Canon 100D vs G3X

The Canon EOS 100D (called Canon SL1 in some regions) and the Canon PowerShot G3 X are two digital cameras that were revealed to the public, respectively, in March 2013 and June 2015. The 100D is a DSLR, while the G3X is a fixed lens compact. The cameras are based on an APS-C (100D) and an one-inch (G3X) sensor. The 100D has a resolution of 17.9 megapixels, whereas the G3X provides 20 MP.

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

Headline Specifications

Canon 100D		Canon G3 X
Digital single lens reflex		Fixed lens compact camera
Canon EF mount lenses		24-600mm f/2.8-5.6
17.9 MP – APS-C sensor		20 MP – 1" sensor
1080/30p Video		1080/60p Video
ISO 100-12,800 (100 - 25,600)		ISO 125-12,800 (125 - 25,600)
Optical viewfinder		Viewfinder optional
3.0" LCD – 1040k dots		3.2" LCD – 1620k dots
Fixed touchscreen		Tilting touchscreen
4.9 shutter flaps per second		5.9 shutter flaps per second
not weather sealed		Weathersealed body
380 shots per battery charge		300 shots per battery charge
117 x 91 x 69 mm, 407 g		123 x 77 x 105 mm, 733 g

Check 100D offers at
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Check G3X price at
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Going beyond this snapshot of core features and characteristics, what are the differences between the Canon EOS 100D and the Canon PowerShot G3 X? 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

An illustration of the physical size and weight of the Canon 100D and the Canon G3 X is provided in the side-by-side display below. The two cameras are presented according to their relative size. Three consecutive perspectives from the front, the top, and the back are available. All size dimensions are rounded to the nearest millimeter.

The 100D can be obtained in two different colors (black, white), while the G3X is only available in black.

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Canon G3 X is notably smaller (11 percent) than the Canon 100D. It is noteworthy in this context that the G3X 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 and possibly misleading, as the G3X has a lens built in, whereas the 100D is an interchangeable lens camera that requires a separate lens. Attaching the latter will add extra weight and bulk to the setup. You can compare the optics available for the 100D and their specifications in the Canon EF Lens Catalog.

Concerning battery life, the 100D gets 380 shots out of its LP-E12 battery, while the G3X can take 300 images on a single charge of its NB-10L power pack.

The adjacent table lists the principal physical characteristics of the two cameras alongside a wider set of alternatives. 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 (USD)	Street Price
1.		Canon 100D	117 mm	91 mm	69 mm	407 g	380	n	Mar 2013	549	ebay.com
2.		Canon G3 X	123 mm	77 mm	105 mm	733 g	300	Y	Jun 2015	999	amazon.com
3.		Canon 4000D	129 mm	102 mm	77 mm	436 g	500	n	Feb 2018	399	amazon.com
4.		Canon 200D	122 mm	93 mm	70 mm	453 g	650	n	Jun 2017	549	ebay.com
5.		Canon 80D	139 mm	105 mm	79 mm	730 g	960	Y	Feb 2016	1,199	ebay.com
6.		Canon G9 X	98 mm	58 mm	31 mm	209 g	220	n	Oct 2015	529	ebay.com
7.		Canon 7D II	149 mm	112 mm	78 mm	910 g	670	Y	Sep 2014	1,799	ebay.com
8.		Canon 1200D	130 mm	100 mm	78 mm	480 g	500	n	Feb 2014	449	ebay.com
9.		Canon G7 X	103 mm	60 mm	40 mm	304 g	210	n	Sep 2014	699	ebay.com
10.		Canon 70D	139 mm	104 mm	79 mm	755 g	920	Y	Jul 2013	1,199	ebay.com
11.		Canon 700D	133 mm	100 mm	79 mm	580 g	440	n	Mar 2013	649	ebay.com
12.		Canon G16	109 mm	76 mm	40 mm	356 g	360	n	Aug 2013	549	ebay.com
13.		Canon 650D	133 mm	100 mm	79 mm	575 g	440	n	Jun 2012	849	ebay.com
14.		Canon M	109 mm	66 mm	32 mm	298 g	230	n	Jul 2012	599	ebay.com
15.		Canon 600D	133 mm	100 mm	80 mm	570 g	440	n	Feb 2011	599	ebay.com
16.		Panasonic FZ1000	137 mm	99 mm	131 mm	831 g	360	n	Jun 2014	899	ebay.com
17.		Panasonic G6	122 mm	85 mm	71 mm	390 g	340	n	Apr 2013	599	ebay.com
Note: Measurements and pricing do not include easily detachable parts, such as add-on or interchangeable lenses or optional viewfinders.
Convert to Imperial

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. 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 imaging sensor is a crucial determinant 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 Canon G3 X an one-inch sensor. The sensor area in the G3X is 65 percent smaller. As a result of these sensor size differences, the cameras have a format factor of, respectively, 1.6 and 2.7. Both cameras have a native aspect ratio (sensor width to sensor height) of 3:2.

