Canon R6 Mark II vs OM System OM-3

The Canon EOS R6 Mark II and the OM System OM-3 are two enthusiast cameras that were announced, respectively, in November 2022 and February 2025. Both the R6 Mark II and the OM-3 are mirrorless interchangeable lens cameras that are based on a full frame (R6 Mark II) and a Four Thirds (OM-3) sensor. The Canon has a resolution of 24 megapixels, whereas the OM System provides 20.2 MP.

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

Headline Specifications

Canon R6 Mark II		OM System OM-3
Mirrorless system camera		Mirrorless system camera
Canon RF mount lenses		Micro Four Thirds lenses
24 MP – Full Frame sensor		20.2 MP – Four Thirds sensor
4k/60p Video		4K/60p Video
ISO 100-102,400 (100 - 204,800)		ISO 80-25,600 (80 - 102,400)
Electronic viewfinder (3690k dots)		Electronic viewfinder (2360k dots)
3.0" LCD – 1620k dots		3.0" LCD – 1640k dots
Swivel touchscreen		Swivel touchscreen
12 shutter flaps per second		6 shutter flaps per second
In-body stabilization		In-body stabilization
Weathersealed body		Weathersealed body
450 shots per battery charge		590 shots per battery charge
138 x 98 x 88 mm, 670 g		139 x 89 x 46 mm, 496 g

Check R6 Mark II price at
amazon.com
Check OM-3 price at
amazon.com

Going beyond this snapshot of core features and characteristics, what are the differences between the Canon EOS R6 Mark II and the OM System OM-3? 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 R6 Mark II and the OM System OM-3 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 width, height and depth measures are rounded to the nearest millimeter.

The OM-3 can be obtained in two different colors (black, silver), while the R6 Mark II 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 OM System OM-3 is notably smaller (9 percent) than the Canon R6 Mark II. Moreover, the OM-3 is markedly lighter (26 percent) than the R6 Mark II. In this context, it is worth noting that both cameras are splash and dust-proof and can, hence, be used in inclement weather conditions or harsh environments.

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 R6 Mark II gets 450 shots out of its Canon LP-E6NH battery, while the OM-3 can take 590 images on a single charge of its OM System BLX-1 power pack. The battery packs of both cameras can be charged via USB, which can be very convenient when travelling.

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	Street Price
1.		Canon R6 Mark II	138 mm	98 mm	88 mm	670 g	450	Y	Nov 2022	EUR 2 899	amazon.com
2.		OM System OM-3	139 mm	89 mm	46 mm	496 g	590	Y	Feb 2025	EUR 1 999	amazon.com
3.		Canon R3	150 mm	143 mm	87 mm	1015 g	760	Y	Sep 2021	EUR 5 999	amazon.com
4.		Canon R5	138 mm	98 mm	88 mm	738 g	320	Y	Jul 2020	EUR 4 499	amazon.com
5.		Canon R5 C	142 mm	101 mm	111 mm	770 g	320	Y	Jan 2022	EUR 4 999	amazon.com
6.		Canon R6	138 mm	98 mm	88 mm	680 g	360	Y	Jul 2020	EUR 2 699	amazon.com
7.		Canon R7	132 mm	90 mm	92 mm	612 g	660	Y	May 2022	EUR 1 499	amazon.com
8.		Fujifilm X-H2S	136 mm	93 mm	85 mm	660 g	580	Y	May 2022	EUR 2 749	amazon.com
9.		Olympus E-M1 II	134 mm	91 mm	67 mm	574 g	440	Y	Sep 2016	EUR 1 999	ebay.com
10.		Olympus E-M1 III	134 mm	91 mm	69 mm	580 g	420	Y	Feb 2020	EUR 1 799	ebay.com
11.		OM System OM-1	135 mm	92 mm	73 mm	599 g	520	Y	Feb 2022	EUR 2 199	ebay.com
12.		OM System OM-1 II	135 mm	92 mm	73 mm	599 g	500	Y	Jan 2024	EUR 2 399	amazon.com
13.		OM System OM-5 II	125 mm	85 mm	50 mm	414 g	310	Y	Jun 2025	EUR 1 299	amazon.com
14.		Panasonic GH5 II	139 mm	98 mm	87 mm	727 g	400	Y	May 2021	EUR 1 699	amazon.com
15.		Panasonic GH6	138 mm	100 mm	100 mm	823 g	360	Y	Feb 2022	EUR 2 199	amazon.com
16.		Sony A7 IV	131 mm	96 mm	80 mm	659 g	580	Y	Oct 2021	EUR 2 799	amazon.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. The OM-3 was launched at a somewhat lower price (by 20 percent) than the R6 Mark II, 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

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. 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 are more costly to manufacture and tend to lead to bigger and heavier cameras and lenses.

