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Sony Alpha 9 III vs Sony Alpha SLT-A77

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

Better figure, where one is clearly better

SonyAlpha 9 IIISonyAlpha SLT-A77
Overview
ReleasedJanuary 2024September 2011
Image and sensor
Camera typeMirrorlessTranslucent mirror
Sensor formatFull frameAPS-C
Sensor typeStacked Exmor RS CMOS with global shutterExmor APS HD CMOS
Sensor dimensions35.6 × 23.8 mm23.5 × 15.6 mm
Effective resolution24.6 MP24.3 MP
Largest image6000 × 40006000 × 4000
RAW recordingYesYes
Standard ISO range250–25600100–16000
Sensor detailApproximately 25.2 million total pixels; integral memory and global exposure rather than sequential line exposure.24.7 million total photosites; fixed translucent mirror feeds a dedicated phase-detection AF sensor while the main sensor supplies live view
Image formatsJPEG, HEIF and Sony ARW 5.0 RAW.JPEG, RAW (Sony ARW 2.3), RAW+JPEG and 3D MPO panoramas; 3:2 or 16:9 stills
ISO detailStandard ISO 250–25600 for stills and movies; stills expand to ISO 125–51200.Auto ISO 100–12800 with adjustable limits; expanded ISO 50; multi-frame noise reduction ISO 100–25600; main ISO range excludes expansion
Image processorBIONZ XR with dedicated AI processing unit.BIONZ
Lens and shooting
Lens mountSony E-mountSony A-mount
StabilisationSensor shiftSensor shift
Maximum continuous burst120 fps12 fps
Lens detail–Compatible Sony, Minolta and Konica Minolta A-mount AF lenses; kit lenses are separate from body specifications
AutofocusUp to 759 still-image or 627 movie phase-detection points; sensitivity EV −5 to 20 with an F2 lens at ISO 100 equivalent. Current UK specification includes automatic subject selection and people, animals, birds, insects, cars, trains and aircraft; launch reviews precede later firmware enhancements.19-point phase-detection AF with 11 cross sensors; EV −1–18 at ISO 100 with an F2.8 lens; AF-S, AF-A, AF-C, direct manual and manual focus; tracking AF and built-in LED assist
Shutter–1/8000–30 seconds and Bulb; flash sync 1/250 second; selectable electronic first curtain; maker-rated approximately 150,000 shutter operations
Burst detailUp to 120 fps full-resolution electronic bursts with AF/AE tracking under Sony test conditions; speed depends on lens compatibility and shooting settings. Pre-Capture retains up to one second before full shutter press. No mechanical shutter.Up to 12 fps at full resolution in Continuous Advance Priority AE with continuous phase-detection AF; ordinary drive 8 fps Hi or 3 fps Lo. Maker buffer claim at 12 fps: 13 Extra Fine JPEG, 17 Fine/Standard JPEG, 13 RAW or 11 RAW+JPEG frames; ordinary drive reaches 18 Fine/Standard JPEG frames. Performance depends on card and shooting conditions.
Stabilisation detailFive-axis sensor shift; 8.0-stop CIPA pitch/yaw claim with FE 50mm F1.2 GM and long-exposure noise reduction off. Active and Dynamic Active movie modes supported.SteadyShot INSIDE sensor shift for stills, maker claim approximately 2.5–4.5 stops; electronic stabilisation for movies
Flash–Automatic pop-up flash, guide number 12 in metres at ISO 100; ADI, pre-flash TTL and manual output; ±3 EV flash compensation; external compatible flash required for wireless and high-speed sync
Exposure controls–PASM, Auto, Auto+, scene, panorama and memory-recall modes; 1200-zone metering; ±5 EV exposure compensation in 1/3 or 1/2 steps; three-frame Auto HDR, D-Range Optimizer and Picture Effects
Video
Highest video resolution3840 × 2160 at 120 fps1920 × 1080 at 60 fps
