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Sony Alpha SLT-A57 vs Sony Alpha SLT-A99

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

Better figure, where one is clearly better

SonyAlpha SLT-A57SonyAlpha SLT-A99
Overview
ReleasedApril 2012October 2012
Image and sensor
Camera typeTranslucent mirrorTranslucent mirror
Sensor formatAPS-CFull frame
Sensor typeExmor APS HD CMOSExmor CMOS
Sensor dimensions23.5 × 15.6 mm35.8 × 23.9 mm
Effective resolution16.1 MP24.3 MP
Largest image4912 × 32646000 × 4000
RAW recordingYesYes
Standard ISO range100–16000100–25600
Sensor detail16.7 million total photosites; fixed translucent mirror feeds a dedicated phase-detection AF sensor while the main sensor supplies live view24.7 million total photosites; fixed translucent mirror directs light to the dedicated phase-detection AF module while the main sensor supplies live view
Image formatsJPEG, RAW (Sony ARW 2.3), RAW+JPEG and 3D MPO panoramas; 3:2 or 16:9 stillsJPEG including Extra Fine, 14-bit RAW (Sony ARW 2.3) and RAW+JPEG; 3:2 or 16:9 stills; no 3D panorama
ISO detailAuto ISO 100–3200; multi-frame noise reduction extends sensitivity to ISO 25600; movies ISO 100–3200Standard ISO 100–25600; expanded ISO 50, 64 and 80; multi-frame noise reduction ISO 100–51200; movie sensitivity ISO 100–6400 or Auto ISO 100–3200
Image processorBIONZBIONZ with front-end LSI
Lens and shooting
Lens mountSony A-mountSony A-mount
StabilisationSensor shiftSensor shift
Maximum continuous burst10 fps6 fps
Lens detailCompatible Sony, Minolta and Konica Minolta A-mount AF lenses; kit lenses are separate from body specificationsSony, Minolta and Konica Minolta A-mount AF lenses; APS-C crop mode available; kit lenses are separate from body specifications
Autofocus15-point phase-detection AF with three cross sensors; EV −1–18 at ISO 100 with an F2.8 lens; AF-S, AF-A, AF-C and manual focus; zone and local selection, tracking AF and Eye-Start19 dedicated phase-detection points including 11 cross sensors, with 102 on-sensor assist points; AF-D and assist points require supported lenses and firmware. AF-S, AF-A, AF-C, AF-D, direct manual and manual focus; AF range limiter and AF micro-adjustment; EV −1–18 at ISO 100 with an F2.8 lens
Shutter1/4000–30 seconds and Bulb; flash sync 1/160 second1/8000–30 seconds and Bulb; flash sync 1/250 second; selectable electronic first curtain; maker-tested approximately 200,000 shutter operations
Burst detailUp to 12 fps with full-time continuous AF in Tele-zoom Continuous Advance Priority AE: 1.4× centre crop, medium/small JPEG only. Full-resolution Continuous Advance Priority AE reaches 10 fps; ordinary drive 8 fps Hi or 3 fps Lo. Maker buffer claim at 10 fps: 23 Fine JPEG, 27 Standard JPEG, 21 RAW or 18 RAW+JPEG frames; cropped 12 fps: 23 Fine or 25 Standard JPEG frames. In the 10/12 fps AF modes aperture is controlled to f/3.5, or the maximum aperture of a slower lens; the 12 fps maximum image is approximately 8.4 MP.Full-frame continuous shooting up to 6 fps, APS-C up to 7 fps, or 2.5 fps Lo. Tele-zoom Continuous Advance Priority AE offers 8 fps at approximately 10 MP or 10 fps at approximately 4.6 MP; 10 fps is JPEG only. With UHS-I SD and ISO 320 or lower, or high-ISO noise reduction off, full-frame Hi buffer is 15 Extra Fine, 24 Fine or 29 Standard JPEGs, 15 RAW or 12 RAW+JPEG; Auto ISO with normal noise reduction reduces this to 11/12/12/10/8 frames respectively
Stabilisation detailSteadyShot INSIDE sensor shift for stills, maker claim approximately 2.5–4.5 stops; electronic stabilisation for moviesSteadyShot INSIDE sensor shift for stills, maker claim approximately 2.5–4.5 stops; electronic stabilisation for movies
FlashAutomatic pop-up flash, guide number 10 in metres at ISO 100; ADI and pre-flash TTL control; compatible external flash required for wireless flash and high-speed syncNo built-in flash; compatible external flash uses ADI or pre-flash TTL; Multi Interface Shoe, with supplied ADP-MAA adapter for Auto-lock accessories
