Canon R1 vs Sony A7S III

The Canon EOS R1 and the Sony Alpha 7S III are two professional cameras that were officially introduced, respectively, in July 2024 and July 2020. Both the R1 and the A7S III are mirrorless interchangeable lens cameras that are equipped with a full frame sensor. The Canon has a resolution of 24 megapixels, whereas the Sony provides 12 MP.

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

Headline Specifications

Canon R1		Sony A7S III
Mirrorless system camera		Mirrorless system camera
Canon RF mount lenses		Sony E mount lenses
24 MP – Full Frame sensor		12 MP – Full Frame sensor
6K/60p Video		4K/120p Video
ISO 100-102,400 (50 - 409,600)		ISO 80-102,400 (40 - 409,600)
Electronic viewfinder (9440k dots)		Electronic viewfinder (9440k dots)
3.2" LCD – 2100k dots		3.0" LCD – 1440k dots
Swivel touchscreen		Swivel touchscreen
12 shutter flaps per second		10 shutter flaps per second
In-body stabilization		In-body stabilization
Weathersealed body		Weathersealed body
1330 shots per battery charge		600 shots per battery charge
158 x 150 x 87 mm, 1115 g		127 x 97 x 81 mm, 699 g

Check R1 price at
amazon.com
Check A7S III price at
amazon.com

Going beyond this snapshot of core features and characteristics, what are the differences between the Canon EOS R1 and the Sony Alpha 7S III? 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 physical size and weight of the Canon R1 and the Sony A7S III are illustrated in the side-by-side display below. 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 measures are rounded to the nearest millimeter.

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Sony A7S III is considerably smaller (48 percent) than the Canon R1. Moreover, the A7S III is substantially lighter (37 percent) than the R1. 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 R1 gets 1330 shots out of its Canon LP-E19 battery, while the A7S III can take 600 images on a single charge of its Sony NP-FZ100 power pack. As can be seen in the images above, the R1 has a battery grip built in. This facilitates image-taking in portrait orientation and gives it additional battery power. In order to provide similar functionality for the A7S III, Sony provides the VG-C3EM vertical grip as an optional accessory (see here on ebay). The battery packs of both cameras can be charged via USB, which can be very convenient when travelling.

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, 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 R1	158 mm	150 mm	87 mm	1115 g	1330	Y	Jul 2024	US$ 6 299	amazon.com
2.		Sony A7S III	127 mm	97 mm	81 mm	699 g	600	Y	Jul 2020	US$ 3 499	amazon.com
3.		Canon R3	150 mm	143 mm	87 mm	1015 g	760	Y	Sep 2021	US$ 5 999	amazon.com
4.		Canon R5 Mark II	138 mm	98 mm	88 mm	746 g	340	Y	Jul 2024	US$ 4 299	amazon.com
5.		Canon R6	138 mm	98 mm	88 mm	680 g	360	Y	Jul 2020	US$ 2 499	amazon.com
6.		Canon R6 Mark II	138 mm	98 mm	88 mm	670 g	450	Y	Nov 2022	US$ 2 499	amazon.com
7.		Fujifilm GFX 100 II	152 mm	117 mm	99 mm	1030 g	540	Y	Sep 2023	US$ 7 499	amazon.com
8.		Leica SL3-S	141 mm	108 mm	85 mm	852 g	315	Y	Jan 2025	US$ 5 299	amazon.com
9.		Nikon Zf	144 mm	103 mm	49 mm	710 g	380	Y	Sep 2023	US$ 1 999	amazon.com
10.		Panasonic G9 II	134 mm	102 mm	90 mm	658 g	390	Y	Sep 2023	US$ 1 899	amazon.com
11.		Sony A7R III	127 mm	96 mm	74 mm	650 g	650	Y	Oct 2017	US$ 3 199	ebay.com
12.		Sony A7R IV	129 mm	96 mm	78 mm	665 g	670	Y	Jul 2019	US$ 3 499	ebay.com
13.		Sony A7R IVA	129 mm	96 mm	78 mm	665 g	670	Y	Apr 2021	US$ 3 499	amazon.com
14.		Sony A7S II	127 mm	96 mm	60 mm	627 g	370	Y	Sep 2015	US$ 2 999	ebay.com
15.		Sony A9 II	129 mm	96 mm	76 mm	678 g	690	Y	Oct 2019	US$ 4 499	amazon.com
16.		Sony A9 III	136 mm	97 mm	83 mm	702 g	530	Y	Nov 2023	US$ 5 999	amazon.com
17.		Sony A6700	122 mm	69 mm	64 mm	493 g	570	Y	Jul 2023	US$ 1 399	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

Any camera decision will obviously take relative prices into account. 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 A7S III was launched at a markedly lower price (by 44 percent) than the R1, 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 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 generally have larger individual pixels that offer better low-light sensitivity, provide wider dynamic range, and have 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 are more costly to manufacture and tend to lead to bigger and heavier cameras and lenses.