Of the two cameras under consideration, the Canon R6 Mark II features a full frame sensor and the OM System OM-3 a Four Thirds sensor. The sensor area in the OM-3 is 74 percent smaller. As a result of these sensor size differences, the cameras have a format factor of, respectively, 1.0 and 2.0. The sensor in the R6 Mark II has a native 3:2 aspect ratio, while the one in the OM-3 offers a 4:3 aspect.

With 24MP, the R6 Mark II offers a higher resolution than the OM-3 (20.2MP), but the R6 Mark II nevertheless has larger individual pixels (pixel pitch of 5.98μm versus 3.34μm for the OM-3) due to its larger sensor. However, the OM-3 is a much more recent model (by 2 years and 3 months) than the R6 Mark II, and its sensor will have benefitted from technological advances during this time that further enhance the light gathering capacity of its pixels. Coming back to sensor resolution, it should be mentioned that the OM-3 has no anti-alias filter installed, so that it can capture all the detail its sensor resolves.

The resolution advantage of the Canon R6 Mark II implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the R6 Mark II 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 OM System OM-3 are 25.9 x 19.4 inches or 65.8 x 49.4 cm for good quality, 20.7 x 15.6 inches or 52.7 x 39.5 cm for very good quality, and 17.3 x 13 inches or 43.9 x 32.9 cm for excellent quality prints.

Unlike the R6 Mark II, the OM-3 has the capacity to capture high quality composite images (80MP) by combining multiple shots after shifting its sensor by miniscule distances. This multi-shot, pixel-shift mode is most suitable for photography of stationary objects (landscapes, studio scenes).

The Canon EOS R6 Mark II has a native sensitivity range from ISO 100 to ISO 102400, which can be extended to ISO 100-204800. The corresponding ISO settings for the OM System OM-3 are ISO 80 to ISO 25600, with the possibility to increase the ISO range to 80-102400.

In terms of underlying technology, the R6 Mark II is build around a CMOS sensor, while the OM-3 uses a Stacked 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.

For many cameras, data on sensor performance has been reported by DXO Mark. 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"). 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 R6 Mark II	Full Frame	24.0	6000	4000	4k/60p	25.4	14.6	3154	96
2.		OM System OM-3	Four Thirds	20.2	5184	3888	4K/60p	23.4	13.7	1852	78
3.		Canon R3	Full Frame	24.0	6000	4000	6K/60p	25.0	14.7	4086	96
4.		Canon R5	Full Frame	44.8	8192	5464	8K/30p	25.3	14.6	3042	95
5.		Canon R5 C	Full Frame	44.8	8192	5464	8k/60p	25.4	14.5	3082	96
6.		Canon R6	Full Frame	20.0	5472	3648	4k/60p	24.2	14.3	3394	90
7.		Canon R7	APS-C	32.3	6960	4640	4k/60p	24.1	13.8	2092	84
8.		Fujifilm X-H2S	APS-C	26.0	6240	4160	6.2k/30p	24.3	13.9	2224	86
9.		Olympus E-M1 II	Four Thirds	20.2	5184	3888	4K/30p	23.7	12.8	1312	80
10.		Olympus E-M1 III	Four Thirds	20.2	5184	3888	4K/30p	23.3	13.1	1356	76
11.		OM System OM-1	Four Thirds	20.2	5184	3888	4K/60p	23.4	13.4	1553	77
12.		OM System OM-1 II	Four Thirds	20.2	5184	3888	4K/60p	23.4	13.6	1749	78
13.		OM System OM-5 II	Four Thirds	20.2	5184	3888	4K/30p	23.4	13.7	1889	78
14.		Panasonic GH5 II	Four Thirds	20.2	5184	3888	4K/60p	23.7	13.1	1136	79
15.		Panasonic GH6	Four Thirds	25.0	5776	4336	5.7K/60p	23.4	13.4	1555	77
16.		Sony A7 IV	Full Frame	32.7	7008	4672	4K/60p	25.4	14.7	3379	97
Note: DXO values in italics represent estimates based on sensor size and age.

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, and both provide the same movie specifications (4k/60p).

Feature comparison

Beyond body and sensor, cameras can and do differ across a range of features. The two cameras under consideration are similar with respect to both having an electronic viewfinder. However, the one in the R6 Mark II offers a substantially higher resolution than the one in the OM-3 (3690k vs 2360k dots). The table below summarizes some of the other core capabilities of the Canon R6 Mark II and OM System OM-3 in connection with corresponding information for a sample of similar cameras.

