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Canon EOS-1D X Mark III vs Canon EOS R8

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

Better figure, where one is clearly better

CanonEOS-1D X Mark IIICanonEOS R8
Overview
ReleasedFebruary 2020April 2023
Image and sensor
Camera typeDSLRMirrorless
Sensor formatFull frameFull frame
Sensor typeCMOSCMOS
Sensor dimensions35.9 × 23.9 mm35.9 × 23.9 mm
Effective resolution20.1 MP24.2 MP
Largest image5472 × 36486000 × 4000
RAW recordingYesYes
Standard ISO range100–102400100–102400
Sensor detailApproximately 20.1 million effective pixels on a 35.9 × 23.9 mm full-frame CMOS sensor; automatic/manual cleaning and Dust Delete DataApproximately 24.2 million effective and 25.6 million total pixels; 35.9 × 23.9 mm CMOS with fixed low-pass filter and integrated sensor cleaning
Image formats14-bit RAW/C-RAW, 8-bit JPEG and 10-bit HEIF HDR PQ; electronic shutter uses 12-bit RAW conversion; simultaneous RAW and JPEG or HEIF availableRAW and C-RAW with 14-bit conversion using electronic first curtain or 12-bit using electronic shutter; 8-bit JPEG and 10-bit HEIF, with simultaneous RAW and JPEG or HEIF
ISO detailStandard still-photo ISO 100–102400, expandable to ISO 50, 204800, 409600 or 819200; movie ISO range depends on recording modeStandard still-photo ISO 100–102400, expandable to ISO 50 or 204800; movie sensitivity depends on frame rate and Canon Log or HDR settings
Image processorDIGIC XDIGIC X
Lens and shooting
Lens mountCanon EFCanon RF
Stabilisation–Optical lens stabilisation
Maximum continuous burst20 fps40 fps
Lens detailCanon EF lenses; EF-S and EF-M incompatible; official photo shows an attached EF 24-70mm F2.8L II USM whose figures are separate from the bodyRF and RF-S directly; EF and EF-S via EF-EOS R mount adapters; RF-S and EF-S use 1.6× cropping; EF-M incompatible
AutofocusOptical-viewfinder phase-detection AF with up to 191 points and 155 cross-type points depending on lens, with face/head recognition; live-view Dual Pixel CMOS AF with up to 3869 selectable positions, 525 automatic areas and eye detection; area coverage depends on lensDual Pixel CMOS AF II with 1053 automatic areas and 4897 selectable still-photo positions (4067 for movies); human, animal and vehicle recognition; AF area coverage depends on lens and mode
ShutterMechanical and electronic first curtain 30–1/8000 second plus Bulb; live-view electronic 0.5–1/8000 second; maximum flash sync 1/250 secondElectronic first curtain 30–1/4000 second plus Bulb; electronic 30–1/16000 second, with 1/16000 restricted to Tv or M and unavailable in H+; no mechanical first curtain
Burst detailUp to 16 fps through the optical viewfinder or 20 fps in live view, with AF/AE tracking; live-view mechanical or electronic shutter supported; maker buffer claim at least 1000 JPEG, HEIF, RAW or RAW+JPEG frames in viewfinder shooting using a specified 325 GB test card; approximately 350 RAW+HEIF; lens, lighting, power, temperature and settings affect performanceUp to 40 fps electronic or 6 fps electronic first curtain; UK maker buffer claim 120 JPEG, 56 RAW or 100 C-RAW at 40 fps; 30 fps RAW Burst mode with up to 0.5 second pre-capture is separate; lens, exposure, lighting and subject conditions affect speed, and electronic rolling-shutter distortion is possible
Stabilisation detailMovie Digital IS available; this is electronic movie stabilisation rather than sensor-shift IBISNo sensor-shift IBIS; optical stabilisation depends on the attached lens; Movie Digital IS is available separately
FlashExternal EL/EX Speedlite E-TTL II support; PC sync terminal and flash controlsExternal E-TTL II EX/EL Speedlite support through the multi-function shoe; electronic-first-curtain sync 1/200 second
Exposure controlsP, Tv, Av, M, Bulb and three custom modes; viewfinder 216-zone metering with approximately 400000-pixel RGB+IR sensor; live-view/movie 384-zone image-sensor metering; compensation up to ±5 EV through viewfinder or ±3 EV in live view/moviesScene Intelligent Auto, Fv, P, Tv, Av, M, Bulb and two custom modes; 384-zone evaluative, partial, centre spot and centre-weighted metering; ±3 EV compensation