Both cameras under consideration feature a full frame sensor, but their sensors differ slightly in size. The sensor area in the A7S III is 2 percent smaller. They nevertheless have the same format factor of 1.0. Both cameras have a native aspect ratio (sensor width to sensor height) of 3:2.

With 24MP, the R1 offers a higher resolution than the A7S III (12MP), but the R1 has smaller individual pixels (pixel pitch of 6.00μm versus 8.40μm for the A7S III). However, the R1 is a much more recent model (by 3 years and 11 months) than the A7S III, and its sensor will have benefitted from technological advances during this time that enhance the light gathering capacity of its pixels.

The resolution advantage of the Canon R1 implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the R1 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 Sony A7S III are 21.2 x 14.2 inches or 53.8 x 36 cm for good quality, 17 x 11.3 inches or 43.1 x 28.8 cm for very good quality, and 14.1 x 9.4 inches or 35.9 x 24 cm for excellent quality prints.

The Canon EOS R1 has a native sensitivity range from ISO 100 to ISO 102400, which can be extended to ISO 50-409600. The corresponding ISO settings for the Sony Alpha 7S III are ISO 80 to ISO 102400, with the possibility to increase the ISO range to 40-409600.

In terms of underlying technology, the R1 is build around a Stacked BSI-CMOS sensor, while the A7S III 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.

Since 2007, DXO Mark has published sensor performance measurements that have been derived using a consistent methodology. 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 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 R1	Full Frame	24.0	6000	4000	6K/60p	25.4	14.8	3332	97
2.		Sony A7S III	Full Frame	12.0	4240	2832	4K/120p	23.7	13.9	2520	86
3.		Canon R3	Full Frame	24.0	6000	4000	6K/60p	25.0	14.7	4086	96
4.		Canon R5 Mark II	Full Frame	44.8	8192	5464	8k/60p	25.4	14.8	3332	97
5.		Canon R6	Full Frame	20.0	5472	3648	4k/60p	24.2	14.3	3394	90
6.		Canon R6 Mark II	Full Frame	24.0	6000	4000	4k/60p	25.4	14.6	3154	96
7.		Fujifilm GFX 100 II	Medium Format	101.8	11648	8736	8K/30p	25.9	15.0	3651	101
8.		Leica SL3-S	Full Frame	24.0	6000	4000	6K/30p	25.4	14.8	3383	97
9.		Nikon Zf	Full Frame	24.3	6048	4024	4K/60p	25.4	14.7	3243	96
10.		Panasonic G9 II	Four Thirds	25.0	5776	4336	5.7K/60p	23.4	13.5	1710	78
11.		Sony A7R III	Full Frame	42.2	7952	5304	4K/30p	26.0	14.7	3523	100
12.		Sony A7R IV	Full Frame	60.2	9504	6336	4K/30p	26.0	14.8	3344	99
13.		Sony A7R IVA	Full Frame	60.2	9504	6336	4K/30p	26.0	14.8	3344	99
14.		Sony A7S II	Full Frame	12.0	4240	2832	4K/30p	23.6	13.3	2993	85
15.		Sony A9 II	Full Frame	24.0	6000	4000	4K/30p	25.0	14.0	3434	93
16.		Sony A9 III	Full Frame	24.0	6000	4000	4K/120p	25.4	14.7	3243	96
17.		Sony A6700	APS-C	25.6	6192	4128	4K/120p	24.3	14.0	2329	86
Note: DXO values in italics represent estimates based on sensor size and age.

Many modern cameras are not only capable of taking still images, but can also record movies. The two cameras under consideration both have sensors whose read-out speed is fast enough to capture moving pictures, but the R1 provides a higher video resolution than the A7S III. It can shoot video footage at 6K/60p, while the Sony is limited to 4K/120p.