Technology-wise, the G3X uses a more advanced image processing engine (DIGIC 6) than the 100D (DIGIC 5), with benefits for noise reduction, color accuracy, and processing speed.

Despite having a smaller sensor, the G3X offers a higher resolution of 20 megapixels, compared with 17.9 MP of the 100D. This megapixels advantage comes at the cost of a higher pixel density and a smaller size of the individual pixel (with a pixel pitch of 2.41μm versus 4.31μm for the 100D). However, it should be noted that the G3X is much more recent (by 2 years and 2 months) than the 100D, and its sensor will have benefitted from technological advances during this time that make it possible to gather light more efficiently.

The resolution advantage of the Canon G3 X implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the G3X for good quality output (200 dots per inch) amounts to 27.4 x 18.2 inches or 69.5 x 46.3 cm, for very good quality (250 dpi) 21.9 x 14.6 inches or 55.6 x 37.1 cm, and for excellent quality (300 dpi) 18.2 x 12.2 inches or 46.3 x 30.9 cm. The corresponding values for the Canon 100D are 25.9 x 17.3 inches or 65.8 x 43.9 cm for good quality, 20.7 x 13.8 inches or 52.7 x 35.1 cm for very good quality, and 17.3 x 11.5 inches or 43.9 x 29.3 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 Canon PowerShot G3 X are ISO 125 to ISO 12800, with the possibility to increase the ISO range to 125-25600.

In terms of underlying technology, the 100D is build around a CMOS sensor, while the G3X uses a BSI-CMOS imager. 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 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"). The Overall DXO ratings for the two cameras under consideration are close, suggesting that they provide similar imaging performance. 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 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.		Canon G3 X	1-inch	20.0	5472	3648	1080/60p	21.4	12.3	521	63
3.		Canon 4000D	APS-C	17.9	5184	3456	1080/30p	21.9	11.4	695	63
4.		Canon 200D	APS-C	24.0	6000	4000	1080/60p	23.6	13.4	1041	79
5.		Canon 80D	APS-C	24.0	6000	4000	1080/60p	23.6	13.2	1135	79
6.		Canon G9 X	1-inch	20.0	5472	3648	1080/60p	21.5	12.3	495	63
7.		Canon 7D II	APS-C	20.0	5472	3648	1080/60p	22.4	11.8	1082	70
8.		Canon 1200D	APS-C	17.9	5184	3456	1080/30p	21.9	11.3	724	63
9.		Canon G7 X	1-inch	20.0	5472	3648	1080/60p	23.0	12.7	556	71
10.		Canon 70D	APS-C	20.0	5472	3648	1080/30p	22.5	11.6	926	68
11.		Canon 700D	APS-C	17.9	5184	3456	1080/30p	21.7	11.2	681	61
12.		Canon G16	1/1.7	12.0	4000	3000	1080/60p	21.0	11.7	230	54
13.		Canon 650D	APS-C	17.9	5184	3456	1080/30p	21.7	11.2	722	62
14.		Canon M	APS-C	17.9	5184	3456	1080/30p	22.1	11.2	827	65
15.		Canon 600D	APS-C	17.9	5184	3456	1080/30p	22.1	11.5	793	65
16.		Panasonic FZ1000	1-inch	20.0	5472	3648	4K/30p	22.1	11.7	517	64
17.		Panasonic G6	Four Thirds	15.9	4608	3456	1080/60p	21.3	11.5	639	61

Many modern cameras cannot only take still pictures, but also record videos. Both cameras under consideration have a sensor with sufficiently fast read-out times for moving pictures, but the G3X provides a faster frame rate than the 100D. It can shoot movie footage at 1080/60p, while the 100D is limited to 1080/30p.

