Canon 100D vs Olympus E-PM1

The Canon EOS 100D (called Canon SL1 in some regions) and the Olympus PEN E-PM1 are two digital cameras that were officially introduced, respectively, in March 2013 and June 2011. The 100D is a DSLR, while the E-PM1 is a mirrorless interchangeable lens camera. The cameras are based on an APS-C (100D) and a Four Thirds (E-PM1) sensor. The Canon has a resolution of 17.9 megapixels, whereas the Olympus provides 12.2 MP.

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

Headline Specifications

Canon 100D		Olympus E-PM1
Digital single lens reflex		Mirrorless system camera
Canon EF mount lenses		Micro Four Thirds lenses
17.9 MP – APS-C sensor		12.2 MP – Four Thirds sensor
1080/30p Video		1080/60i Video
ISO 100-12,800 (100 - 25,600)		ISO 100-12,800
Optical viewfinder		Viewfinder optional
3.0" LCD – 1040k dots		3.0" LCD – 460k dots
Fixed touchscreen		Fixed screen (not touch-sensitive)
4.9 shutter flaps per second		5.5 shutter flaps per second
Lens stabilization only		In-body stabilization
380 shots per battery charge		330 shots per battery charge
117 x 91 x 69 mm, 407 g		110 x 64 x 34 mm, 265 g

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Going beyond this snapshot of core features and characteristics, what are the differences between the Canon EOS 100D and the Olympus PEN E-PM1? 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-PM1. The two cameras are presented according to their relative size. Three successive views from the front, the top, and the rear are shown. All size dimensions are rounded to the nearest millimeter.

The 100D can be obtained in two different colors (black, white), while the E-PM1 is available in six color-versions (black, silver, brown, pink, purple, white).

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Olympus E-PM1 is considerably smaller (34 percent) than the Canon 100D. Moreover, the E-PM1 is substantially lighter (35 percent) than the 100D. In this context, it is worth noting that neither the 100D nor the E-PM1 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. 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-PM1). Mirrorless cameras, such as the E-PM1, 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 Canon LP-E12 battery, while the E-PM1 can take 330 images on a single charge of its Olympus BLS-5 power pack.

The table below summarizes the key physical specs of the two cameras alongside a broader set of comparators. If you would like to visualize and compare a different camera combination, you can navigate to the CAM-parator app and make your selection from a broad list of cameras there.

Body Specifications

		Camera Model	Camera Width	Camera Height	Camera Depth	Camera Weight	Battery Life	Weather Sealing	Camera Launch	Launch Price	Street Price
1.		Canon 100D	117 mm	91 mm	69 mm	407 g	380	n	Mar 2013	US$ 549	ebay.com
2.		Olympus E-PM1	110 mm	64 mm	34 mm	265 g	330	n	Jun 2011	US$ 499	ebay.com
3.		Canon 200D	122 mm	93 mm	70 mm	453 g	650	n	Jun 2017	US$ 549	ebay.com
4.		Canon 600D	133 mm	100 mm	80 mm	570 g	440	n	Feb 2011	US$ 599	ebay.com
5.		Canon 650D	133 mm	100 mm	79 mm	575 g	440	n	Jun 2012	US$ 849	ebay.com
6.		Canon 700D	133 mm	100 mm	79 mm	580 g	440	n	Mar 2013	US$ 649	ebay.com
7.		Canon 1200D	130 mm	100 mm	78 mm	480 g	500	n	Feb 2014	US$ 449	ebay.com
8.		Canon 1300D	129 mm	101 mm	78 mm	485 g	500	n	Mar 2016	US$ 449	ebay.com
9.		Canon 4000D	129 mm	102 mm	77 mm	436 g	500	n	Feb 2018	US$ 399	amazon.com
10.		Canon G16	109 mm	76 mm	40 mm	356 g	360	n	Aug 2013	US$ 549	ebay.com
11.		Canon M	109 mm	66 mm	32 mm	298 g	230	n	Jul 2012	US$ 599	ebay.com
12.		Olympus E-PL1	115 mm	72 mm	42 mm	334 g	290	n	Feb 2010	US$ 599	ebay.com
13.		Olympus E-PL2	114 mm	72 mm	42 mm	362 g	280	n	Jan 2011	US$ 599	ebay.com
14.		Olympus E-PL3	110 mm	64 mm	37 mm	313 g	300	n	Jun 2011	US$ 599	ebay.com
15.		Olympus E-PM2	110 mm	64 mm	34 mm	269 g	360	n	Sep 2012	US$ 499	ebay.com
16.		Panasonic G2	124 mm	84 mm	74 mm	428 g	360	n	Mar 2010	US$ 599	ebay.com
17.		Panasonic G6	122 mm	85 mm	71 mm	390 g	340	n	Apr 2013	US$ 599	ebay.com
Note: Measurements and pricing do not include easily detachable parts, such as add-on or interchangeable lenses or optional viewfinders.
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Any camera decision will naturally be influenced heavily by the price. The retail prices at the time of the camera’s release place the model in the market relative to other models in the producer’s line-up and the competition. The E-PM1 was somewhat cheaper (by 9 percent) than the 100D at launch, but both cameras fall into the same price category. 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.