Feature comparison

Apart from body and sensor, cameras can and do differ across a variety of features. The R1 and the A7S III are similar in the sense that both feature an electronic viewfinder, which is helpful when framing images in bright sunlight. Moreover, their viewfinders offer an identical resolution of 9440k dots. The table below summarizes some of the other core capabilities of the Canon R1 and Sony A7S III 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 R1	9440	Y	3.2 / 2100	swivel	Y	1/8000s	12.0/s	n	Y
2.		Sony A7S III	9440	n	3.0 / 1440	swivel	Y	1/8000s	10.0/s	n	Y
3.		Canon R3	5760	Y	3.2 / 4150	swivel	Y	1/8000s	12.0/s	n	Y
4.		Canon R5 Mark II	5760	Y	3.2 / 2100	swivel	Y	1/8000s	12.0/s	n	Y
5.		Canon R6	3690	n	3.0 / 1620	swivel	Y	1/8000s	12.0/s	n	Y
6.		Canon R6 Mark II	3690	n	3.0 / 1620	swivel	Y	1/8000s	12.0/s	n	Y
7.		Fujifilm GFX 100 II	9440	Y	3.2 / 2360	full-flex	Y	1/4000s	8.0/s	n	Y
8.		Leica SL3-S	5760	Y	3.2 / 2333	tilting	Y	1/8000s	30.0/s	n	Y
9.		Nikon Zf	3690	n	3.2 / 2100	swivel	Y	1/8000s	14.0/s	n	Y
10.		Panasonic G9 II	3680	n	3.0 / 1840	swivel	Y	1/8000s	10.0/s	n	Y
11.		Sony A7R III	3686	n	3.0 / 1440	tilting	Y	1/8000s	10.0/s	n	Y
12.		Sony A7R IV	5760	n	3.0 / 1440	tilting	Y	1/8000s	10.0/s	n	Y
13.		Sony A7R IVA	5760	n	3.0 / 2340	tilting	Y	1/8000s	10.0/s	n	Y
14.		Sony A7S II	2400	n	3.0 / 1229	tilting	n	1/8000s	5.0/s	n	Y
15.		Sony A9 II	3686	n	3.0 / 1440	tilting	Y	1/8000s	20.0/s	n	Y
16.		Sony A9 III	9440	n	3.2 / 2100	full-flex	Y	1/80000s	120.0/s	n	Y
17.		Sony A6700	2360	n	3.0 / 1037	swivel	Y	1/4000s	11.0/s	n	Y
Note: *) Information refers to the mechanical shutter, unless the camera only has an electronic one.

One feature that is present on the R1, but is missing on the A7S III 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 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 R1 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.

The R1 writes its imaging data to CFexpress (type B) or SDXC cards, while the A7S III uses CFexpress (type A) or SDXC cards. Both cameras feature dual card slots, which can be very useful in case a memory card fails. Moreover, both cameras support UHS-II cards (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 R1 and Sony Alpha 7S III 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 R1	Y	stereo / mono	Y	Y	full	3.2	Y	-	Y
2.		Sony A7S III	Y	stereo / mono	Y	Y	full	3.2	Y	-	Y
3.		Canon R3	Y	stereo / mono	Y	Y	micro	3.2	Y	-	Y
4.		Canon R5 Mark II	Y	mono / mono	Y	Y	full	3.2	Y	-	Y
5.		Canon R6	Y	mono / mono	Y	Y	micro	3.2	Y	-	Y
6.		Canon R6 Mark II	Y	stereo / mono	Y	Y	micro	3.2	Y	-	Y
7.		Fujifilm GFX 100 II	Y	stereo / mono	Y	Y	full	3.2	Y	-	Y
8.		Leica SL3-S	Y	stereo / mono	Y	Y	full	3.2	Y	-	Y
9.		Nikon Zf	Y	stereo / mono	Y	Y	micro	3.2	Y	-	Y
10.		Panasonic G9 II	Y	stereo / mono	Y	Y	full	3.2	Y	-	Y
11.		Sony A7R III	Y	stereo / mono	Y	Y	micro	3.1	Y	Y	Y
12.		Sony A7R IV	Y	stereo / mono	Y	Y	micro	3.1	Y	Y	Y
13.		Sony A7R IVA	Y	stereo / mono	Y	Y	micro	3.2	Y	Y	Y
14.		Sony A7S II	Y	stereo / mono	Y	Y	micro	2.0	Y	Y	-
15.		Sony A9 II	Y	stereo / mono	Y	Y	micro	3.1	Y	Y	Y
16.		Sony A9 III	Y	stereo / mono	Y	Y	full	3.2	Y	-	Y
17.		Sony A6700	Y	stereo / mono	Y	Y	YES	3.2	Y	Y	Y

Studio photographers will appreciate that the Canon R1 (unlike the A7S III) features a PC Sync socket, so that professional strobe lights can be controlled by the camera.

Both the R1 and the A7S III are recent models that are part of the current product line-up. The A7S III replaced the earlier Sony A7S II, while the R1 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 Sony websites.