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 R6 Mark II	3690	n	3.0 / 1620	swivel	Y	1/8000s	12.0/s	n	Y
2.		OM System OM-3	2360	n	3.0 / 1640	swivel	Y	1/8000s	6.0/s	n	Y
3.		Canon R3	5760	Y	3.2 / 4150	swivel	Y	1/8000s	12.0/s	n	Y
4.		Canon R5	5760	Y	3.2 / 2100	swivel	Y	1/8000s	12.0/s	n	Y
5.		Canon R5 C	5760	Y	3.2 / 2100	swivel	Y	1/8000s	12.0/s	n	n
6.		Canon R6	3690	n	3.0 / 1620	swivel	Y	1/8000s	12.0/s	n	Y
7.		Canon R7	2360	n	3.0 / 1620	swivel	Y	1/8000s	15.0/s	n	Y
8.		Fujifilm X-H2S	5760	Y	3.0 / 1620	swivel	Y	1/8000s	15.0/s	n	Y
9.		Olympus E-M1 II	2360	n	3.0 / 1037	swivel	Y	1/8000s	18.0/s	n	Y
10.		Olympus E-M1 III	2360	n	3.0 / 1037	swivel	Y	1/8000s	18.0/s	n	Y
11.		OM System OM-1	5760	n	3.0 / 1640	swivel	Y	1/8000s	10.0/s	n	Y
12.		OM System OM-1 II	5760	n	3.0 / 1640	swivel	Y	1/8000s	10.0/s	n	Y
13.		OM System OM-5 II	2360	n	3.0 / 1040	swivel	Y	1/8000s	10.0/s	n	Y
14.		Panasonic GH5 II	3680	n	3.0 / 1840	swivel	Y	1/8000s	12.0/s	n	Y
15.		Panasonic GH6	3680	n	3.0 / 1840	full-flex	Y	1/8000s	14.0/s	n	Y
16.		Sony A7 IV	3686	n	3.0 / 1037	swivel	Y	1/8000s	10.0/s	n	Y
Note: *) Information refers to the mechanical shutter, unless the camera only has an electronic one.

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, both cameras under consideration feature an 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 Canon R6 Mark II and the OM System OM-3 both have 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 R6 Mark II and the OM-3 write their files to SDXC cards. The R6 Mark II features dual card slots, which can be very useful in case a memory card fails. In contrast, the OM-3 only has one slot. Both cameras support UHS-II cards, which provide for Ultra High Speed data transfer of up to 312 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 R6 Mark II and OM System OM-3 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 R6 Mark II	Y	stereo / mono	Y	Y	micro	3.2	Y	-	Y
2.		OM System OM-3	Y	stereo / mono	Y	Y	micro	3.0	Y	-	Y
3.		Canon R3	Y	stereo / mono	Y	Y	micro	3.2	Y	-	Y
4.		Canon R5	Y	mono / mono	Y	Y	micro	3.2	Y	-	Y
5.		Canon R5 C	Y	stereo / mono	Y	Y	micro	3.2	Y	-	Y
6.		Canon R6	Y	mono / mono	Y	Y	micro	3.2	Y	-	Y
7.		Canon R7	Y	stereo / mono	Y	Y	micro	3.2	Y	-	Y
8.		Fujifilm X-H2S	Y	stereo / mono	Y	Y	full	3.0	Y	-	Y
9.		Olympus E-M1 II	Y	stereo / mono	Y	Y	micro	3.0	Y	-	-
10.		Olympus E-M1 III	Y	stereo / mono	Y	Y	micro	3.1	Y	-	Y
11.		OM System OM-1	Y	stereo / mono	Y	Y	micro	3.0	Y	-	Y
12.		OM System OM-1 II	Y	stereo / mono	Y	Y	micro	3.0	Y	-	Y
13.		OM System OM-5 II	Y	stereo / mono	Y	-	micro	2.0	Y	-	Y
14.		Panasonic GH5 II	Y	stereo / mono	Y	Y	full	3.2	Y	-	Y
15.		Panasonic GH6	Y	stereo / mono	Y	Y	full	3.2	Y	-	Y
16.		Sony A7 IV	Y	stereo / mono	Y	Y	full	3.2	Y	-	Y

Both the R6 Mark II and the OM-3 are recent models that are part of the current product line-up. The R6 Mark II replaced the earlier Canon R6, while the OM-3 does not have a direct predecessor. Further information on the two cameras (e.g. user guides, manuals), as well as related accessories, can be found on the official Canon and OM System websites.

Review summary

So what conclusions can be drawn? Is the Canon R6 Mark II better than the OM System OM-3 or vice versa? Below is a summary of the relative strengths of each of the two contestants.

