Canon 1D Mark III vs M3

The Canon EOS-1D Mark III and the Canon EOS M3 are two digital cameras that were announced, respectively, in February 2007 and February 2015. The 1D Mark III is a DSLR, while the M3 is a mirrorless interchangeable lens camera. The cameras are based on an APS-H (1D Mark III) and an APS-C (M3) sensor. The 1D Mark III has a resolution of 10.1 megapixels, whereas the M3 provides 24 MP.

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

Headline Specifications

Canon 1D Mark III		Canon M3
Digital single lens reflex		Mirrorless system camera
Canon EF mount lenses		Canon EF-M mount lenses
10.1 MP – APS-H sensor		24 MP – APS-C sensor
no Video		1080/30p Video
ISO 100-3,200 (50 - 6,400)		ISO 100-12,800 (100 - 25,600)
Optical viewfinder		Viewfinder optional
3.0" LCD – 230k dots		3.0" LCD – 1040k dots
Fixed screen (not touch-sensitive)		Tilting touchscreen
10 shutter flaps per second		4.2 shutter flaps per second
Weathersealed body		not weather sealed
2200 shots per battery charge		250 shots per battery charge
156 x 157 x 80 mm, 1155 g		111 x 68 x 44 mm, 366 g

Check 1D Mark III offers at
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Check M3 offers at
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Going beyond this snapshot of core features and characteristics, what are the differences between the Canon EOS-1D Mark III and the Canon EOS M3? 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 1D Mark III and the Canon M3. The two cameras are presented according to their relative size. Three consecutive views from the front, the top, and the rear side are shown. All width, height and depth dimensions are rounded to the nearest millimeter.

The M3 can be obtained in two different colors (black, white), while the 1D Mark III 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 M3 is considerably smaller (69 percent) than the Canon 1D Mark III. Moreover, the M3 is substantially lighter (68 percent) than the 1D Mark III. It is worth mentioning in this context that the 1D Mark III is splash and dust resistant, while the M3 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. Hence, you might want to study and compare 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 1D Mark III gets 2200 shots out of its Canon LP-E4 battery, while the M3 can take 250 images on a single charge of its Canon LP-E17 power pack. As can be seen in the images above, the 1D Mark III has a battery grip built in. This facilitates image-taking in portrait orientation and gives it additional battery power.

The following table provides a synthesis of the main physical specifications of the two cameras and other similar ones. If you want to switch the focus of the display and review another camera pair, you can move across to the CAM-parator tool and choose from the broad selection of possible camera comparisons 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 1D Mark III	156 mm	157 mm	80 mm	1155 g	2200	Y	Feb 2007	EUR 4 309	ebay.com
2.		Canon M3	111 mm	68 mm	44 mm	366 g	250	n	Feb 2015	EUR 749	ebay.com
3.		Canon 1D Mark II	156 mm	158 mm	80 mm	1535 g	1200	Y	Jan 2004	EUR 4 499	ebay.com
4.		Canon 1D Mark IV	156 mm	157 mm	80 mm	1230 g	1500	Y	Oct 2009	EUR 4 699	ebay.com
5.		Canon 1Ds	156 mm	158 mm	80 mm	1265 g	600	Y	Sep 2002	EUR 8 999	ebay.com
6.		Canon 1Ds Mark III	150 mm	160 mm	80 mm	1385 g	1800	Y	Aug 2007	EUR 7 999	ebay.com
7.		Canon 5D Mark II	152 mm	114 mm	75 mm	850 g	850	Y	Sep 2008	EUR 3 299	ebay.com
8.		Canon 5D Mark III	152 mm	116 mm	76 mm	950 g	950	Y	Mar 2012	EUR 3 299	ebay.com
9.		Canon 5DS R	152 mm	116 mm	76 mm	930 g	700	Y	Feb 2015	EUR 3 699	ebay.com
10.		Canon G7 X	103 mm	60 mm	40 mm	304 g	210	n	Sep 2014	EUR 649	ebay.com
11.		Canon M	109 mm	66 mm	32 mm	298 g	230	n	Jul 2012	EUR 599	ebay.com
12.		Canon M5	116 mm	89 mm	61 mm	427 g	295	n	Sep 2016	EUR 1 129	ebay.com
13.		Canon M6	112 mm	68 mm	45 mm	390 g	295	n	Feb 2017	EUR 799	ebay.com
14.		Canon M10	108 mm	67 mm	35 mm	301 g	255	n	Oct 2015	EUR 499	ebay.com
15.		Nikon D2Xs	158 mm	150 mm	86 mm	1252 g	3800	Y	Jun 2006	EUR 5 069	ebay.com
16.		Nikon D3	160 mm	157 mm	88 mm	1300 g	4300	Y	Aug 2007	EUR 4 849	ebay.com
17.		Nikon D3S	160 mm	157 mm	88 mm	1240 g	4200	Y	Oct 2009	EUR 4 999	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