Video
Highest video resolution5472 × 2886 at 59.94 fps3840 × 2160 at 59.94 fps
Video detailInternal 12-bit RAW 5472 × 2886 up to 59.94/50 fps; DCI 4096 × 2160 and UHD 3840 × 2160 up to 59.94/50 fps; Full HD up to 119.9/100 fps; H.264 8-bit 4:2:0 or H.265 10-bit 4:2:2 with Canon Log; main RAW 59.94p maker bitrate approximately 2600 Mbps; 4K HDMI output supported; DPReview notes autofocus requires cropped 4K or lower frame rates in full-width recordingFull-width UHD 3840 × 2160 up to 59.94/50 fps oversampled from 6K; optional cropped mode uses 62% of the horizontal area; Full HD up to 179.82/150 fps slow motion without sound; internal 8-bit 4:2:0 or 10-bit 4:2:2, Canon Log 3 and HDR PQ; normal clip limit two hours, subject to temperature, with maker approximately 30 minutes 4K 59.94p starting at 23°C
AudioBuilt-in monaural microphone; stereo external microphone/line input and headphone sockets; adjustable levels, wind filter and attenuatorBuilt-in stereo microphone; 3.5 mm external microphone and headphone sockets
Screen and viewfinder
ViewfinderOpticalElectronic
Screen size3.15″3″
Screen dots2,100,0001,620,000
TouchscreenYesYes
Tilting screenNoYes
Display detailFixed capacitive touchscreen; maker manual specifies 8.01 cm (3.15 inches), approximately 2.1 million dots; commonly marketed rounded as 3.2 inchesVari-angle 3-inch Clear View LCD II capacitive touchscreen with approximately 1.62 million dots and 100% coverage
Viewfinder detailOptical eye-level pentaprism with approximately 100% coverage and 0.76× magnification with a 50 mm lens at infinity; built-in eyepiece shutter0.39-inch OLED, approximately 2.36 million dots, 100% coverage and 0.70× magnification; display refresh approximately 60 or 120 fps with mode- and shooting-dependent reductions
Connections and design
Wi-FiYesYes
BluetoothYesYes
Battery life (maker's claim)2850 photographs220 photographs
Body weight1250 g414 g
Release detailCanon Camera Museum records first marketing in February 2020; no exact first-sale day inferredCanon Camera Museum records first marketing in April 2023; no exact first-sale day inferred
Recording mediaTwo CFexpress Type B memory-card slots; still/movie separation and recording/backup optionsSingle SD, SDHC or SDXC slot with UHS-II support; high-speed UHS-II recommended for 4K and fast bursts
PortsUSB-C SuperSpeed Plus USB 3.1 Gen 2, mini HDMI Type C, microphone/line input, headphone socket, N3 remote terminal, RJ45 Ethernet, WFT-E9 extension connector and PC flash syncUSB-C 3.2 Gen 2 for transfer, power and charging; micro HDMI Type D, microphone and headphone sockets, E3 remote terminal and multi-function shoe
Wireless connectionsWi-Fi 802.11b/g/n at 2.4 GHz and Bluetooth Low Energy 4.2; wired Ethernet 10/100/1000BASE-T; GPS, GLONASS and QZSS geotaggingWi-Fi 802.11b/g/n at 2.4 GHz and Bluetooth Low Energy 4.2; regional restrictions may apply
Battery life detailLP-E19; maker approximately 2850 viewfinder or 610 live-view photographs at 23°C with a fully charged battery; approximately 2360/530 respectively at 0°C, based on Canon/CIPA testingLP-E17; maker CIPA power-saving claim at 23°C approximately 220 photographs with EVF or 370 with LCD
Charging–Supplied LC-E17E external charger; USB charging supported with authenticated batteries, using compatible power equipment
DimensionsApproximately 158.0 × 167.6 × 82.6 mm (width × height × depth)Approximately 132.5 × 86.1 × 70.0 mm (width × height × depth)
Weight detailApproximately 1250 g body only or 1440 g including battery and card; attached lens in official image is excludedApproximately 414 g body only or 461 g with battery and card under CIPA guidelines
Materials–Primarily magnesium alloy with aluminium alloy and glass-fibre polycarbonate components; maker describes dust- and water-resistant construction with covers closed, but not waterproof

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