| The Sony A900 is the top-of-the-line model in the Sony α (alpha) DSLR lineup. As befits a flagship model, the A900 raises the bar in a number of areas. In addition to being the first α DSLR to incorporate a 35mm full frame image sensor, it features the worlds highest 24.6-megapixel (MP) resolution and the worlds first body-integrated full-size SteadyShot INSIDE image stabilization technology. The new full frame Exmor CMOS image sensor is significantly larger than traditional APS-C sized sensors, providing a larger capture area, improved wide-angle performance, and tighter depth of field control. In addition, its 24.6MP resolution maximizes the resolving power of your existing lenses for sharper, higher contrast photos. The A900 also features Dual BIONZ imaging processors that allow continuous shooting at up to 5 fps (frames per second) with superb image quality and ultra-low noise, a large, ultra bright glass pentaprism viewfinder with 100% coverage, an Intelligent Preview function that lets you see the effects of manual adjustments on an image before you take the shot, and best-in-class viewing with a photo-quality 3.0” Xtra Fine LCD (921K pixels) display and HDMI output with PhotoTV HD compatibility. |
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 Biased Opinion |
| Review Date: November 29, 2008 |
| Reviewer: wes, Fabulous Las Vegas |
Let me start by saying that I teach a digital photography class at the local community college, and I've seen/used/taught about every major brand and many minor brands of digital cameras, and I think every manufacturer makes a camera that is right for different people with different requirements. That being the case, the alpha900 is amazing. The resolution is not only record breaking, but the clarity of each of those pixels is quite good (with the right lens). The image stabilization on a full-frame sensor is a first (and so far, only). 5 Frames per second? At 24.6 megapixels? It is a testament to Sony's knowledge of electronics. The view finder really does exemplify why "live view" is more of a marketing checklist item, and not really necessary; looking through the view finder is a joy.
But, the world of the a900 isn't all roses. If you have a collection of Sony/Minolta lenses, hopefully they're all full-frame. Yes, the a900 supports APS-C lenses, but there is no real advantage to them with this body over other Sony DSLRs. The a900 does "find focus" better than previous Sony DSLRs, but the location of the focus points aren't as well laid out as other Sony models. While I usually carry an external flash, so the lack of a pop-up flash isn't a problem for me, many users will find the lack of one to be, at least, an annoyance.
And last, but certainly not least, is post production once the images are off of the camera. If you primarily shoot in RAW (as I do), and do much post-production, be prepared to bring your computer to it's knees. These files are huge, and all that wonderful resolution comes at cost; that being the amount of pure computing horsepower required.
Given those few caveats, the alpha900 really is a big step forward in digital SLRs, in many ways. If you can justify the cost of this body, it really is worth having, and you'll be surprised at just how much detail a single image can have when its almost 25 megapixels. |
Sony's Flagship Camera
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| Review Date: November 10, 2008 |
| Reviewer: Photo/Video Gearhead, |
Sony has finally claimed the high ground with its long awaited full frame sensor. And at 24 megapixels, this sensor probably achieves the nominal resolution of 35 mm color film. According to Digital Photography Review, this sensor achieves a resolution of 2,700 lines per 24mm of sensor height, which equals 2,700*25.4/24.0=2,858 lines per inch.
This camera is well built with plenty of buttons to control its functions. It is easy to use and produces stunning picture quality when used with high end Zeiss, Sony or Minolta lenses. When used in continuous shooting mode, the camera captures 5 RAW images per second for 3 seconds, for a total of 15 images, before its image buffer fills and the image capture rate becomes limited by the speed of the Compact Flash card.
However, the A900's high resolution sensor is somewhat susceptible to noise. Packing 24 megapixels into this full frame sensor means that each pixel collects less light per unit time than does each pixel of a 12 megapixel full frame sensor. In consequence, the 24 megapixel full frame sensor is less immune to noise than the 12 megapixel full frame sensors of the Canon 5D or Nikon D700 cameras. When no in-camera noise reduction is applied by the A900, noise becomes apparent at ISO 800 and objectionable at ISO 1600. However, it is possible to extend the usable ISO range to 1600 or 3200 through the use of at least these three RAW converters: (1) Image Data Converter SR version 3 that Sony has released for free download, (2) DxO Optics Pro Elite version 5.3.6, 5.3.7 or 6, or (3) Adobe Lightroom 3. To my eye, the Sony Image Data Converter SR version 3 achieves slightly better noise suppression than the other two options.
The A900 places large demands on the computer where images are stored and post processed. The best image quality is obtained from RAW mode which consumes 36 megabytes per image file and stores 12 bits per pixel. Compressed RAW (cRAW) mode, which consumes 24 megabytes per image file and appears to store only 8 bits per pixel may be less useful for subsequent photo editing. And opening one of these 36 megabyte RAW image files using Adobe Photoshop can be time consuming. I have upgraded my 1.5GHz PowerPC G4 Mac mini to a 2.0GHz Intel Core 2 Duo Mac mini in order to decrease the time required to open a RAW image file to a reasonable delay.
The high resolution of the 24 megapixel sensor is achievable only with high end lenses such as the Zeiss 85mm f1.4, 135mm f1.8, 24-70mm f2.8 and 16-35mm f2.8 lenses, as well as the Sony G and Minolta G lenses. My own measurements with the Imatest lens test software reveal that many of the lower quality, non-G Minolta lenses (and presumably also the equivalent Sony lenses) are not sharp enough to exploit the high resolution sensor. Exceptions to this statement include the Minolta 28mm f2, 35mm f2, 50mm f1.4, 100mm f2.8 macro, 100mm f2.8 soft focus and 70-210mm f4 lenses, which are not G lenses but approach G in quality. Nevertheless, be prepared to purchase an expensive set of lenses if you want to get the most out of the A900. And be certain to perform autofocus microadjustment on all of your lenses using the LensAlign focus calibration system if you want to get the most out of each lens.
For these reasons, the A900 is a camera best suited to those who demand, and are willing to pay for the highest possible resolution from a digital SLR. For those who would prefer to invest less money in the camera while obtaining the same resolution, the Sony Alpha DSLRA850 24.6MP Digital SLR Camera (Body Only) is another professional camera with the same full frame sensor as the A900 but which can capture only 3 frames per second instead of 5, and which has a 98% viewfinder instead of a 100% viewfinder.
One final recommendation: the Sony Alpha PCK-LH4AM LCD Protective Cover (Transparent) is an inexpensive way to protect the expensive LCD screen of the A900. I have used my A900 for less than one year, and despite the fact that I treat my A900 with great care, I am amazed at the large number of dings and scratches that have appeared on the LCD protective cover. Were it not for the presence of the cover, those dings and scratches would be etched into the LCD screen itself.
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