Sep 2014	1,799		Canon 7D II
	Canon 1200D	+	..	4/5	4/5	4.5/5	Feb 2014	449		Canon 1200D
	Canon 700D	..	76/100	4.5/5	4.5/5	4.5/5	Mar 2013	649		Canon 700D
	Canon G16	+	..	4.5/5	4.5/5	4.5/5	Aug 2013	549		Canon G16
	Canon 650D	+ +	77/100	4.5/5	4.5/5	4.5/5	Jun 2012	849		Canon 650D
	Canon M	+	..	4/5	3.5/5	4/5	Jul 2012	599		Canon M
	Canon 600D	o	77/100	4.5/5	5/5	4.5/5	Feb 2011	599		Canon 600D
	Olympus E-M1 II	+ +	85/100	4.5/5	5/5	4.5/5	Sep 2016	1,999		Olympus E-M1 II
	Olympus PEN-F	..	82/100	4.5/5	4.5/5	5/5	Jan 2016	1,199		Olympus PEN-F
	Olympus E-M5 II	+ +	81/100	5/5	4.5/5	5/5	Feb 2015	1,099		Olympus E-M5 II
	Olympus E-P5	+ +	78/100	4.5/5	4.5/5	5/5	May 2013	999		Olympus E-P5
	Olympus E-M5	+ +	80/100	4.5/5	5/5	5/5	Feb 2012	1,299		Olympus E-M5
	Panasonic G6	+ +	..	5/5	..	4.5/5	Apr 2013	599		Panasonic G6
Notes: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available.

The review scores listed above should be treated with care, though. The ratings are only valid when referring 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. It should also be noted that some of the review sites have over time altered the way they render their verdicts.

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. As an alternative, you can also directly jump to any one of the listed comparisons that were previously generated by the CAM-parator tool.

Specifications: Canon 100D vs Olympus E-M1

Below is a side-by-side comparison of the specs of the two cameras to facilitate a quick review of their differences and common features.

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