Sony Alpha DSLR-A900 Review

In the cut-throat digital camera market it's increasingly unusual for products to be shown in prototype form or announced more than a matter of weeks before they hit the stores. There's several reasons for the manufacturers' habit of playing their cards so close to their chests, not least that they can't afford to harm sales of the models they've already released. Sony, the newest 'new kid' on the DLSR block, has no such worries, this being its first proper 'high end' DSLR. In fact, if anything the pressure was on the company to show it was committed to becoming a major SLR system player and that it wasn't going to squander Minolta's long legacy in this market after picking up the assets Konica Minolta shed when it pulled out of the photography market. Thus we saw the first prototype of the Alpha 900 - Sony's flagship full frame digital SLR - back in early 2007 (it appeared behind glass at trade shows such as PMA in March 07), and information has been trickling out ever since; most significantly with the announcement in January of this year of a 35mm full frame CMOS sensor.

And so when Sony finally showed the finished Alpha 900 to us back in the late summer there were few surprises at the basic specification or the appearance of the camera. As we started to dig a little deeper, pore over the fine print and actually use the Alpha 900 we were, however, increasingly surprised - and almost always pleasantly so - at some of the decisions made by Sony's engineers when designing its flagship SLR.

Key features

• 24.6 MP 35mm format full-frame CMOS sensor (highest res in class)
• SteadyShot INSIDE full frame image sensor shift stabilization (world first)
• High Speed Dual Bionz processors
• Eye-level glass Penta-prism OVF, 100% coverage, 0.74x magnification
• 9 point AF with 10 assist points, center dual-cross AF w/2.8 sensor
• 5 frames per second burst, newly developed mirror box
• Intelligent Preview Function
• 3 User programmable custom memory modes on mode dial
• Advanced Dynamic Range Optimizer (5 step selectable)
• 40 segment honeycomb metering
• 3.0" 921K pixel Photo Quality (270 dpi) LCD display, 100% coverage
• Direct HDMI output
• ISO 200-3200 (ISO 100-6400 expanded range)
• User interchangeable focusing screens (3 options)
• CF Type I/II and MS slots, LI-ION battery, STAMINA 880 shots
• Weight 850g (without battery, card, accs)
• New Image Data Converter SR software (includes vignetting control)
• New Vertical Grip
• Supplied with wireless remote control
• Magnesium Alloy body and rubber seals for dust and moisture resistance
• AF micro adjustment
• $2999.99 body price; available late October 2008

Body material	• Magnesium Alloy Chassis and exterior • Environmental seals
Sensor	• 35.9 x 24.0 mm CMOS sensor 'Exmor' • RGB Color Filter Array • Built-in fixed low-pass filter • 25.7 million total pixels • 24.6 million effective pixels • On-chip Column A/D Conversion & NR
Processor	Dual Bionz
Crop Factor	1x
Image sizes (3:2)	• 6048 x 4032 (24M 3:2) • 4400 x 2936 (13M 3:2) • 3024 x 2016 (6.1M 3:2) • 3924 x 2656 (11M APSC) • 2896 x 1928 (5.6M APSC) • 1984 x 1320 (2.6M APSC)
Auto Focus	• TTL CCD line sensors (9-points, center dual cross types + 10 assist sensors)
Custom modes	Three
Bracketing	• Single or continuous bracketing • 3 or 5 frames • 0.3, 0.5 , 0.7 or 2.0 EV steps (2.0 EV steps for 3 exposures only)
Continuous	• H: Approx 5fps max • L: Approx 3fps max • RAW: Up to 12 frames • cRAW (compressed): Up to 25 frames • RAW+JPEG: Up to 10 frames • JPEG (XFINE): Up to 11 frames • JPEG (STD/FINE): 285/105
Viewfinder	• Optical glass pentaprism • Spherical Acute Matte focusing screen (interchangeable) • Frame coverage approx 100% • Magnification approx. 0.74x • Eye-relief 20 mm from eyepiece, 21 mm from frame • Eyepiece shutter
Vertical Grip	Optional vertical Grip VG-C90AM
Dimensions	156 x 117 x 82 mm
Weight	• No battery: 850 g • With battery: 895 g
Other	• Intelligent Preview mode • New raw converter software • AF Micro Adjustment • Top LCD panel

If you're new to digital photography you may wish to read the Digital Photography Glossary before diving into this article (it may help you understand some of the terms used).

Conclusion / Recommendation / Ratings are based on the opinion of the reviewer, you should read the ENTIRE review before coming to your own conclusions.

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