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Sony Alpha 1 II vs Sony Alpha DSLR-A900

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

Better figure, where one is clearly better

SonyAlpha 1 IISonyAlpha DSLR-A900
Overview
ReleasedDecember 2024September 2008
Image and sensor
Camera typeMirrorlessDSLR
Sensor formatFull frameFull frame
Sensor typeStacked Exmor RS CMOS with integral memoryCMOS
Sensor dimensions35.9 × 24 mm35.9 × 24 mm
Effective resolution50.1 MP24.6 MP
Largest image8640 × 57606048 × 4032
RAW recordingYesYes
Standard ISO range100–32000200–3200
Sensor detailApproximately 50.5 million total pixels; Pixel Shift Multi Shooting uses four or 16 exposures combined in compatible computer software.Exmor CMOS; approximately 25.7 million total pixels; RGB primary-colour filter; anti-static coating and sensor-shift dust removal
Image formatsJPEG, HEIF and Sony ARW 5.0 RAW.JPEG, RAW (Sony ARW 2.1), compressed cRAW and RAW/cRAW+JPEG; 3:2, cropped 16:9 and approximately 11 MP APS-C crop. Sony’s Hong Kong launch PDF says ARW 2.0; the exact Japanese spec sheet and press table specify ARW 2.1.
ISO detailStandard ISO 100–32000 for stills and movies; stills expand to ISO 50–102400.Standard ISO 200–3200 in 1/3-stop steps, with expanded ISO 100–6400; Auto ISO 200–1600 with selectable limits
Image processorBIONZ XR and dedicated AI processing unit.Dual BIONZ image-processing engines
Lens and shooting
Lens mountSony E-mountSony A-mount
StabilisationSensor shiftSensor shift
Maximum continuous burst30 fps5 fps
Lens detail–Interchangeable Sony A-mount; compatible Sony, Minolta and Konica Minolta AF lenses. DT lenses trigger APS-C crop, but Sony does not guarantee full exposure performance with APS-C-only DT optics.
AutofocusUp to 759 phase-detection points for stills and movies; sensitivity EV −4 to 20 in AF-S with an F2 lens at ISO 100. Automatic or selected recognition of people, animals, birds, insects, cars, trains and aircraft. Sony's current feature page specifies Real-time Recognition AF+ from firmware version 4.00; launch reviews describe earlier firmware.TTL phase detection with nine selectable points (centre dual-cross) and ten non-selectable assist points; additional F2.8 precision sensor; single-shot, automatic and continuous AF, direct manual focus and manual focus; EV 0–18 detection at ISO 100; LED AF-assist lamp. AF micro-adjustment stores up to 30 lenses; no Eye-Start AF according to Sony’s exact Japanese table, despite the Hong Kong press table listing it.
Shutter–Electronically controlled vertical-traverse focal-plane shutter; 30 seconds to 1/8000 second plus Bulb; flash sync 1/250 second with stabilisation off or 1/200 second with it on; mirror-up drive mode
Burst detailUp to 30 fps electronic Hi+ with AF/AE tracking under compatible-lens and maker conditions; uncompressed or lossless-compressed RAW up to 20 fps; mechanical Hi+ up to 10 fps. Pre-Capture retains up to one second before full shutter press, subject to camera temperature and shooting conditions. A custom button can temporarily change burst speed.Up to 5 fps Hi or 3 fps Lo; maker buffer claims 285 Standard JPEGs, 105 Fine JPEGs, 11 Extra Fine JPEGs, 12 RAW/cRAW or ten RAW/cRAW+JPEG frames; depends on memory card and shooting conditions
Stabilisation detailFive-axis sensor shift; centre 8.5 stops and periphery 7.0 stops under CIPA 2024 pitch/yaw/roll conditions with FE 50mm F1.2 GM and long-exposure noise reduction off. Active and Dynamic Active movie modes narrow the field of view and are unavailable in 8K or at frame rates of 120 fps or higher.SteadyShot INSIDE sensor shift; Sony claims approximately 2.5–4 stops depending on lens and shooting conditions; excludes Minolta AF Macro Zoom 3X–1X F1.7–2.8
Flash–No built-in flash; proprietary Alpha flash shoe and PC sync terminal; ADI and pre-flash TTL with compatible external units. Wireless control requires an HVL-F58AM and another compatible flash.
Exposure controls–Program, aperture priority, shutter priority, manual and Auto; no scene modes; 40-segment honeycomb, centre-weighted or spot metering; ±3 EV compensation in 1/2- or 1/3-stop steps; D-Range Optimizer, 13 Creative Styles, Quick Navi and three saved shooting setups