Feature comparison

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 G3X relies on live view and the rear LCD for framing. That said, the G3X can be equipped with an optional viewfinder – the EVF-DC1. The adjacent table lists some of the other core features of the Canon 100D and Canon G3 X 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.		Canon G3 X	optional	n	3.2 / 1620	tilting	Y	1/2000s	5.9/s	Y	Y
3.		Canon 4000D	optical	n	2.7 / 230	fixed	n	1/4000s	3.0/s	Y	n
4.		Canon 200D	optical	n	3.0 / 1040	swivel	Y	1/4000s	5.0/s	Y	n
5.		Canon 80D	optical	Y	3.0 / 1040	swivel	Y	1/8000s	7.0/s	Y	n
6.		Canon G9 X	none	n	3.0 / 1040	fixed	Y	1/2000s	6.0/s	Y	Y
7.		Canon 7D II	optical	Y	3.0 / 1040	fixed	n	1/8000s	10.0/s	Y	n
8.		Canon 1200D	optical	n	3.0 / 460	fixed	n	1/4000s	3.0/s	Y	n
9.		Canon G7 X	none	n	3.0 / 1040	tilting	Y	1/2000s	6.5/s	Y	Y
10.		Canon 70D	optical	Y	3.0 / 1040	swivel	Y	1/8000s	7.0/s	Y	n
11.		Canon 700D	optical	n	3.0 / 1040	swivel	Y	1/4000s	5.0/s	Y	n
12.		Canon G16	optical	n	3.0 / 922	fixed	n	1/4000s	2.2/s	Y	Y
13.		Canon 650D	optical	n	3.0 / 1040	swivel	Y	1/4000s	5.0/s	Y	n
14.		Canon M	none	n	3.0 / 1040	fixed	Y	1/4000s	4.3/s	n	n
15.		Canon 600D	optical	n	3.0 / 1040	swivel	n	1/4000s	3.7/s	Y	n
16.		Panasonic FZ1000	2359	n	3.0 / 921	swivel	n	1/4000s	12.0/s	Y	Y
17.		Panasonic G6	1440	n	3.0 / 1036	swivel	Y	1/4000s	7.0/s	Y	n
Notes: *) Information refers to the mechanical shutter, unless the camera only has an electronic one.

Concerning the storage of imaging data, both the 100D and the G3X 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 Canon PowerShot G3 X 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.		Canon G3 X	Y	stereo / mono	Y	Y	mini	2.0	Y	Y	-
3.		Canon 4000D	Y	mono / mono	-	-	mini	2.0	Y	Y	-
4.		Canon 200D	Y	stereo / mono	Y	-	mini	2.0	Y	Y	Y
5.		Canon 80D	Y	stereo / mono	Y	Y	mini	2.0	Y	Y	-
6.		Canon G9 X	-	stereo / mono	-	-	micro	2.0	Y	Y	-
7.		Canon 7D II	Y	stereo / mono	Y	Y	mini	3.0	-	-	-
8.		Canon 1200D	Y	mono / mono	-	-	mini	2.0	-	-	-
9.		Canon G7 X	-	stereo / mono	-	-	micro	2.0	Y	Y	-
10.		Canon 70D	Y	stereo / mono	Y	-	mini	2.0	Y	-	-
11.		Canon 700D	Y	stereo / mono	Y	-	mini	2.0	-	-	-
12.		Canon G16	Y	stereo / mono	-	-	mini	2.0	Y	-	-
13.		Canon 650D	Y	stereo / mono	Y	-	mini	2.0	-	-	-
14.		Canon M	Y	stereo / mono	Y	-	mini	2.0	-	-	-
15.		Canon 600D	Y	mono / mono	Y	-	mini	2.0	-	-	-
16.		Panasonic FZ1000	Y	stereo / mono	Y	-	micro	2.0	Y	Y	-
17.		Panasonic G6	Y	stereo / mono	Y	-	mini	2.0	Y	Y	-

It is notable that the G3X 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 provide wifi capability.

The G3X is a recent model that features in the current product line-up of Canon. In contrast, the 100D has been discontinued (but can be found pre-owned on ebay). As a replacement in the same line of cameras, the 100D was succeeded by the Canon 200D. Further information on the two cameras (e.g. user guides, manuals), as well as related accessories, can be found on the official Canon website.

Review summary

So how do things add up? Which of the two cameras – the Canon 100D or the Canon G3 X – has the upper hand? Is one clearly better than the other? Below is a summary of the relative strengths of each of the two contestants.

Arguments in favor of the Canon EOS 100D:

• Better low-light sensitivity: Requires less light for good images (0.7 stops ISO advantage).
• Better live-view autofocus: Features on-sensor phase-detection for more confident autofocus.
• Easier framing: Has an optical viewfinder for image composition and settings control.
• Faster shutter: Has higher mechanical shutter speed (1/4000s vs 1/2000s) to freeze action.
• More flexible: Can take a variety of interchangeable lenses, including specialty optics.
• Longer lasting: Can take more shots (380 versus 300) on a single battery charge.
• More heavily discounted: Has been available for much longer (launched in March 2013).

