Product Description

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.

Product Details

• Amazon Sales Rank: #15628 in Camera & Photo
• Brand: Sony
• Model: DSLR-A900
• Dimensions: 9.00" h x 14.00" w x 12.00" l, 5.00 pounds
• Display size: 3
• Included Software: Yes

Features

• 35mm full-frame 24.6-megapixel Exmor CMOS image sensor
• Body only; lenses sold separately
• SteadyShot INSIDE in-camera image stabilization; Dual BIONZ processors for up to fast 5 fps performance
• 3.0-inch Xtra Fine LCD photo-quality display; Intelligent Preview Function reduces trial-and-error
• Accepts CompactFlash and Memory Stick Duo Media memory cards

Manufacturer Description

The flagship Sony A900 DSLR features a 35mm full-frame, 24.6-megapixel Exmor CMOS image sensor, as well as SteadyShot INSIDE, the world’s first body-integrated image stabilization solution for a full-frame DSLR, and Dual BIONZ imaging processors that deliver continuous shooting up to 5 fps with superb image quality and ultra-low noise. The A900 also offers a large, ultra bright glass pentaprism viewfinder with 100-percent 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 3.0-inch Xtra Fine LCD photo-quality (921K pixels) display and HDMI output with PhotoTV HD compatibility.

Sony Alpha A900 Highlights

Ultra-Fine Images As The Human Eye Perceives Them
The camera’s Exmor CMOS sensor delivers the photographic expressive power of wide angles and perspective that only a 35mm full-frame sensor can offer, and is designed to take advantage of the resolving power of high-precision a (alpha) lenses. Its high pixel count and large size provide enhanced image detail and a wider dynamic range for natural color reproduction and subtle tonal gradations.

The sensor is produced using proprietary Sony planarization technologies to ensure an ultra-flat surface across the entire imaging area. Instead of a single analog/digital convertor, the sensor uses over 6,000 on-chip, column-parallel A/D converters to convert analog signals to noise-resistant digital signals at the earliest possible stage. The result is reduced noise and high-speed transfer of data.

Image processing gets a boost in speed and power from the application of two BIONZ image processing engines. Large amounts of data captured by the 24.6-megapixel sensor can be quickly processed to achieve a fast shooting response. Additionally, this dual BIONZ processing system applies advanced noise reduction algorithms producing images of exceptional quality and detail, especially at high ISO sensitivities.

World’s First Anti-Shake System for a Full-Frame Sensor
The camera’s newly-developed, body-integrated SteadyShot Inside unit achieves an anti-shake effect equivalent to shutter speeds faster by 2.5 to 4 stops. This new unit provides stabilization for Sony, Minolta and Konica-Minolta wide angle, large-aperture lenses, which is difficult for lens-integrated systems.

State-of-the Art Optical Performance and Responsiveness

The ultra-bright viewfinder with 100-percent field-of-view coverage and 0.74x magnification enables accurate framing and preview. It features a high-power condenser lens, an eyepiece with high reflective-index glass, and a multi-layer, anti-reflective coating on every optical surface to deliver its extraordinarily bright and accurate view.

Additionally, the focusing screen is user-replaceable, with additional L-type (grid pattern) and M-type (super spherical acute matte) screens sold separately.

The camera’s newly-developed autofocus system consists of nine wide-area sensors with 10 assist points for improved tracking of moving subjects. A center dual cross sensor comprised of two horizontal and two vertical line sensors as well as a dedicated f/2.8 sensor are included to achieve greater precision, especially when using fast-aperture lenses.

It also offers high-speed continuous shooting of 24.6-megapixel images at five frames per second. A newly-designed mirror box features a unique parallel-link mirror mechanism that moves on two horizontal axes to accommodate both 100-percent viewfinder coverage and the body-integrated image stabilization system without increasing the camera’s size. The mirror box also has a new moving magnet actuator, a high-powered coreless motor for a faster shutter charge, and a magnet catcher to minimize mirror bounce and light refraction within the box.

Versatility to Unleash Creative Possibilities
The model’s innovative intelligent preview function takes the guesswork out of setting up a shot and the hassle of taking multiple shots to achieve a desired effect.

After pressing the depth of field preview button, the camera "grabs" a RAW preview image which is processed and displayed on the LCD screen. You can then fine tune white balance, determine the best level and effect of dynamic range optimization, adjust exposure compensation and check histogram data, all before you actually take the picture. Preview images are not recorded on the camera’s memory card, thus saving capacity.