Exposure controlsPASM, Intelligent Auto, Superior Auto, scene and panorama modes; 1200-zone metering; ±3 EV compensation in 1/3 steps; three-frame Auto HDR, D-Range Optimizer, Picture Effects and Auto Portrait FramingPASM, automatic, scene, panorama and tele-zoom continuous AE modes; 1200-zone metering; ±5 EV exposure compensation in 1/3 or 1/2 steps; D-Range Optimizer and Auto HDR
Video
Highest video resolution1920 × 1080 at 60 fps1920 × 1080 at 60 fps
Video detailJapan/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.Japan/NTSC: Full HD AVCHD 2.0 at 60p/28 Mbps, 60i/24 or 17 Mbps, and 24p/24 or 17 Mbps; MP4 up to 1440 × 1080 at 30 fps. A/S/M movie exposure requires manual focus; continuous phase-detection AF uses automatic exposure. Clean uncompressed HDMI output can operate alongside internal recording; recording limit approximately 29 minutes or 2 GB per file
AudioBuilt-in stereo microphone with wind-noise reduction, external stereo microphone input and mono playback speakerBuilt-in stereo microphone, external stereo microphone input, headphone output, adjustable audio recording level and level display; mono playback speaker
Screen and viewfinder
ViewfinderElectronicElectronic
Screen size3″3″
Screen dots921,6001,228,800
TouchscreenNoNo
Tilting screenYesYes
Display detailXtra Fine LCD with 180° tilt and 270° rotation on a bottom hinge; focus peaking and magnification; dots count colour subpixelsThree-axis WhiteMagic RGBW LCD tilts 140° upwards or 180° forwards and rotates 180° right or 90° left; 1,228,800 dots count colour subpixels; separate top status LCD
Viewfinder detail0.46-type SVGA electronic finder, 100% coverage; 1,440,000 effective dots at maximum magnification (1.04× with a 50 mm lens), or 1,253,280 at standard magnification (0.97×); electronic level and grids0.5-type XGA OLED Tru-Finder with 2,359,296 dots, 100% coverage and approximately 0.71× magnification with a 50 mm lens; focus peaking and magnification
Connections and design
Wi-Fi–No
Battery life (maker's claim)550 photographs410 photographs
Body weight539 g733 g
Release detailSony UK specifies early April 2012 for European availability; Japan’s revised announcement specifies 27 April 2012. April is the earliest maker-stated retail precision found.Sony Korea announced late-October 2012 retail availability; Sony Japan specifies 26 October 2012. October is the earliest maker-stated on-sale precision read
Recording mediaSingle slot accepting SD, SDHC, SDXC, Memory Stick PRO Duo and PRO-HG DuoTwo SD/SDHC/SDXC slots with UHS-I support; one also accepts Memory Stick PRO Duo/PRO-HG Duo; simultaneous backup and RAW/JPEG separation available
PortsUSB 2.0 Hi-Speed, mini HDMI Type C, 3.5 mm stereo microphone input, wired remote and DC input; optional infrared remote; Auto-lock accessory shoeUSB 2.0 mini-B, mini HDMI Type C, 3.5 mm microphone and headphone sockets, remote, DC input and flash sync terminal; Multi Interface Shoe
Wireless connections–SLT-A99V incorporates GPS geotagging; Japanese specification and photograph represent this regional model
Battery life detailNP-FM500H; CIPA maker claim approximately 550 photographs using the viewfinder or 590 using the LCDNP-FM500H; CIPA maker claim approximately 410 photographs with the viewfinder or 500 with the LCD; optional VG-C99AM grip holds two additional batteries
ChargingSupplied BC-VM10A external chargerSupplied BC-VM10A external charger
DimensionsApproximately 132.1 × 97.5 × 80.7 mm (width × height × depth), excluding protrusionsApproximately 147 × 111.2 × 78.4 mm (width × height × depth), excluding protrusions
Weight detailApproximately 539 g body only; 618 g including battery and Memory Stick PRO DuoApproximately 733 g body only; 812 g including battery and Memory Stick PRO Duo
Materials–Magnesium-alloy body with dust and moisture resistance measures; complete resistance is not guaranteed
ColoursBlackBlack
In the boxNP-FM500H battery, BC-VM10A charger, shoulder strap, eyepiece cup, USB cable and software CD; lenses depend on kitNP-FM500H battery, BC-VM10A charger, USB cable, ADP-MAA shoe adapter, accessory shoe cap, shoulder strap, body cap, eyepiece cup and software CD

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