Advantages of the Canon PowerShot G3 X:

• More detail: Has more megapixels (20 vs 17.9MP), which boosts linear resolution by 6%.
• More dynamic range: Captures a broader range of light and dark details (1 EV of extra DR).
• Better jpgs: Has a more modern image processing engine (DIGIC 6 vs DIGIC 5).
• Better video: Provides higher movie framerates (1080/60p versus 1080/30p).
• Better sound control: Has a headphone port that enables audio monitoring while recording.
• 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 (1620k vs 1040k dots).
• More flexible LCD: Has a tilting screen for odd-angle shots in landscape orientation.
• More selfie-friendly: Has an articulated screen that can be turned to be front-facing.
• Faster burst: Shoots at higher frequency (5.9 vs 4.9 flaps/sec) to capture the decisive moment.
• Ready to shoot: Comes with an integrated lens, while the 100D requires a separate lens.
• More compact: Is smaller (123x77mm vs 117x91mm) and will fit more readily into a bag.
• 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.
• Easier file upload: Has wifi built in for automatic backup or image transfer to the web.
• Easier device pairing: Supports NFC for fast wireless image transfer over short distances.
• More modern: Reflects 2 years and 2 months of technical progress since the 100D launch.

If the number of relative strengths (bullet points above) is taken as a guide, the G3X is the clear winner of the contest (17 : 7 points). However, the pertinence of the various camera strengths will differ across photographers, so that you might want to weigh individual camera traits according to their importance for your own imaging needs before making a camera decision. 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 Canon G3 X place the cameras among the top in their class? Find out in the latest Best DSLR Camera and Best Superzoom 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 says little about, for example, the shooting experience and imaging performance of the 100D and the G3X 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.

Expert reviews

This is where reviews by experts come in. The table below provides a synthesis of the camera assessments of some of the best known photo-gear 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 (USD)	Street Price
1.		Canon 100D	4/5	+	..	78/100	4/5	4/5	Mar 2013	549	ebay.com
2.		Canon G3 X	3.5/5	+	..	..	4.5/5	4/5	Jun 2015	999	amazon.com
3.		Canon 4000D	..	o	3/5	..	3.5/5	3.5/5	Feb 2018	399	amazon.com
4.		Canon 200D	4/5	+ +	4/5	78/100	4.5/5	4.5/5	Jun 2017	549	ebay.com
5.		Canon 80D	4/5	+ +	4.5/5	84/100	4.5/5	4.5/5	Feb 2016	1,199	ebay.com
6.		Canon G9 X	3.5/5	+ +	..	..	4.5/5	4.5/5	Oct 2015	529	ebay.com
7.		Canon 7D II	4.5/5	+	3.5/5	84/100	4/5	4.5/5	Sep 2014	1,799	ebay.com
8.		Canon 1200D	3/5	+	..	..	4/5	4.5/5	Feb 2014	449	ebay.com
9.		Canon G7 X	4/5	+ +	..	77/100	4.5/5	4.5/5	Sep 2014	699	ebay.com
10.		Canon 70D	5/5	+ +	..	83/100	4.5/5	5/5	Jul 2013	1,199	ebay.com
11.		Canon 700D	..	..	..	76/100	4.5/5	4.5/5	Mar 2013	649	ebay.com
12.		Canon G16	4/5	+	..	..	4.5/5	4.5/5	Aug 2013	549	ebay.com
13.		Canon 650D	4/5	+ +	..	77/100	4.5/5	4.5/5	Jun 2012	849	ebay.com
14.		Canon M	3/5	+	..	..	4/5	4/5	Jul 2012	599	ebay.com
15.		Canon 600D	3/5	o	..	77/100	4.5/5	4.5/5	Feb 2011	599	ebay.com
16.		Panasonic FZ1000	4/5	+ +	..	82/100	4.5/5	4.5/5	Jun 2014	899	ebay.com
17.		Panasonic G6	4/5	+ +	..	..	5/5	4.5/5	Apr 2013	599	ebay.com
Notes: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available.

The above review scores should be interpreted with care, though. The assessments were made in relation to similar cameras of the same technological generation. A score, therefore, has to be seen in close connection to the price and market introduction time 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.

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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 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.

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