Other key features aimed to expand creative options include the Dynamic Range Optimizer (DRO) with five levels of user-selectable correction as well as DRO bracketing for enhanced scene analysis and graduation optimization. EV bracketing with +/-2EV range makes it easy to create high dynamic range composite images.

Thirteen creative styles can be selected to enhance images and then fine-tuned by customizing contrast, sharpness, zone matching and other parameters, while 3 user-programmable memories provide instant access to as many as 26 different mode settings.

Powerful RAW file processing control is put in the photographer’s hands with the included Image Data Converter SR3 software that delivers faster file processing speeds, easy adjustment of image parameters, Dynamic Range Optimization and a new Peripheral Illumination function that compensates for corner light fall off.

With the camera’s HDMI output and Photo TV HD mode, your creative output can be enjoyed on a compatible HD television. This mode brings the look of actual printed photography to the television, by fine-tuning such image parameters as sharpness, gradation and color.

Comfort in Your Hands
Its construction features rugged, lightweight magnesium alloy with moisture-resistant, rubber seals for buttons and dials, an anti-static coating to prevent dust adherence to the imager, and a high-endurance shutter rated for more than 100,000 release cycles.

It has a 3-inch, Xtra Fine LCD screen (921K) makes it possible to check focus and image quality with accuracy. It incorporates an easy-to-see display with a quick navigation menu to easily access common functions without interrupting your creative flow. A backlit LCD panel sits on top of the camera and displays key settings.

System Expansion with New Accessories
The A900 camera will be accompanied with an array of accessories like the recently-announced Sony HVL-F58AM flash unit with its innovative Quick Shift Bounce system, powerful performance with a guide number of 58, and wireless auto flash ratio control.

The Sony VG-C90AM vertical grip offers the same ease of operation when shooting vertically as horizontally, with its button layout and low-position shutter-release button. It also houses two InfoLITHIUM batteries (sold separately) for longer shooting and playback.

