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Sony SLT Alpha A55 In-depth Review
August 2010 | Barnaby Britton and Lars Rehm
Sony's latest interchangeable lens cameras, the SLT Alpha A33 and A55 represent a significant technological milestone - not just for Sony but for the enthusiast camera market as a whole.
The company has rejected the traditional DSLR design and instead created a hybrid that, like a compact camera, is from the ground up built around live view, but one that is also capable of offering full-time DSLR-style phase-detection autofocus. The combination means they can offer features such as phase-detection AF during movie recording and extremely fast continuous shooting rates (10 frames per second on the A55), previously unthinkable at this price.
This is made possible by adopting an approach that has more in common with a mirrorless camera (like the Panasonic G2, for example) than an SLR by removing the bits that pretty much define such cameras: the optical viewfinder and moving mirror.
The designation 'SLT' stands for single lens translucent and it's the 'translucent' bit that's the key to what differentiates these new models both from conventional DSLRs and mirrorless interchangeable lens cameras. The SLTs do have mirrors, but they're mirrors that let the majority of the light pass straight through to the sensor, rather than having to swing out of the way to allow exposure. As a result they are fixed in position, always reflecting a portion of the light emerging from the back of the lens onto a phase-detection AF array housed in the top of the camera. (A newly-developed 15-point array in the case of these two cameras).
The A33 features the same 14 million APS HD CMOS sensor as the http://www.dpreview.com/reviews/SonyNex5Nex3/, but the sensor in the A55 is brand new, with 16.2 million effective pixels - Sony's highest-resolution APS-C format sensor yet. In another first for Sony's large-body interchangeable lens models, both cameras can shoot movie files as well, at 1080p HD resolution. Technically this review was conducted with a SLT A55V: the GPS-enabled variant of the camera that will be sold in most markets - only in a handful of countries (notably Japan), will a non-GPS version of the A55 be sold.
Sony A55 - key specifications
16.2MP (effective) APS HD CMOS sensor
Fixed, pellicle-type semi-translucent mirror
Maximum ISO 12,800 (with a quasi-ISO 25,600 'Multi-frame NR' option)
15-point phase-detection AF array with 3 cross-type AF points
Electronic viewfinder with 1.15 million dot resolution
Built-in GPS
Electronic level in EVF/LCD with pitch/roll indicator
Dual-purpose Memory Stick/SD card slot
10fps continuous shooting rate
1080p AVCHD movie mode with continuous AF
Articulated 3in 'TruBlack' LCD with 912k dots
socket for external microphone
2x magnification mode in live view
Face-detection AF (focus via nearest phase-detection AF point)
Sony A33 and A55 - differences
Sony Alpha A33
Sony Alpha A55
Sensor• APS-C 'Exmor' APS HD CMOS sensor
• 14.6 million total pixels
• 14.2 million effective pixels
• RGB (Primary) color filter array
•APS-C 'Exmor' APS HD CMOS sensor
• 16.7 million total pixels
• 16.2 million effective pixels
• RGB (Primary) color filter arrayContinuous shooting• Continuous Advance Priority AE: max 7fps
• Continuous: 6fps
• Continuous Advance Priority AE: max10fps
• Continuous: 6fpsGPSN/A
• Built-in - records orientation and elevation data.Buffer in continuous shooting• JPEG Fine: 16 frames
• JPEG Standard: 20 frames
• RAW: 7 frames
• RAW + JPEG: 7 frames
• JPEG Fine: 35 frames
• JPEG Standard: 39 frames
• RAW: 20 frames
• RAW + JPEG: 20 framesBattery life (approx - CIPA)• EVF: 270 images
• LCD: 340 images
• EVF: 330 images
• LCD: 380 imagesWeight (body only)433g
441g
Foreword / notes
If you're new to digital photography you may wish to read some of our http://dpreview.com/learn/?/glossary/ before diving into this article (it may help you understand some of the terms used).
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Dpreview use calibrated monitors at the PC normal gamma 2.2, this means that on our monitors we can make out the difference between all of the grayscale blocks below. We recommend to make the most of this review you should be able to see the difference (at least) between X,Y and Z and ideally also A, B and C.
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