Sensor comparison

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. 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 tend to 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-PM1 a Four Thirds sensor. The sensor area in the E-PM1 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-PM1 offers a 4:3 aspect.

With 17.9MP, the 100D offers a higher resolution than the E-PM1 (12.2MP), but the 100D nevertheless has marginally larger individual pixels (pixel pitch of 4.31μm versus 4.29μm for the E-PM1) due to its larger sensor. Moreover, the 100D is a somewhat more recent model (by 1 year and 8 months) than the E-PM1, and its sensor might have benefitted from technological advances during this time that further enhance the light gathering capacity of its pixels.

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 inches or 65.8 x 43.9 cm, for very good quality (250 dpi) 20.7 x 13.8 inches or 52.7 x 35.1 cm, and for excellent quality (300 dpi) 17.3 x 11.5 inches or 43.9 x 29.3 cm. The corresponding values for the Olympus E-PM1 are 20.2 x 15.1 inches or 51.2 x 38.4 cm for good quality, 16.1 x 12.1 inches or 41 x 30.7 cm for very good quality, and 13.4 x 10.1 inches or 34.1 x 25.6 cm for excellent quality prints.

The 100D has on-sensor phase detect pixels, which results in fast and reliable autofocus acquisition even during live view operation.

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 PEN E-PM1 are ISO 100 to ISO 12800 (no boost).

Technology-wise, both cameras are equipped with CMOS (Complementary Metal–Oxide–Semiconductor) sensors. Both cameras use a Bayer filter for capturing RGB colors on a square grid of photosensors. This arrangement is found in most digital cameras.

Consistent information on actual sensor performance is available from DXO Mark for many cameras. This service determines an overall sensor rating, as well as sub-scores for low-light sensitivity ("DXO Sports"), dynamic range ("DXO Landscape"), and color depth ("DXO Portrait"). Of the two cameras under review, the 100D provides substantially higher image quality than the E-PM1, with an overall score that is 11 points higher. This advantage is based on 0.8 bits higher color depth, 1 EV in additional dynamic range, and 0.8 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 Model	Sensor Class	Resolution (MP)	Horiz. Pixels	Vert. Pixels	Video Format	DXO Portrait	DXO Landscape	DXO Sports	DXO Overall
1.		Canon 100D	APS-C	17.9	5184	3456	1080/30p	21.8	11.3	843	63
2.		Olympus E-PM1	Four Thirds	12.2	4032	3024	1080/60i	21.0	10.3	499	52
3.		Canon 200D	APS-C	24.0	6000	4000	1080/60p	23.6	13.4	1041	79
4.		Canon 600D	APS-C	17.9	5184	3456	1080/30p	22.1	11.5	793	65
5.		Canon 650D	APS-C	17.9	5184	3456	1080/30p	21.7	11.2	722	62
6.		Canon 700D	APS-C	17.9	5184	3456	1080/30p	21.7	11.2	681	61
7.		Canon 1200D	APS-C	17.9	5184	3456	1080/30p	21.9	11.3	724	63
8.		Canon 1300D	APS-C	17.9	5184	3456	1080/30p	22.0	11.7	781	66
9.		Canon 4000D	APS-C	17.9	5184	3456	1080/30p	21.9	11.4	695	63
10.		Canon G16	1/1.7	12.0	4000	3000	1080/60p	21.0	11.7	230	54
11.		Canon M	APS-C	17.9	5184	3456	1080/30p	22.1	11.2	827	65
12.		Olympus E-PL1	Four Thirds	12.2	4032	3024	720/30p	21.5	10.1	487	54
13.		Olympus E-PL2	Four Thirds	12.2	4032	3024	720/30p	21.4	10.2	573	55
14.		Olympus E-PL3	Four Thirds	12.2	4032	3024	1080/60i	20.9	10.3	499	52
15.		Olympus E-PM2	Four Thirds	15.9	4608	3456	1080/30p	22.7	12.2	932	72
16.		Panasonic G2	Four Thirds	12.0	4000	3000	720/30p	21.2	10.3	493	53
17.		Panasonic G6	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, but the E-PM1 provides a faster frame rate than the 100D. It can shoot movie footage at 1080/60i, while the Canon is limited to 1080/30p.

