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Canon EOS R3 vs Sony Alpha 7R III (ILCE-7RM3A)

Every spec side by side, from each maker's published figures.

Better figure, where one is clearly better

CanonEOS R3SonyAlpha 7R III (ILCE-7RM3A)
Overview
ReleasedNovember 2021June 2021
Image and sensor
Camera typeMirrorlessMirrorless
Sensor formatFull frameFull frame
Sensor typeBack-illuminated stacked CMOSBack-illuminated Exmor R CMOS
Sensor dimensions36 × 24 mm35.9 × 24 mm
Effective resolution24.1 MP42.4 MP
Largest image6000 × 40007952 × 5304
RAW recordingYesYes
Standard ISO range100–102400100–32000
Sensor detailApproximately 24.1 million effective and 26.7 million total pixels; full-frame back-illuminated stacked CMOS, approximately 36 × 24 mm in the maker's technical guideApproximately 43.6 million total pixels; 3:2 sensor. Pixel Shift Multi Shooting combines four shifted exposures, requiring a static camera/subject and computer processing.
Image formatsJPEG, HEIF, RAW and C-RAW; CR3 still RAW and CRM movie RAW filesJPEG, RAW and RAW+JPEG; Sony ARW 2.3, including uncompressed RAW.
ISO detailStandard still-photo ISO 100–102400, expandable to ISO 50 or 204800; normal movie ISO 100–25600, or ISO 800–25600 with Canon Log 3Standard still-image ISO 100–32000; expanded ISO 50–102400.
Image processorDIGIC XBIONZ X and front-end LSI.
Lens and shooting
Lens mountCanon RFSony E-mount
StabilisationLens and sensor shiftSensor shift
Maximum continuous burst30 fps10 fps
Lens detailCanon RF lenses; EF/EF-S lenses via EF-EOS R adapter, excluding EF-M; EF-S lenses use approximately 1.6× crop–
AutofocusDual Pixel CMOS AF II with people, dogs, cats, birds and motorsport vehicle recognition; up to 4779 manually selected still-photo positions; −7.5 EV still-photo claim with f/1.2 non-DS lens, centre point, One-Shot AF, ISO 100 and room temperature. Eye-control selection is for stills only, requires calibration and may be affected by eyewear, individual eyes and shooting conditionsFast Hybrid AF with 399 full-frame phase-detection points and 425 contrast points. Human and animal Eye AF for stills; phase-point coverage differs with APS-C lenses and crop modes.
ShutterMechanical and electronic first curtain up to 1/8000 second; electronic up to 1/64000 second in Tv/M with restrictions; Bulb supportedFocal-plane shutter; 30 seconds to 1/8000 second plus Bulb; flash sync 1/250 second. Electronic first curtain and silent shooting supported.
Burst detailNormal full-resolution continuous shooting up to 30 fps electronic with AF/AE tracking or 12 fps mechanical/electronic first curtain, depending on lens, battery and settings. Separate custom high-speed mode in firmware 1.2.0 or later reaches 195 fps for up to 50 frames; maker drive-mode manual fixes shutter speed, aperture and ISO from the first shot, and Amateur Photographer reports fixed AF/AE in this brief burstUp to approximately 10 fps with AF/AE tracking, or approximately 8 fps with live view; Sony claims up to 76 compressed RAW/JPEG or 28 uncompressed RAW frames under its test conditions. Settings and shooting conditions affect actual performance.
Stabilisation detailFive-axis in-body image stabilisation coordinated with compatible lens optical IS; Canon UK claims up to eight stops with specific RF lenses, not every lensFive-axis sensor shift; Sony claims 5.5 stops under CIPA pitch/yaw conditions with Planar T* FE 50mm F1.4 ZA and long-exposure noise reduction off. Correction depends on lens compatibility.
FlashMulti-function accessory shoe; mechanical flash sync 1/200 second, electronic first curtain 1/250 second and electronic shutter 1/180 second–
Video
Highest video resolution6000 × 3164 at 59.94 fps3840 × 2160 at 30 fps
Video detailInternal 6K RAW 6000×3164 up to 59.94/50 fps on CFexpress; oversampled uncropped DCI/UHD 4K up to 59.94/50 fps; 4K high-frame-rate 119.88/100 fps; Canon Log 3 and HDR PQ. RAW, 4K high-frame-rate and 4K60 ALL-I are not recordable to SD cards4K 3840 × 2160 recording up to 30p in NTSC mode or 25p in PAL mode; Super 35mm mode provides full-pixel readout without binning, while full-frame 4K is a separate mode. HLG, S-Log2 and S-Log3 supported.