Any camera decision will obviously take relative prices into account. The listed launch prices provide an indication of the market segment that the manufacturer of the cameras have been targeting. The M3 was launched at a markedly lower price (by 85 percent) than the 1D 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.

Sensor comparison

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 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 tend to be associated with larger, more expensive camera bodies and lenses.

Of the two cameras under consideration, the Canon 1D Mark III features an APS-H sensor and the Canon M3 an APS-C sensor. The sensor area in the M3 is 37 percent smaller. As a result of these sensor size differences, the cameras have a format factor of, respectively, 1.3 and 1.6. Both cameras have a native aspect ratio (sensor width to sensor height) of 3:2.

Technology-wise, the M3 uses a more advanced image processing engine (DIGIC 6) than the 1D Mark III (DIGIC III), with benefits for noise reduction, color accuracy, and processing speed.

Despite having a smaller sensor, the M3 offers a higher resolution of 24 megapixels, compared with 10.1 MP of the 1D Mark III. 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 3.72μm versus 7.21μm for the 1D Mark III). However, it should be noted that the M3 is much more recent (by 7 years and 11 months) than the 1D Mark III, 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 M3 implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the M3 for good quality output (200 dots per inch) amounts to 30 x 20 inches or 76.2 x 50.8 cm, for very good quality (250 dpi) 24 x 16 inches or 61 x 40.6 cm, and for excellent quality (300 dpi) 20 x 13.3 inches or 50.8 x 33.9 cm. The corresponding values for the Canon 1D Mark III are 19.4 x 13 inches or 49.4 x 32.9 cm for good quality, 15.6 x 10.4 inches or 39.5 x 26.3 cm for very good quality, and 13 x 8.6 inches or 32.9 x 21.9 cm for excellent quality prints.

The M3 has on-sensor phase detect pixels, which results in fast and reliable autofocus acquisition even during live view operation.

The Canon EOS-1D Mark III has a native sensitivity range from ISO 100 to ISO 3200, which can be extended to ISO 50-6400. The corresponding ISO settings for the Canon EOS M3 are ISO 100 to ISO 12800, with the possibility to increase the ISO range to 100-25600.

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.