Review summary

So how do things add up? Is there a clear favorite between the Canon R1 and the Sony A7S III? Which camera is better? The listing below highlights the relative strengths of the two models.

Advantages of the Canon EOS R1:

• More detail: Offers more megapixels (24 vs 12MP) with a 41% higher linear resolution.
• Better video: Provides higher definition movie capture (6K/60p vs 4K/120p).
• Easier setting verification: Features an LCD display on top to control shooting parameters.
• 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 (2100k vs 1440k dots).
• Faster burst: Shoots at higher frequency (12 vs 10 flaps/sec) to capture the decisive moment.
• Easier time-lapse photography: Has an intervalometer built-in for low frequency shooting.
• More portrait friendly: Features an integrated vertical grip for easier portrait shooting.
• Longer lasting: Can take more shots (1330 versus 600) on a single battery charge.
• Better studio light control: Has a PC Sync socket to connect to professional strobe lights.
• More modern: Reflects 3 years and 11 months of technical progress since the A7S III launch.

Reasons to prefer the Sony Alpha 7S III:

• Larger viewfinder image: Features a viewfinder with a higher magnification (0.91x vs 0.9x).
• More compact: Is smaller (127x97mm vs 158x150mm) and will fit more readily into a bag.
• Less heavy: Has a lower weight (by 416g or 37 percent) and is thus easier to take along.
• More affordable: Was introduced into a lower priced category (44 percent cheaper at launch).
• More heavily discounted: Has been around for much longer (launched in July 2020).

If the count of individual advantages (bullet points above) is taken as a guide, the R1 is the clear winner of the match-up (11 : 5 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 R1 and the Sony A7S III 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 incomplete and does no justice, for example, to the way the R1 or the A7S III perform in practice. 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 (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 R1	..	..	..	..	..	..	Jul 2024	US$ 6 299	amazon.com
2.		Sony A7S III	4.5/5	+ +	5/5	91/100	4.5/5	5/5	Jul 2020	US$ 3 499	amazon.com
3.		Canon R3	5/5	o	4.5/5	..	5/5	4.5/5	Sep 2021	US$ 5 999	amazon.com
4.		Canon R5 Mark II	..	..	..	93/100	..	..	Jul 2024	US$ 4 299	amazon.com
5.		Canon R6	5/5	+ +	4/5	90/100	4.5/5	5/5	Jul 2020	US$ 2 499	amazon.com
6.		Canon R6 Mark II	5/5	+ +	4.5/5	91/100	4.5/5	5/5	Nov 2022	US$ 2 499	amazon.com
7.		Fujifilm GFX 100 II	5/5	+	5/5	..	..	4.5/5	Sep 2023	US$ 7 499	amazon.com
8.		Leica SL3-S	..	..	..	..	..	..	Jan 2025	US$ 5 299	amazon.com
9.		Nikon Zf	4.5/5	..	4.5/5	90/100	4.5/5	5/5	Sep 2023	US$ 1 999	amazon.com
10.		Panasonic G9 II	5/5	..	4.5/5	87/100	..	4.5/5	Sep 2023	US$ 1 899	amazon.com
11.		Sony A7R III	..	+ +	4/5	90/100	4.5/5	5/5	Oct 2017	US$ 3 199	ebay.com
12.		Sony A7R IV	5/5	+	4.5/5	91/100	4.5/5	5/5	Jul 2019	US$ 3 499	ebay.com
13.		Sony A7R IVA	5/5	+	4.5/5	91/100	4.5/5	5/5	Apr 2021	US$ 3 499	amazon.com
14.		Sony A7S II	5/5	+	..	..	4.5/5	5/5	Sep 2015	US$ 2 999	ebay.com
15.		Sony A9 II	..	..	5/5	90/100	5/5	5/5	Oct 2019	US$ 4 499	amazon.com
16.		Sony A9 III	4.5/5	..	..	91/100	..	..	Nov 2023	US$ 5 999	amazon.com
17.		Sony A6700	4.5/5	+	4.5/5	88/100	4.5/5	4.5/5	Jul 2023	US$ 1 399	amazon.com
Note: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available.

Care should be taken when interpreting the review scores above, though. The ratings were established in reference to similarly priced cameras that were available in the market at the time of the review. Hence, a score should always be seen in the context of the camera's market launch date and its price, and comparisons of ratings among very different cameras or across long time periods have little meaning. It should also be noted that some of the review sites have over time altered the way they render their verdicts.

Check R1 price at
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Check A7S III price at
amazon.com

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 a corresponding selection in the search boxes below. Alternatively, you can follow any of the listed hyperlinks for comparisons that others found interesting.

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