AudioBuilt-in monaural microphone; 3.5 mm stereo microphone and headphone sockets, plus compatible multi-function-shoe audio accessoriesStereo microphone; 3.5 mm microphone and headphone sockets.
Screen and viewfinder
ViewfinderElectronicElectronic
Screen size3.2″3″
Screen dots4,150,0002,359,296
TouchscreenYesYes
Tilting screenYesYes
Display detailFully articulated 3.2-inch capacitive touchscreen; technical guide specifies approximately 4.15 million dots, while the UK store rounds this to 4.2 million; approximately 100% coverageThis separately marketed ILCE-7RM3A revision has a 2,359,296-dot LCD, compared with 1,440,000 dots on the original ILCE-7RM3. Screen tilts approximately 107° up and 41° down; touch focus and touchpad operation supported.
Viewfinder detail0.5-inch OLED EVF, approximately 5.76 million dots, 100% coverage and 0.76× magnification with 50 mm lens at infinity0.5-inch Quad-VGA OLED electronic viewfinder with 3,686,400 dots, 100% coverage and approximately 0.78× magnification with a 50 mm lens at infinity.
Connections and design
Wi-FiYesYes
BluetoothYesYes
Battery life (maker's claim)620 photographs640 photographs
Body weight822 g572 g
Release detailCanon Camera Museum records marketing in November 2021; no exact first-sale day is inferredSony Japan's discontinued-model archive lists June 2021 for ILCE-7RM3A; no precise sale day is claimed. This is a Japanese release month, not a UK date.
Recording mediaOne CFexpress Type B slot and one SD/SDHC/SDXC UHS-II slot; recording to both is limited by the slower cardTwo media slots; one UHS-II-compatible SD slot and one SD/Memory Stick slot. Simultaneous and relay recording supported.
PortsUSB-C 3.2 Gen 2, micro HDMI Type D, RJ45 Ethernet, 3.5 mm microphone/headphone sockets and N3 remote-control terminalUSB Type-C with SuperSpeed USB 5 Gbps, Multi/Micro USB, Micro HDMI, microphone and headphone sockets, sync terminal and Multi Interface Shoe.
Wireless connectionsWi-Fi 802.11a/b/g/n/ac at 2.4/5 GHz with regional frequency restrictions; Bluetooth Low Energy 5.0; built-in GPS, GLONASS and MICHIBIKI positioningWi-Fi IEEE 802.11b/g/n at 2.4 GHz, NFC and Bluetooth 4.1.
Battery life detailLP-E19; CIPA power-saving approximately 620 EVF or 860 screen shots at 23°C using an SD card; smooth-display approximately 440/760 shots under the same maker conditionsNP-FZ100; CIPA approximately 640 photographs using the LCD or 530 using the viewfinder. In-camera charging and power via USB Type-C or Multi/Micro USB.
ChargingIn-camera charging with optional USB Power Adapter PD-E1; this adapter does not power the camera while operating; AC-E19 and DR-E19 provide optional AC power–
DimensionsApproximately 150 × 142.6 × 87.2 mm (width × height × depth)Approximately 126.9 × 95.6 × 73.7 mm (width × height × maximum depth); grip-to-monitor depth 62.7 mm.
Weight detailApproximately 822 g body only, excluding body cap, eyecup and multi-function-shoe cover; approximately 1015 g including battery and CFexpress card; photographed kit lens excludedApproximately 572 g body only according to Sony Japan; 657 g with battery and memory card; lens excluded.
MaterialsMagnesium-alloy body with dust- and moisture-resistant construction; resistance is not an underwater ratingMagnesium-alloy covers and internal frame; dust- and moisture-resistant design, not a waterproof rating.
In the boxUK body package includes LP-E19 battery, LC-E19 charger and AC cable, R-F-5 body cap, ER-h small eyecup, IFC-100U interface cable/protector, ER-L1 strap and accessory-shoe coverPower cord, NP-FZ100 battery, cable protector, BC-QZ1 charger, shoulder strap, body cap, accessory shoe cap, eyepiece cup and USB Type-C cable, according to Sony UK.

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