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 mechanisms of a single-lens reflex camera with a solid-state image sensor and digitally records the images from the sensor. The reflex des ...

camera, produced by

Sony is a Japanese multinational conglomerate (company), conglomerate headquartered at Sony City in Minato, Tokyo, Japan. The Sony Group encompasses various businesses, including Sony Corporation (electronics), Sony Semiconductor Solutions (i ...

. 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 The depth of field (DOF) is the distance between the nearest and the farthest objects that are in acceptably sharp focus (optics), focus in an image captured with a camera. See also the closely related depth of focus. Factors affecting depth ...

(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 Lightness (color), tonal distribution in a digital image. It plots the number of pixels for each tonal value. By looking at the histogram for a specific ima ...

, 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

Reviews

Sony A900 Preview
Production model reviewed by Alphamountworld

by Imaging Resource.com
Review
by Digital Photography Review
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 remaine ...

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 of the Julian calendar. Events By place Abbasid Caliphate * Spring – Forces under the Transoxianian emir Isma'il ibn Ahmad are victorious at Balkh (Northern Afghan ...

Cameras introduced in 2008 Full-frame DSLR cameras