Sony Alpha 900

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Sony α 900

Type	Single-lens reflex
Sensor	35.9 mm × 24.0 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
Storage	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 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.

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.

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 saving to the photographer.

External links

Media related to Sony DSLR-A900 at Wikimedia Commons

Reviews

Sony A900 Preview Production model reviewed by Alphamountworld
by Imaging Resource.com
Review by Digital Photography Review
Review by South China Morning Post
Full-length review by DigitalCameraInfo.com

News

Minolta/Konica Minolta/Sony DSLR and SLT A-mount timeline

	Sensor	2004		2005				2006				2007				2008				2009				2010				2011				2012				2013				2014
		3	4	1	2	3	4	1	2	3	4	1	2	3	4	1	2	3	4	1	2	3	4	1	2	3	4	1	2	3	4	1	2	3	4	1	2	3	4	1
High-end	Full frame																		α900																					HV
																							α850												α99
Advanced	APS-C	DG-7D												α700																α77
Midrange																														α65
																										α55							α57
						DG-5D			α100													α550				α580										α58
																						α500				α560
																								α450
Entry-level																										α33				α35				α37
																α350					α380				α390
																α300					α330
																α200					α230				α290
Early models	Minolta 7000 with SB-70/SB-70S (1986) · Minolta 9000 with SB-90/SB-90S (1986) (Still video SLRs) Minolta MS-C1100 (1992) · Minolta RD-175 (1995)

Single-lens translucent (SLT) camera
HD video capable (Video AF)
Dual phase-detection AF (italic)

Full-frame DSLR cameras

Pentax

MZ-D (Prototype, 2000)

Contax

N Digital (2002)

Kodak

DCS Pro 14n (2002)
DCS Pro SLR/n (2004)
DCS Pro SLR/c (2004)

Canon

Flagship	1Ds (2002) 1Ds Mark II (2004) 1Ds Mark III (2007) 1D X (2012) 1D C (2012)

High-end	5D (2005) 5D Mark II (2008) 5D Mark III (2012)

Entry-level	6D (2012)

Nikon

Flagship	D3 (2007) D3X (2008) D3S (2009) D4 (2012)

High-end	D700 (2008) D800 (2012) D800E (2012) Df (2013)

Entry-level	D600 (2012) D610 (2013)

Sony

Flagship	α 900 (2008) α 99 (2012)

High-end	α 850 (2009)

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