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.

Technical Details

-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
See more technical details

 "The Alpha of the digital pack" 2010-07-10
By K. Jorgensen
Best bang for the buck. I have other legacy cameras from Nikon, but for simplicity and execution the Sony works well for me. Forget about noise., that discussion is a big yawn. Unless it's sports that pays your bills, this Sony hangs with the rest of them. I use Raw Photo Processor to work on my files, and CS5 to finish with.


 "Sony Alpha A900 (AlphaMountWorld Review)" 2009-09-21
By Carlton D. Garrard (Rancho Santa Margarita, CA, United States)
Ultimately the Sony A900 was built for Minoltan's who wanted a full frame upgrade path to the discontinued KM 7D. In a sense, this camera is a confluence of that camera, the Sony A700, and the Minolta Maxxum 9 film camera- that never saw a digital Minolta equivalent come to life.

Sony's Alpha A900 represents performance value. It is a high end/professional DSLR with a rather conservative feature set when compared to its peers on the market. It does not offer live view or video, instead it offers arguably the best 100% coverage viewfinder in a DSLR to date, excellent 24.6mp resolution, the worlds only image stabilized full frame sensor, excellent Quick-Navi Gui interface, top notch build quality, and large easy to use external controls.

Handling is excellent and intuitive. The A900 is built to handle an extreme range of weather conditions with an excellently sealed body. The external buttons are designed to be larger on purpose, and spaced out so that it can be used with gloves on in cold weather situations (it definitely passed my test in the Sierras).

Build quality on the A900 is top notch, all external panels and framework are made from an advanced Magnesium Alloy, giving an overall excellent strength to weight ratio. The grip is large and comfortable with recesses for the fingertips on the right hand that aid in portrait shooting and overall ease of grip, reassuring less hand fatigue for all day shooting for all hand sizes.

The design itself is rather compact for a full frame camera (without the vertical grip) when compared to its peers, yet is large enough to let you know that this is one serious camera for advanced enthusiasts and professionals (even though Sony is careful not to classify it strictly for professional use). Add a vertical grip to it, and it is actually larger than Canon or Nikon's largest professional cameras by a hair. The vertical grip is probably one of the best designs ever made, nearly perfectly mimicking the back panel of the A900 itself and is very comfortable.

Autofocusing is by way of a diamond arranged 9 AF points, with the center point being optimized for a f/2.8 aperture. The surrounding 8 points have been increased in sensitivity compared to the A700, for more reassuring AF performance. The speed of the in body focus motor is snappy, and the overall speed of the autofocus varies depending on the lens itself (due to different internal gearing and programming, etc.

The A900 has 3 custom presets built into the main menu dial that are quickly accessible, but the bread and butter of your adjustments will be made the way of the Quick Navi system which employs the LCD and use of thumb and front wheels and/or the multi controller joystick. Adjustments can be made to most functions without having to go one level into the menu system, which saves time and headache in moments you need to make quick decisions.

The Alpha A900 boasts an overall impressive feature list. It will shoot 5 frames per second at full 24.6mp resolution on Jpegs until the memory card is used up, ISO sensitivity ranges from 100-6400, has an excellent low light autofocusing illuminator, intelligent preview function for making changes to WB/exposure/DRO etc., lens micro AF adjustment (with memory up to 30 lenses), HDMI output, dual memory card slots, sensor based dust reduction, APS-C capture mode, 1/300th sec flash sync, built in viewfinder shutter (to black out light on long exposures), user changeable focus screens (with 3 total optional screens), 880 shot per charge battery life, 3" 920K dot LCD screen, a top deck illuminated LCD panel, comes with a wireless remote, and much more.

In use, the A900 is designed to be intuitive and is, it is simple enough so that it won't leave you perplexed but featured enough to handle most job situations. While the current trend is to add video and other such gizmos to DSLR designs, the A900 remains conservative. Film SLR users will feel right at home.