Feature comparison

Apart from body and sensor, cameras can and do differ across a variety of features. For example, the 100D has an optical viewfinder, which can be very useful when shooting in bright sunlight. In contrast, the E-PM1 relies on live view and the rear LCD for framing. That said, the E-PM1 can be equipped with an optional viewfinder – the VF-2. The adjacent table lists some of the other core features of the Canon 100D and Olympus E-PM1 along with similar information for a selection of comparators.

Core Features

		Camera Model	Viewfinder (Type or 000 dots)	Control Panel (yes/no)	LCD Specifications (inch/000 dots)	LCD Attach- ment	Touch Screen (yes/no)	Max Shutter Speed *	Max Shutter Flaps *	Built-in Flash (yes/no)	Built-in Image Stab
1.		Canon 100D	optical	n	3.0 / 1040	fixed	Y	1/4000s	4.9/s	Y	n
2.		Olympus E-PM1	optional	n	3.0 / 460	fixed	n	1/4000s	5.5/s	n	Y
3.		Canon 200D	optical	n	3.0 / 1040	swivel	Y	1/4000s	5.0/s	Y	n
4.		Canon 600D	optical	n	3.0 / 1040	swivel	n	1/4000s	3.7/s	Y	n
5.		Canon 650D	optical	n	3.0 / 1040	swivel	Y	1/4000s	5.0/s	Y	n
6.		Canon 700D	optical	n	3.0 / 1040	swivel	Y	1/4000s	5.0/s	Y	n
7.		Canon 1200D	optical	n	3.0 / 460	fixed	n	1/4000s	3.0/s	Y	n
8.		Canon 1300D	optical	n	3.0 / 920	fixed	n	1/4000s	3.0/s	Y	n
9.		Canon 4000D	optical	n	2.7 / 230	fixed	n	1/4000s	3.0/s	Y	n
10.		Canon G16	optical	n	3.0 / 922	fixed	n	1/4000s	2.2/s	Y	Y
11.		Canon M	none	n	3.0 / 1040	fixed	Y	1/4000s	4.3/s	n	n
12.		Olympus E-PL1	optional	n	2.7 / 230	fixed	n	1/2000s	3.0/s	Y	Y
13.		Olympus E-PL2	optional	n	3.0 / 460	fixed	n	1/4000s	3.0/s	Y	Y
14.		Olympus E-PL3	optional	n	3.0 / 460	tilting	n	1/4000s	5.5/s	n	Y
15.		Olympus E-PM2	optional	n	3.0 / 460	fixed	Y	1/4000s	8.0/s	n	Y
16.		Panasonic G2	1440	n	3.0 / 460	swivel	Y	1/4000s	2.6/s	Y	n
17.		Panasonic G6	1440	n	3.0 / 1036	swivel	Y	1/4000s	7.0/s	Y	n
Note: *) Information refers to the mechanical shutter, unless the camera only has an electronic one.