Video
Highest video resolution7680 × 4320 at 30 fps–
Video detailSony's current feature page lists internal 7680 × 4320 30p XAVC HS with 8.6K oversampling and 10-bit 4:2:2 support. Lower-resolution 4K up to 120p has approximately 10% crop; Full HD 240 fps is lower resolution. S-Log3, S-Cinetone and imported LUTs supported; external HDMI RAW is separate from internal recording.Still-image DSLR without video recording or rear-screen live view; Intelligent Preview captures a temporary image for exposure, white balance and D-Range Optimizer simulation rather than a live feed
Screen and viewfinder
ViewfinderElectronicOptical
Screen size3.2″3″
Screen dots2,095,104921,600
TouchscreenYes–
Tilting screenYes–
Display detailFour-axis TFT LCD opens approximately 98° up, 40° down and 180° sideways, with 270° rotation when opened sideways.Fixed 3.0-inch Xtra Fine LCD, 921,600 dots (640 × 480 RGB subpixels), with anti-reflection coating; separate small 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 60/120/240 fps; standard magnification is unavailable at 240 fps.Fixed eye-level pentaprism; approximately 100% coverage and 0.74× magnification with a 50 mm lens at infinity; built-in eyepiece shutter; user-replaceable G/L/M focusing screens; optical depth-of-field preview
Connections and design
Wi-FiYes–
BluetoothYes–
Battery life (maker's claim)520 photographs880 photographs
Body weight658 g850 g
Release detailSony UK specifies availability in December 2024; no release day inferred. Exact technical figures use Sony Japan because the UK specification URLs were inaccessible during research.Sony Europe’s spokesperson told Photography Bay that main-market availability began at the end of September 2008; month precision retained. Regional maker announcements give October 2008 for Hong Kong and 23 October 2008 for Japan.
Recording mediaBoth slots accept CFexpress 2.0 Type A or UHS-I/UHS-II SD.Separate CompactFlash Type I/II (UDMA Mode 5) and Memory Stick Duo/PRO Duo/PRO-HG Duo slots; Microdrive support; user selects recording medium, without simultaneous dual-card recording (PhotographyBlog)
PortsUSB Type-C at 10 Gbps, Multi/Micro USB, full-size HDMI, 2.5GBASE-T Ethernet, sync terminal, 3.5 mm microphone and headphone sockets and digital-audio Multi Interface Shoe.USB 2.0 Hi-Speed; HDMI mini for still-image playback; NTSC/PAL video output; wired remote-release connector, flash sync and DC input; supplied software supports computer remote control
Wireless connectionsWi-Fi IEEE 802.11a/b/g/n/ac at 2.4/5 GHz and Bluetooth 5.0.–
Battery life detailNP-FZ100; Sony Japan CIPA approximately 520 photographs with LCD or 420 with viewfinder. PhotographyBlog's 530/400 figures are not used. USB Type-C Power Delivery charging and power supported.NP-FM500H; Sony CIPA claim approximately 880 photographs per charge; optional VG-C90AM grip holds two batteries. PhotographyBlog achieved barely half the claim during its review use.
Charging–Supplied BC-VM10 external charger; optional AC-VQ900AM adaptor/charger
DimensionsApproximately 136.1 × 96.9 × 82.9 mm (width × height × maximum depth); grip-to-monitor depth 72.8 mm.Approximately 156.3 × 116.9 × 81.9 mm (width × height × depth), excluding protrusions
Weight detailApproximately 658 g body only or 743 g with battery and memory card, excluding lens. PhotographyBlog's inconsistent 617 g figure is not used.Approximately 850 g without battery, memory card, lens or accessories; PhotographyBlog describes just under 930 g with battery, without providing a precise loaded figure
Materials–Magnesium-alloy front, rear and upper covers with aluminium internal chassis; seals reduce dust and moisture ingress. Sony explicitly says the camera is not waterproof or splash-proof.
Colours–Black
In the boxOne NP-FZ100 battery, BC-ZD1 dual-battery charger, cable protector, shoulder strap, body cap, accessory shoe cap and FDA-EP19/FDA-EP21 eyepiece cups, according to Sony Japan. USB Power Delivery AC adaptor and USB cable are not included.NP-FM500H battery, BC-VM10 charger and power cord, RMT-DSLR1 wireless remote, USB and video cables, shoulder strap, eyecup, remote clip, body and shoe caps, software CD

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