To me the A900 is more utilitarian in design, and less about a features war with competitors. Sometimes I wish it had more creative software features or live view, but I never miss video on it. Intelligent Preview is good enough to replace the live view feature for many applications although not all, such as zoom micro focus aid, but it gets most of the job done and helps to save storage space by not having to take several test frames.

In a way the Sony A900 is an old fashioned DSLR with just the right amount of modernization, which may throw some who expected the opposite from Sony for a loop. The A900 is reliable, right out of the box. It has not exhibited any focusing issues or firmware/hardware errors once. It is a well designed camera in this aspect, and reliability is first on my order checklist. It does all I need it to do for most circumstances.

Image Quality is simply fantastic. As long as your sensitivity needs aren't higher than ISO 3200 for nearly noise free images, the A900 will impress you with color gradation, excellent dynamic range, and mind boggling detail. Raw files are out of this world good and compare well to medium format rigs costing thousands and thousands of dollars more.

This camera is for the enthusiast with deep pockets, a budding professional, or a professional that wants a lot of camera for the buck. It is really hard to find any faults with this camera within its specification sheet, a real joy to use and own.

Strengths:
Build
Features for price
Viewfinder
Speed
Image Quality (ISO 3200 and under)
Resolution is extraordinary (close to medium format DSLR backs)
Noise reduction can be turned off
Lightest in class
Excellent LCD Panel
Well thought out controls
Built in Full Frame Image Stabilization (2-4 stops advantage)
A landscape shooters dream DSLR (weight, size, resolution)
Reassuring mechanical mirror/shutter cycle sound
Has character and some old fashioned heritage
AF Zeiss Lenses

Weaknesses:
No live view (if thats for you)
Jpeg Image Quality above ISO 3200
Tends to underexpose .3-.7 EV (at least consistently)
Proprietary flash shoe (although superior in design- locks on flash heads etc)
AF motor drive in camera can be a bit noisy
Mirror slap is also a bit loud
No pop up flash (debatable weakness)



- Carl (see more at alphamountworld)


 "A stunning camera" 2009-05-22
By Mark Olwick (Seattle, WA USA)
The Sony A900 is a camera built for photographers. Wonderfully agile, great ergonomics and stunning image quality. It does require the high-end lenses to get the most out of that resolution though, so factor that into your budget. Both the 24-70 and 70-300 operate beautifully on the A900.

The thing I like about the A900 over the Nikon D700 or Canon 5D Mk2 is how fast I can work with it. The camera just "gets out of the way". No endless pages of menus like the Nikon D700, and the quick access screen/joystick combination makes adjustments on the fly quick and easy.

I was also pleasantly surprised with the high ISO image quality. After reading some of the reviews I was hesitant, but I got very nice images up to ISO 1600.

The preious mentions about the file sizes are correct - you'll also need a fast computer to process them and 16GB memory cards.

But in the end, this is by far my favorite "affordable" Full Frame digital camera.


 "Love the camera - where is the manual?" 2009-01-12
By Dr. Glenn (Silver Spring, MD USA)
I've been shooting the A900 with most of the Minolta 'G' lenses and especially like its capabilities with the F 2.8 300 mm G for birding and wildlife. I have one gripe. The "manual" for the camera is less substantial than those for the A100 or the A700. With the time Sony took to get this fine beast to market you would think they would have a full featured companion manual and have provided code for Adobe, Microsoft et al to render its RAW output. Here I am with Vista 64 and 8 Gig of ram and Vista and Lightroom both balk at the RAW output. I love the product but want a professional level back to be more integrated with the other tools sophisticated users employ. Cannon would not be caught this way with a new high end product. Kudos to the Minolta engineers for continuing to refine the surperb ergonomics but help us fully utilize what's been achieved in hardware in the field!


 "Sony Hits a Homerun" 2009-01-05
By Brian Smith (Miami Beach, Florida USA)
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.


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