Since 2007, DXO Mark has published sensor performance measurements that have been derived using a consistent methodology. 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 Overall DXO ratings for the two cameras under consideration are close, suggesting that they provide similar imaging performance. 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 1D Mark III	APS-H	10.1	3888	2592	none	22.7	11.7	1078	71
2.		Canon M3	APS-C	24.0	6000	4000	1080/30p	22.8	11.8	1169	72
3.		Canon 1D Mark II	APS-H	8.2	3504	2336	none	22.3	11.1	1003	66
4.		Canon 1D Mark IV	APS-H	16.0	4896	3264	1080/30p	22.8	12.0	1320	74
5.		Canon 1Ds	Full Frame	11.0	4064	2704	none	21.8	11.0	954	63
6.		Canon 1Ds Mark III	Full Frame	21.0	5616	3744	none	24.0	12.0	1663	80
7.		Canon 5D Mark II	Full Frame	21.0	5616	3744	1080/30p	23.7	11.9	1815	79
8.		Canon 5D Mark III	Full Frame	22.1	5760	3840	1080/30p	24.0	11.7	2293	81
9.		Canon 5DS R	Full Frame	50.3	8688	5792	1080/30p	24.6	12.4	2308	86
10.		Canon G7 X	1-inch	20.0	5472	3648	1080/60p	23.0	12.7	556	71
11.		Canon M	APS-C	17.9	5184	3456	1080/30p	22.1	11.2	827	65
12.		Canon M5	APS-C	24.0	6000	4000	1080/60p	23.4	12.4	1262	77
13.		Canon M6	APS-C	24.0	6000	4000	1080/60p	23.4	12.6	1317	78
14.		Canon M10	APS-C	17.9	5184	3456	1080/30p	22.2	11.4	753	65
15.		Nikon D2Xs	APS-C	12.2	4288	2848	none	22.2	10.9	489	59
16.		Nikon D3	Full Frame	12.1	4256	2832	none	23.5	12.2	2290	81
17.		Nikon D3S	Full Frame	12.1	4256	2832	720/24p	23.5	12.0	3253	82

Many modern cameras are not only capable of taking still images, but can also record movies. The M3 indeed provides for movie recording, while the 1D Mark III does not. The highest resolution format that the M3 can use is 1080/30p.

Feature comparison

Apart from body and sensor, cameras can and do differ across a range of features. For example, the 1D Mark III 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. That said, the M3 can be equipped with an optional viewfinder – the EVF-DC1. The adjacent table lists some of the other core features of the Canon 1D Mark III and Canon M3 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 1D Mark III	optical	Y	3.0 / 230	fixed	n	1/8000s	10.0/s	n	n
2.		Canon M3	optional	n	3.0 / 1040	tilting	Y	1/4000s	4.2/s	Y	n
3.		Canon 1D Mark II	optical	Y	2.0 / 230	fixed	n	1/8000s	8.3/s	n	n
4.		Canon 1D Mark IV	optical	Y	3.0 / 920	fixed	n	1/8000s	10.0/s	n	n
5.		Canon 1Ds	optical	Y	2.0 / 120	fixed	n	1/8000s	3.0/s	n	n
6.		Canon 1Ds Mark III	optical	Y	3.0 / 230	fixed	n	1/8000s	5.0/s	n	n
7.		Canon 5D Mark II	optical	Y	3.0 / 920	fixed	n	1/8000s	3.9/s	n	n
8.		Canon 5D Mark III	optical	Y	3.2 / 1040	fixed	n	1/8000s	6.0/s	n	n
9.		Canon 5DS R	optical	Y	3.2 / 1040	fixed	n	1/8000s	5.0/s	n	n
10.		Canon G7 X	none	n	3.0 / 1040	tilting	Y	1/2000s	6.5/s	Y	Y
11.		Canon M	none	n	3.0 / 1040	fixed	Y	1/4000s	4.3/s	n	n
12.		Canon M5	2360	n	3.2 / 1620	tilting	Y	1/4000s	9.0/s	Y	n
13.		Canon M6	optional	n	3.0 / 1040	tilting	Y	1/4000s	9.0/s	Y	n
14.		Canon M10	none	n	3.0 / 1040	tilting	Y	1/4000s	4.6/s	Y	n
15.		Nikon D2Xs	optical	Y	2.5 / 230	fixed	n	1/8000s	5.0/s	n	n
16.		Nikon D3	optical	Y	3.0 / 922	fixed	n	1/8000s	11.0/s	n	n
17.		Nikon D3S	optical	Y	3.0 / 921	fixed	n	1/8000s	11.0/s	n	n
Note: *) Information refers to the mechanical shutter, unless the camera only has an electronic one.

One feature that is present on the 1D Mark III, but is missing on the M3 is a top-level LCD. While being, of course, smaller than the rear screen, the control panel conveys some of the essential shooting information and can be convenient for quick and easy settings verification.