Advantages of the Canon EOS R6 Mark II:

• More detail: Offers more megapixels (24 vs 20.2MP) with a 11% higher linear resolution.
• Better moiré control: Has an anti-alias filter to avoid artificial patterns to appear in images.
• Better image quality: Features bigger pixels on a larger sensor for higher quality imaging.
• Richer colors: The pixel size advantage translates into images with better, more accurate colors.
• More dynamic range: Larger pixels capture a wider spectrum of light and dark details.
• Better low-light sensitivity: Larger pixels means good image quality even under poor lighting.
• More detailed viewfinder: Has higher resolution electronic viewfinder (3690k vs 2360k dots).
• Larger viewfinder image: Features a viewfinder with a higher magnification (0.76x vs 0.69x).
• Faster burst: Shoots at higher frequency (12 vs 6 flaps/sec) to capture the decisive moment.
• 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 November 2022).

Reasons to prefer the OM System OM-3:

• Maximized detail: Lacks an anti-alias filter to exploit the sensor's full resolution potential.
• High quality composites: Can combine several shots after pixel-shifting its sensor.
• Less heavy: Has a lower weight (by 174g or 26 percent) and is thus easier to take along.
• Longer lasting: Gets more shots (590 versus 450) out of a single battery charge.
• More affordable: Was released into a lower priced segment (20 percent cheaper at launch).
• More modern: Reflects 2 years and 3 months of technical progress since the R6 Mark II launch.

If the count of relative strengths (bullet points above) is taken as a measure, the R6 Mark II is the clear winner of the match-up (11 : 6 points). However, the relative importance of the various individual camera aspects will vary according to personal preferences and needs, so that you might like to apply corresponding weights to the particular features before making a decision 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 R6 Mark II and the OM System OM-3 place the cameras among the top in their class? Find out in the latest Best Mirrorless Interchangeable Lens Camera listing whether the two cameras rank among the cream of the crop.

In any case, while the comparison of the spec-sheets of cameras can offer a general idea of their imaging potential, it remains partial and cannot reveal, for example, the shooting experience and imaging performance when actually working with the R6 Mark II or the OM-3. 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 why expert reviews are important. 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 R6 Mark II	5/5	+ +	4.5/5	91/100	4.5/5	5/5	Nov 2022	EUR 2 899	amazon.com
2.		OM System OM-3	..	..	..	86/100	..	..	Feb 2025	EUR 1 999	amazon.com
3.		Canon R3	5/5	o	4.5/5	..	5/5	4.5/5	Sep 2021	EUR 5 999	amazon.com
4.		Canon R5	4.5/5	+	4/5	91/100	4.5/5	4.5/5	Jul 2020	EUR 4 499	amazon.com
5.		Canon R5 C	..	+ +	..	..	..	..	Jan 2022	EUR 4 999	amazon.com
6.		Canon R6	5/5	+ +	4/5	90/100	4.5/5	5/5	Jul 2020	EUR 2 699	amazon.com
7.		Canon R7	4.5/5	+	5/5	87/100	4.5/5	4.5/5	May 2022	EUR 1 499	amazon.com
8.		Fujifilm X-H2S	5/5	+	5/5	90/100	5/5	5/5	May 2022	EUR 2 749	amazon.com
9.		Olympus E-M1 II	5/5	+ +	5/5	85/100	4.5/5	4.5/5	Sep 2016	EUR 1 999	ebay.com
10.		Olympus E-M1 III	5/5	..	5/5	83/100	4.5/5	4/5	Feb 2020	EUR 1 799	ebay.com
11.		OM System OM-1	5/5	..	..	87/100	5/5	4.5/5	Feb 2022	EUR 2 199	ebay.com
12.		OM System OM-1 II	..	..	..	..	..	..	Jan 2024	EUR 2 399	amazon.com
13.		OM System OM-5 II	..	..	..	..	..	..	Jun 2025	EUR 1 299	amazon.com
14.		Panasonic GH5 II	4.5/5	..	4.5/5	85/100	4.5/5	5/5	May 2021	EUR 1 699	amazon.com
15.		Panasonic GH6	5/5	+ +	5/5	87/100	5/5	5/5	Feb 2022	EUR 2 199	amazon.com
16.		Sony A7 IV	5/5	+ +	4.5/5	89/100	4.5/5	4.5/5	Oct 2021	EUR 2 799	amazon.com
Note: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available.

Care should be taken when interpreting the review scores above, though. The assessments were made in relation to similar cameras of the same technological generation. 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. Also, please note that some of the review sites have changed their methodology and reporting over time.

Check R6 Mark II price at
amazon.com
Check OM-3 price at
amazon.com

Other camera comparisons

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Check R6 Mark II price at
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