One difference between the cameras concerns the presence of an on-board flash. The 100D has one, while the E-PM1 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.

Concerning the storage of imaging data, both the 100D and the E-PM1 write their files to SDXC cards. The 100D supports UHS-I cards (Ultra High Speed data transfer of up to 104 MB/s), while the E-PM1 cannot take advantage of Ultra High Speed SD cards.

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 PEN E-PM1 and, in particular, the interfaces the cameras (and selected comparators) provide for accessory control and data transfer.

Input-Output Connections

		Camera Model	Hotshoe Port	Internal Mic / Speaker	Microphone Port	Headphone Port	HDMI Port	USB Port	WiFi Support	NFC Support	Bluetooth Support
1.		Canon 100D	Y	mono / mono	Y	-	mini	2.0	-	-	-
2.		Olympus E-PM1	Y	stereo / mono	-	-	mini	2.0	-	-	-
3.		Canon 200D	Y	stereo / mono	Y	-	mini	2.0	Y	Y	Y
4.		Canon 600D	Y	mono / mono	Y	-	mini	2.0	-	-	-
5.		Canon 650D	Y	stereo / mono	Y	-	mini	2.0	-	-	-
6.		Canon 700D	Y	stereo / mono	Y	-	mini	2.0	-	-	-
7.		Canon 1200D	Y	mono / mono	-	-	mini	2.0	-	-	-
8.		Canon 1300D	Y	mono / mono	-	-	mini	2.0	Y	Y	-
9.		Canon 4000D	Y	mono / mono	-	-	mini	2.0	Y	Y	-
10.		Canon G16	Y	stereo / mono	-	-	mini	2.0	Y	-	-
11.		Canon M	Y	stereo / mono	Y	-	mini	2.0	-	-	-
12.		Olympus E-PL1	Y	stereo / -	-	-	mini	2.0	-	-	-
13.		Olympus E-PL2	Y	stereo / -	-	-	mini	2.0	-	-	-
14.		Olympus E-PL3	Y	stereo / -	-	-	mini	2.0	-	-	-
15.		Olympus E-PM2	Y	stereo / mono	-	-	mini	2.0	-	-	-
16.		Panasonic G2	Y	stereo / mono	-	-	mini	2.0	-	-	-
17.		Panasonic G6	Y	stereo / mono	Y	-	mini	2.0	Y	Y	-

It is notable that the 100D has a microphone port, which is missing on the E-PM1. Such an external microphone input can help to substantially improve the quality of audio recordings when a good external microphone is used.

Both the 100D and the E-PM1 have been discontinued, but can regularly be found used on ebay. The E-PM1 was replaced by the Olympus E-PM2, while the 100D was followed by the Canon 200D. Further information on the features and operation of the 100D and E-PM1 can be found, respectively, in the Canon 100D Manual (free pdf) or the online Olympus E-PM1 Manual.

Review summary

So what conclusions can be drawn? Is there a clear favorite between the Canon 100D and the Olympus E-PM1? Which camera is better? Below is a summary of the relative strengths of each of the two contestants.

Advantages of the Canon EOS 100D:

• More detail: Offers more megapixels (17.9 vs 12.2MP) with a 24% higher linear resolution.
• Better image quality: Scores substantially higher (11 points) in the DXO overall assessment.
• More dynamic range: Captures a larger spectrum of light and dark details (1 EV of extra DR).
• Better low-light sensitivity: Requires less light for good images (0.8 stops ISO advantage).
• Better live-view autofocus: Features on-sensor phase-detection for more confident autofocus.
• Better sound: Can connect to an external microphone for higher quality sound recording.
• Easier framing: Has an optical viewfinder for image composition and settings control.
• More detailed LCD: Has a higher resolution rear screen (1040k vs 460k dots).
• Fewer buttons to press: Is equipped with a touch-sensitive rear screen to facilitate handling.
• Longer lasting: Can take more shots (380 versus 330) on a single battery charge.
• Easier fill-in: Is equipped with a small onboard flash to brighten deep shadow areas.
• Faster buffer clearing: Has an SD card interface that supports the UHS-I standard.
• More modern: Is somewhat more recent (announced 1 year and 8 months after the E-PM1).