More Alpha A900 Features

• The A900 features a 35mm full-frame Exmor CMOS image sensor that is approximately 2.35x larger than the APS-C sized sensors found in many DSLR cameras. The result is 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 and delivers sharper, higher contrast photos.
• Building on years of expertise, Sony has developed the world’s first body-integrated image stabilization solution for a full frame DSLR. The SteadyShot INSIDE in-camera image stabilizer actually shifts the image sensor to compensate for camera shake without sacrificing image quality. The compensation effect is equal to as many as four shutter speed steps, giving you more creative freedom when shooting in low light. And, because it is integrated into the camera body, SteadyShot INSIDE technology works with all compatible a (alpha)system lenses.
• The A900 harnesses the power of Dual BIONZ image processing engines to deliver true-to-life images with ultra-low noise and continuous shooting at up to 5 fps.
• A large, ultra-bright glass pentaprism viewfinder provides you with amazing clarity and high optical performance for tighter focus control. In addition, it offers viewfinder magnification of 0.74x, allowing you to see an image nearer to its actual size, as well as 100-percent field coverage for detailed framing work.
• The Intelligent Preview function allows you to see the effects of manual adjustments to exposure value, shutter speed, aperture, Dynamic Range Optimizer and White Balance before you take the shot, so you can determine the optimum settings before you take the shot, instead of losing time to trial-and-error.
• Review your images in stunning detail on the 3.0-inch Xtra Fine LCD display (921k pixels). With photo-quality resolution of 270ppi (pixels per inch), you can identify any necessary focus or exposure corrections at the time of capture, rather than discovering them when you transfer your images to your PC.
• The A900 provides direct HDMI output to your BRAVIA HDTV and other compatible HDTV screens, so you can view and share photos in breathtaking clarity and detail. Additionally, PhotoTV HD capable BRAVIA HDTVs will automatically optimize display settings, such as sharpness, gradation, and color to display your images in a way that more closely matches the natural look of printed photographs.
• A high-performance autofocus system uses 9 focus points (center dual-cross type) and 10 assist points to deliver fast and precise focusing.
• The A900 features an impressive design befitting a premium flagship model. The simple form eschews ornamentation and exudes competence, while the iconic pentaprism design element conveys superior optical performance. The A900 also incorporates a distinctive cinnabar-colored ring circling the lens mount -- a design element shared across every a (alpha) DSLR camera.
• The body of the A900 is entirely covered in a die-cast magnesium alloy shell, providing a rugged feel and surprisingly light weight.
• Sealed viewfinder optics and rubber gasket surrounds on all buttons, dials, and switches help resist the entry of dust and moisture into the camera, and allow for safe use in a wide range of environments.
• A supplied InfoLITHIUM lithium-ion battery provides long-lasting performance, allowing you to capture approximately 880 images on a single charge.
• The shutter mechanism in the A900 is designed to achieve shutter speeds up to 1/8000 seconds and proven for 100,000 cycle operation.
• The A900 features a dual card slots and accepts both CompactFlash and Memory Stick Duo Media (sold separately).
• A 40-segment multi-pattern metering system provides superior exposure control accuracy in a wide range of lighting conditions.
• To recover details in dark or bright areas of the image, the A900 provides multiple levels of Dynamic Range Optimization: Standard mode, to improve shadow detail using standard gamma curves; Advanced Auto mode, allowing you to select any of 5 DRO correction levels, or DRO Advanced Bracketing, which automatically takes three shots at different DRO levels with a single shutter press.
• Analog-to-digital signal conversion is performed by the full frame Exmor CMOS image sensor.
• In addition to digitizing analog signals, the full frame Exmor CMOS image sensor also performs both analog and digital noise reduction. This on-chip dual noise reduction process aids in the high speed transfer of noiseless digital signals.
• The autofocus system in the A900 features a highly-accurate F2.8 sensor for improved focus precision when using lenses faster than F2.8.
• Updated Image Data Converter SR3 software improves your workflow with faster RAW file processing and improved image correction.
• In addition to full frame image capture, the A900 can also crop images to the APS-C size format, allowing the use of lenses designed specifically for APS-C sized image sensors.
• Viewfinder magnification of 0.74x lets you see your subjects nearer to actual size.
• The A900 includes a built-in eyepiece shutter which can be shut to help shield against entering light and prevent exposure errors.
• AF Micro Adjustment allows you to fine tune focus for various lenses. The A900 can store adjusted focus values for up to thirty lenses.
• Optional Focusing Screens (sold separately): User-replaceable focusing screens for shooting specific subject types can be purchased as optional accessories.
• Mirror Lockup Mode raises the main mirror before exposure to reduce vibration at shutter release, resulting in better performance during long exposure shots of fireworks, stars, etc.
• The A900 allows you to bracket up to three exposures in 2.0EV-step increments.
• Sony drew upon its extensive experience designing and building heavy professional broadcasting camcorders to develop a rubberized grip that allows you to hold the A900 with comfort and confidence.
• The Image Data Lightbox software4 included with your a (alpha) DSLR helps you browse, rate, and compare your images, making it easier to select your favorites for further processing.
• Remote Camera Control allows you to control your A900 from your PC
• Sony Picture Motion Browser (PMB) software provides a simple and intuitive way to sort and archive your image collection, as well as perform common editing operations and output to data disc or the Web.
• Concentrate on your shooting and make adjustments on the fly thanks to convenient button placement. The ISO and White Balance adjustment buttons are located on the top of the camera body near the shutter button for easy thumb operation.

Customer Reviews

Biased Opinion
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
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 the RAW converter that is available as part of the DxO Optics Pro Elite version 5.3.6 (not version 5.0 or 5.1) software. This RAW converter provides much better noise suppression than can be obtained from the combination of the Adobe Camera RAW converter and Noise Ninja, to name one capable but certainly less powerful alternative for RAW conversion and noise suppression.

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, lenses and computer, the Sony A700 is another professional camera with a 12 megapixel half frame sensor. And, according to one comment to this review, Sony's recent firmware upgrade to the A700 now provides in-camera noise reduction that appears to be equivalent to that of the Nikon D300, a fact that makes the A700 a bargain at its current price of $999. Note, however, that unlike the Nikon D300 and the Sony A900, the A700 does not permit autofocus microadjustment.

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.

Sony Hits a Homerun
Competition is a very good thing and Sony just joined the professional full-frame DSLR competition with the a900 by hitting the ball out of the park.

I love this camera. It's got big, bright viewfinder thanks to a pentaprism that reminds me of the Nikon F that I owned many years ago. It's built solid as a brick - just like cameras were in the good old days

Sure, it's got twenty-four-and-a-half-million-pixels, but that's only part of the story. The files are excellent with lots of shadow detail and tack sharp thanks to the growing line of Zeiss lenses.