Sony Alpha 900

Sony Alpha 900
Sony α 900
Alpha 900.jpg
Type Single-lens reflex
Sensor 35.8 mm × 23.9 mm Exmor CMOS sensor
Maximum resolution 24.6 megapixels
Lens Sony mount; compatible with Minolta A-type bayonet mount.
Shutter Electronically controlled, vertical-traverse, focal-plane type
Shutter speed range 1/8000 sec. – 30 sec., bulb
Exposure metering

TTL 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)
Exposure modes Mode: Auto, Program Auto (P, with program shift), Aperture priority (A), Shutter priority (S), Manual (M)
Viewfinder Fixed eye-level system with optical glass type pentaprism, approximately 100%, 0.74x Magnification
ASA/ISO range ISO 100–6400
Rear LCD monitor 3.0", 921,600 dots

Memory Stick: Memory Stick Duo, Memory Stick PRO Duo, Memory Stick PRO-HG Duo

Compact Flash Type I, Type II (Microdrive), UDMA (Mode5) compliant
Battery NP-FM500H Lithium-Ion rechargeable battery (1650 mAh)
Weight 850 g (30 oz)
Optional battery packs Vertical Grip VG-C90AM
Made in Japan

The α900 (DSLR-A900) is Sony's current flagship digital SLR. 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.

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.


Intelligent Preview Mode

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-A850

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 savings to the photographer.

External links

Media related to Sony DSLR-A900 at Wikimedia Commons



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