The 1D Mark III writes its imaging data to Compact Flash or SDHC cards, while the M3 uses SDXC cards. The 1D Mark III features dual card slots, which can be very useful in case a memory card fails. In contrast, the M3 only has one slot. The M3 supports UHS-I cards (Ultra High Speed data transfer of up to 104 MB/s), while the 1D Mark III 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-1D Mark III and Canon EOS M3 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 1D Mark III	Y	- / -	-	-	-	2.0	-	-	-
2.		Canon M3	Y	stereo / mono	Y	-	mini	2.0	Y	Y	-
3.		Canon 1D Mark II	Y	- / -	-	-	-	1.1	-	-	-
4.		Canon 1D Mark IV	Y	stereo / -	Y	-	mini	2.0	-	-	-
5.		Canon 1Ds	Y	- / -	-	-	-	FW	-	-	-
6.		Canon 1Ds Mark III	Y	mono / -	-	-	-	2.0	-	-	-
7.		Canon 5D Mark II	Y	mono / mono	Y	-	mini	2.0	-	-	-
8.		Canon 5D Mark III	Y	mono / mono	Y	Y	mini	2.0	-	-	-
9.		Canon 5DS R	Y	mono / mono	Y	-	mini	3.0	-	-	-
10.		Canon G7 X	-	stereo / mono	-	-	micro	2.0	Y	Y	-
11.		Canon M	Y	stereo / mono	Y	-	mini	2.0	-	-	-
12.		Canon M5	Y	stereo / mono	Y	-	mini	2.0	Y	Y	Y
13.		Canon M6	Y	stereo / mono	Y	-	mini	2.0	Y	Y	Y
14.		Canon M10	-	stereo / mono	-	-	mini	2.0	Y	Y	-
15.		Nikon D2Xs	Y	- / -	-	-	-	2.0	-	-	-
16.		Nikon D3	Y	- / -	-	-	mini	2.0	-	-	-
17.		Nikon D3S	Y	stereo / -	-	-	mini	2.0	-	-	-

It is notable that the M3 offers wifi support, which can be a very convenient means to transfer image data to an off-camera location. In contrast, the 1D Mark III does not provide wifi capability.

Studio photographers will appreciate that the Canon 1D Mark III (unlike the M3) features a PC Sync socket, so that professional strobe lights can be controlled by the camera.

Both the 1D Mark III and the M3 have been discontinued, but can regularly be found used on ebay. The 1D Mark III was replaced by the Canon 1D Mark IV, while the M3 was followed by the Canon M6. Further information on the features and operation of the 1D Mark III and M3 can be found, respectively, in the Canon 1D Mark III Manual (free pdf) or the online Canon M3 Manual.

Review summary

So what is the bottom line? Which of the two cameras – the Canon 1D Mark III or the Canon M3 – has the upper hand? Is one clearly better than the other? A synthesis of the relative strong points of each of the models is listed below.

Advantages of the Canon EOS-1D Mark III:

• Easier framing: Has an optical viewfinder for image composition and settings control.
• Easier setting verification: Features an LCD display on top to control shooting parameters.
• Faster shutter: Has higher mechanical shutter speed (1/8000s vs 1/4000s) to freeze action.
• Faster burst: Shoots at higher frequency (10 vs 4.2 flaps/sec) to capture the decisive moment.
• More portrait friendly: Features an integrated vertical grip for easier portrait shooting.
• Longer lasting: Can take more shots (2200 versus 250) on a single battery charge.
• Better sealing: Is weather sealed to enable shooting in dusty or wet environments.
• Better studio light control: Has a PC Sync socket to connect to professional strobe lights.
• Greater peace of mind: Features a second card slot as a backup in case of memory card failure.
• More heavily discounted: Has been available for much longer (launched in February 2007).

