The α900 (DSLR-A900) is a full-frame

digital SLR A digital single-lens reflex camera (digital SLR or DSLR) is a digital camera that combines the optics and the mechanisms of a single-lens reflex camera with a digital imaging sensor. The reflex design scheme is the primary difference between a ...

camera, produced by

Sony , commonly stylized as SONY, is a Japanese multinational conglomerate corporation headquartered in Minato, Tokyo, Japan. As a major technology company, it operates as one of the world's largest manufacturers of consumer and professional ...

. 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 BIONZ is a line of image processors used in Sony digital cameras. It is currently used in many Sony α DSLR and mirrorless cameras. Image processing in the camera converts the raw data from a CCD or CMOS image sensor into the format that is sto ...

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 The depth of field (DOF) is the distance between the nearest and the furthest objects that are in acceptably sharp focus in an image captured with a camera. Factors affecting depth of field For cameras that can only focus on one object dist ...

(DOF) preview button makes a preview image of the subject. The display shows the image and its

image histogram An image histogram is a type of histogram that acts as a graphical representation of the tonal distribution in a digital image. It plots the number of pixels for each tonal value. By looking at the histogram for a specific image a viewer will be ...

, 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 The α850 (DSLR-A850) was Sony's second full-frame digital SLR, introduced on 27 August 2009. Similar to the DSLR-A900, the camera featured the same 24.6-megapixel full-frame CMOS sensor used in the a900. On 8 June 2011, Sony pre-announced th ...

offers a camera with most of the benefits of the DSLR-A900 at a significant saving to the photographer.

External links

Reviews

Sony A900 Preview
Production model reviewed by Alphamountworld

by Imaging Resource.com
Review
by

Digital Photography Review ''Digital Photography Review'', also known as ''DPReview,'' is a website about digital cameras and digital photography, established in November 1998. The website provides comprehensive reviews of digital cameras, lenses and accessories, buying g ...

Review
by

South China Morning Post The ''South China Morning Post'' (''SCMP''), with its Sunday edition, the ''Sunday Morning Post'', is a Hong Kong-based English-language newspaper owned by Alibaba Group. Founded in 1903 by Tse Tsan-tai and Alfred Cunningham, it has remained ...

Full-length review
by DigitalCameraInfo.com

News

Sony A900 and Zeiss Lens Updates

Sony Develops 35 mm full size CMOS Image Sensor with 24.81 Effective Megapixels

Sony A900 ad reveals 24.6MP sensor
{{Full-frame DSLR cameras

900 __NOTOC__ Year 900 ( CM) was a leap year starting on Tuesday (link will display the full calendar) of the Julian calendar. Events By place Abbasid Caliphate * Spring – Forces under the Transoxianian emir Isma'il ibn Ahmad are v ...

Cameras introduced in 2008 Full-frame DSLR cameras