Arguments in favor of the Olympus PEN E-PM1:

• Better video: Provides higher movie framerates (1080/60i versus 1080/30p).
• Faster burst: Shoots at higher frequency (5.5 vs 4.9 flaps/sec) to capture the decisive moment.
• More compact: Is smaller (110x64mm vs 117x91mm) and will fit more readily into a bag.
• Less heavy: Has a lower weight (by 142g or 35 percent) and is thus easier to take along.
• 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.
• More heavily discounted: Has been on the market for longer (launched in June 2011).

If the number of relative strengths (bullet points above) is taken as a guide, the 100D is the clear winner of the match-up (13 : 7 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 wildlife photographer will view the differences between cameras in a way that diverges from the perspective of a family photog, and a person interested in architecture has distinct needs from a sports 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-PM1 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 comparison of technical specifications can provide a useful overview of the capabilities of different cameras, it remains partial and cannot reveal, for example, the shooting experience and imaging performance when actually working with the 100D or the E-PM1. 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 where reviews by experts come in. The adjacent summary-table relays the overall verdicts of several of the most popular camera review sites (amateurphotographer [AP], cameralabs [CL], digitalcameraworld [DCW], dpreview [DPR], ephotozine [EPZ], photographyblog [PB]). 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.

Expert Camera Reviews

		Camera   Model	AP   score	CL   score	DCW   score	DPR   score	EPZ   score	PB   score	Camera Launch	Launch Price	Street Price
1.		Canon 100D	4/5	+	..	78/100	4/5	4/5	Mar 2013	US$ 549	ebay.com
2.		Olympus E-PM1	..	86/100	..	71/100	4.5/5	4.5/5	Jun 2011	US$ 499	ebay.com
3.		Canon 200D	4/5	+ +	4/5	78/100	4.5/5	4.5/5	Jun 2017	US$ 549	ebay.com
4.		Canon 600D	3/5	o	..	77/100	4.5/5	4.5/5	Feb 2011	US$ 599	ebay.com
5.		Canon 650D	4/5	+ +	..	77/100	4.5/5	4.5/5	Jun 2012	US$ 849	ebay.com
6.		Canon 700D	..	..	..	76/100	4.5/5	4.5/5	Mar 2013	US$ 649	ebay.com
7.		Canon 1200D	3/5	+	..	..	4/5	4.5/5	Feb 2014	US$ 449	ebay.com
8.		Canon 1300D	4/5	o	4/5	73/100	4/5	4/5	Mar 2016	US$ 449	ebay.com
9.		Canon 4000D	2.5/5	o	3/5	..	3.5/5	3.5/5	Feb 2018	US$ 399	amazon.com
10.		Canon G16	4/5	+	..	..	4.5/5	4.5/5	Aug 2013	US$ 549	ebay.com
11.		Canon M	3/5	+	..	..	4/5	4/5	Jul 2012	US$ 599	ebay.com
12.		Olympus E-PL1	..	86/100	..	69/100	4/5	4.5/5	Feb 2010	US$ 599	ebay.com
13.		Olympus E-PL2	3/5	83/100	..	71/100	4.5/5	4.5/5	Jan 2011	US$ 599	ebay.com
14.		Olympus E-PL3	3/5	+ +	..	72/100	4.5/5	4/5	Jun 2011	US$ 599	ebay.com
15.		Olympus E-PM2	3/5	..	..	77/100	5/5	4.5/5	Sep 2012	US$ 499	ebay.com
16.		Panasonic G2	..	..	..	72/100	4/5	4.5/5	Mar 2010	US$ 599	ebay.com
17.		Panasonic G6	4/5	+ +	..	..	5/5	4.5/5	Apr 2013	US$ 599	ebay.com
Note: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available.

The above review scores should be interpreted 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 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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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. As an alternative, you can also directly jump to any one of the listed comparisons that were previously generated by the CAM-parator tool.

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