While I doubt that the Sony Alpha A900 will tempt many professional Canon and Nikon shooters to switch systems due to limitations in the Sony lens lineup (for example no 400/2.8, 500/4, 600/4 or 800/5.6 lenses that are the lenses needed by sports and nature shooters), and also due to the costs associated with switching systems, it would be very tempting for someone with no prior investment in other camera systems. 100-25600) and we don't yet know much about AF or noise performance. On the other hand, it has a more limited ISO range than the D700 (100-6400 vs. As of right now though, it seems to set the standard to beat for "affordable" full frame DSLRs with more than double the pixel count of the $3000 Nikon D700 plus built in image stabilization and 5fps operation. The Sony Alpha A900 is very impressive on paper but we'll have to wait for a full test of a production model to see how it performs in the field. I'd expect Canon to be releasing details of the 5D MkII within the next week or so. However, I expect the new Canon EOS 5D MkII (which may be called the EOS 7D, or 3D or something else!) to have a full frame sensor of around 21MP and a similar $3000 street price. The only currently comparable sensor is the one used by Canon in their $8000 1Ds MkIII. The Sony Alpha A900 price is $2999.99, which is certainly a breakthrough for a full frame camera with such a high resolution sensor. Despite the massive amounts of data which have to be stored for each 24.5 MP frame, the A900 can shoot at 5 frames per second (it uses dual Bionz image processing chips to handle the data load). When it comes to continuous shooting the Sony Alpha A900 is no slouch either. Unless Canon gave worked some tricks with the 5D MkII mirror, it's unlikely to be able to mount or use EF-S lenses since they protrude further into the camera body than full frame EF-S lenses and so mechanically interfere with both the body itself and the SLR mirror. Operating in the 1.5x crop sensor mode, the image will be around 10.6MP. Like the Nikon full frame DSLRs the Sony Alpha A900 can use lenses designed for APS-C crop sensor cameras by only using the center part of the full frame sensor. Sony claim that the system used in the A900 works even better than that in its crop sensor bodies and can provide up to 4 stops of additional stability. While stabilized lenses have some advantages (a stabilized viewfinder image for example), a stabilized body such as the Sonty Alpha A900 provides stabilization will ALL lenses with no additional cost and makes a stabilized system with wideangle and normal primes possible, something the Canon and Nikon systems cannot do since no optically stabilized wideangle and normal primes are available. This contrasts with Canon and Nikon systems which depend on stabilized lenses ("IS" for Canon, "VR" for Nikon). In a "retro" looking package the Alpha A900 uses Sony's own 24.5MP full frame (36mm x 24mm) sensor and the A900 is the first and only full frame DSLR with "sensor shift" technology which physically moves the sensor to compensate to camera movement, making a stabilized system with any lens mounted on the camera. Earlier this year they promised it would be available by the end of 2008 and they have come though with the new Sony A900. Sony have now released full details of their new Alpha A900 24MP full frame DSLR with built in image stabilization.
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