Video detailUp to uncropped 3840 × 2160 120p NTSC or 100p PAL; 4K 60p uses 6K oversampling. Supports 10-bit 4:2:2, S-Log3 and S-Cinetone; All-Intra 4K tops out at 60p. External HDMI RAW output is separate from internal recording.Japan/NTSC model: 1920 × 1080 AVCHD 2.0 at 60p/28 Mbps, 60i/24 or 17 Mbps, and 24p/24 or 17 Mbps; PAL models use 50p, 50i and 25p. MP4 supports 1440 × 1080 or VGA. P/A/S/M movie exposure modes require manual focus; continuous phase-detection AF is available with automatic movie exposure.
Audio–Built-in stereo microphone with wind-noise reduction, external stereo microphone input and mono playback speaker
Screen and viewfinder
ViewfinderElectronicElectronic
Screen size3.2″3″
Screen dots2,095,104921,600
TouchscreenYesNo
Tilting screenYesYes
Display detailFour-axis LCD tilts and opens sideways; approximately 98° up, 40° down, 180° sideways and 270° rotation.Three-axis articulating LCD: 150° upwards, 180° forwards, then rotation 180° right or 90° left; 921,600 dots count colour subpixels; focus peaking and magnification; separate top status LCD
Viewfinder detail0.64-inch Quad-XGA OLED with 9437184 dots and approximately 0.90× magnification with a 50 mm lens at infinity; selectable up to 240 fps NTSC or 200 fps PAL.0.5-type XGA OLED Tru-Finder with 2,359,296 dots, 100% coverage and approximately 1.09× magnification with a 50 mm lens; focus magnification and electronic level
Connections and design
Wi-FiYes–
BluetoothYes–
Battery life (maker's claim)530 photographs470 photographs
Body weight617 g653 g
Release detailSony UK announced availability in January 2024; Japan's announcement specifies 26 January. The main date retains UK month precision.Sony China announced staggered availability from mid-September 2011; the UK announcement specifies October 2011; Sony Japan specifies 14 October 2011. September is the earliest maker-stated retail precision read.
Recording mediaBoth slots accept CFexpress Type A or UHS-I/UHS-II SD.Single slot accepting SD/SDHC/SDXC (UHS-I supported), Memory Stick PRO Duo and PRO-HG Duo
PortsUSB Type-C at 10 Gbps, Multi/Micro USB, full-size HDMI, 1000BASE-T Ethernet, sync terminal, 3.5 mm microphone and headphone sockets and digital-audio Multi Interface Shoe.USB 2.0 Hi-Speed, mini HDMI Type C, 3.5 mm stereo microphone input, wired remote, DC input and flash sync terminal; Auto-lock accessory shoe and optional infrared remote
Wireless connectionsWi-Fi IEEE 802.11a/b/g/n/ac at 2.4/5 GHz and Bluetooth 5.0.GPS geotagging is built into the SLT-A77V regional model represented by the Japanese specification and photograph.
Battery life detailNP-FZ100; Sony UK CIPA approximately 530 photographs with LCD or 400 with viewfinder. Japan lists 520/410 respectively. USB Type-C Power Delivery charging and power supported.NP-FM500H; CIPA maker claim approximately 470 photographs using the viewfinder or 530 using the LCD
Charging–Supplied BC-VM10A external charger
DimensionsApproximately 136.1 × 96.9 × 82.9 mm (width × height × maximum depth); grip-to-monitor depth 72.8 mm.Approximately 142.6 × 104 × 80.9 mm (width × height × depth), excluding protrusions
Weight detailSony UK specifies approximately 617 g body only or 702 g with battery and memory card; Japan specifies 618/703 g respectively. Main figures use the UK specification.Approximately 653 g body only; 732 g including battery and Memory Stick PRO Duo
Materials–Magnesium-alloy body with dust and moisture resistance measures; Sony does not guarantee complete resistance in all conditions
Colours–Black
In the boxNP-FZ100 battery, BC-QZ1 charger, power cord, cable protector, shoulder strap, body cap, accessory shoe cap and eyepiece cup, according to Sony UK.NP-FM500H battery, BC-VM10A charger, shoulder strap, eyepiece cup, USB cable and software CD; lenses depend on kit

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