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The α900 (DSLR-A900) is a full-frame digital SLR camera, produced by Sony. An early design study of the camera was shown at PMA on 8 March 2007, and a newer prototype announced at PMA 2008 on 31 January 2008. Sony officially introduced the final camera on 9 September 2008 prior to photokina 2008. In October 2011, Sony Japan announced the camera's end of production.

Sony α 900
Alpha 900.jpg
Overview
TypeSingle-lens reflex
Lens
LensSony mount; compatible with Minolta A-type bayonet mount.
Sensor/medium
Sensor35.9 mm × 24.0 mm Exmor CMOS sensor
Maximum resolution24.6 megapixels
ASA/ISO rangeISO 100–6400
StorageMemory Stick: Memory Stick Duo, Memory Stick PRO Duo,

Memory Stick PRO-HG Duo

Compact Flash Type I, Type II (Microdrive), UDMA (Mode5) compliant
Focusing
Focus modesWide AF area, Spot AF area (center), Focus area selection (any of 9)
Focus areasTTL CCD line sensors (9-points, center dual cross types + 10 assist sensors)
Exposure/metering
Exposure modesMode: Auto, Program Auto (P, with program shift), Aperture priority (A), Shutter priority (S), Manual (M)
Exposure meteringTTL metering Cell: 40-segment honeycomb-pattern SPC

Range: 0 EV to 20 EV (+2 EV to +20 EV with Spot metering)

(at ISO 100 equivalent with F1.4 lens)
Metering modesMulti segment, Spot, Centre weighted
Shutter
ShutterElectronically controlled, vertical-traverse, focal-plane type
Shutter speed range1/8000 sec. – 30 sec., bulb
Continuous shooting5fps
Viewfinder
ViewfinderFixed eye-level system with optical glass type pentaprism, approximately 100%, 0.74x Magnification
General
Rear LCD monitor3.0", 921,600 dots
BatteryNP-FM500H Lithium-Ion rechargeable battery (1650 mAh)
Optional battery packsVertical Grip VG-C90AM
Weight850 g (30 oz)
Made inJapan

The specifications include: 24.6-megapixel CMOS sensor, 5 frame/s burst mode, dual BIONZ processors, 100% viewfinder, 9-point AF with 10 assist points, inbuilt image sensor shift stabilization and intelligent preview. It does not have video/movie recording.

Contents

Intelligent preview modeEdit

This mode, first introduced on the DSLR-A900, allows the photographer to take a sample image at the current settings. When this mode is enabled in the settings (default), then using the depth of field (DOF) preview button makes a preview image of the subject. The display shows the image and its image histogram, but it is not stored on the memory card. At that point, the photographer can accept current settings or simulate how the image (and histogram) would look with changes in aperture, shutter speed, dynamic range optimizer and white balance. If the photographer prefers those new settings he simply continues to work to accept them. Otherwise he can reject them by depressing the garbage can icon. He can also compare the sample to the simulation by depressing the DISP button.

Predecessor to the DSLR-A850Edit

The DSLR-A900 requires a labour-intensive alignment procedure in the factory in order to provide a 100% scene view in the viewfinder. In eliminating this costly procedure by masking the view to a slightly smaller area (98%) while also downspecifying the frame rate to 3 frames per second, the DSLR-A850 offers a camera with most of the benefits of the DSLR-A900 at a significant saving to the photographer.

External linksEdit