Arguments in favor of the Canon EOS M3:

• More detail: Has more megapixels (24 vs 10.1MP), which boosts linear resolution by 54%.
• Better jpgs: Has a more modern image processing engine (DIGIC 6 vs DIGIC III).
• Broader imaging potential: Can capture not only stills but also 1080/30p video.
• Better live-view autofocus: Features on-sensor phase-detection for more confident autofocus.
• More detailed LCD: Has a higher resolution rear screen (1040k vs 230k dots).
• More flexible LCD: Has a tilting screen for odd-angle shots in landscape orientation.
• Fewer buttons to press: Has a touchscreen to facilitate handling and shooting adjustments.
• More selfie-friendly: Has an articulated screen that can be turned to be front-facing.
• More compact: Is smaller (111x68mm vs 156x157mm) and will fit more readily into a bag.
• Less heavy: Has a lower weight (by 789g or 68 percent) and is thus easier to take along.
• More legacy lens friendly: Can use many non-native lenses via adapters.
• Easier fill-in: Has a small integrated flash to brighten shadows of backlit subjects.
• 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.
• Faster buffer clearing: Has an SD card interface that supports the UHS-I standard.
• More affordable: Was introduced into a lower priced category (85 percent cheaper at launch).
• More modern: Reflects 7 years and 11 months of technical progress since the 1D Mark III launch.

If the count of relative strengths (bullet points above) is taken as a measure, the M3 is the clear winner of the contest (17 : 10 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 sports photographer will view the differences between cameras in a way that diverges from the perspective of a street photog, and a person interested in family portraits has distinct needs from a landscape 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 1D Mark III and the Canon M3 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 remains incomplete and does no justice, for example, to the way the 1D Mark III or the M3 perform in practice. User reviews, such as those found at amazon, can sometimes inform about these issues, but such feedback is often incomplete, inconsistent, and biased.

Expert reviews

This is why expert reviews are important. 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	Street Price
1.		Canon 1D Mark III	..	..	..	..	..	..	Feb 2007	EUR 4 309	ebay.com
2.		Canon M3	4/5	o	..	75/100	4.5/5	4/5	Feb 2015	EUR 749	ebay.com
3.		Canon 1D Mark II	..	..	..	+ +	..	..	Jan 2004	EUR 4 499	ebay.com
4.		Canon 1D Mark IV	5/5	..	..	89/100	..	..	Oct 2009	EUR 4 699	ebay.com
5.		Canon 1Ds	..	..	..	+ +	..	..	Sep 2002	EUR 8 999	ebay.com
6.		Canon 1Ds Mark III	..	..	..	+ +	4.5/5	..	Aug 2007	EUR 7 999	ebay.com
7.		Canon 5D Mark II	4/5	91/100	..	79/100	4/5	..	Sep 2008	EUR 3 299	ebay.com
8.		Canon 5D Mark III	..	+ +	..	82/100	4.5/5	4.5/5	Mar 2012	EUR 3 299	ebay.com
9.		Canon 5DS R	5/5	+	..	83/100	5/5	4.5/5	Feb 2015	EUR 3 699	ebay.com
10.		Canon G7 X	4/5	+ +	..	77/100	4.5/5	4.5/5	Sep 2014	EUR 649	ebay.com
11.		Canon M	3/5	+	..	..	4/5	4/5	Jul 2012	EUR 599	ebay.com
12.		Canon M5	4/5	+	4/5	82/100	4/5	4/5	Sep 2016	EUR 1 129	ebay.com
13.		Canon M6	..	..	..	80/100	4/5	4/5	Feb 2017	EUR 799	ebay.com
14.		Canon M10	..	..	..	..	..	4/5	Oct 2015	EUR 499	ebay.com
15.		Nikon D2Xs	..	..	..	..	..	..	Jun 2006	EUR 5 069	ebay.com
16.		Nikon D3	..	..	..	+ +	5/5	4.5/5	Aug 2007	EUR 4 849	ebay.com
17.		Nikon D3S	5/5	..	..	89/100	4.5/5	5/5	Oct 2009	EUR 4 999	ebay.com
Note: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available.

Care should be taken when interpreting the review scores above, though. The ratings are only valid when referring 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 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? If you would like to see a different side-by-side camera review, just make a corresponding selection in the search boxes 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.

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