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2010.08.25 16:17

소니 A55 정보

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Sony SLT Alpha A55 In-depth Review,* August 2010
by Barnaby Britton and Lars Rehm

Review based on a production Sony SLT Alpha A55V with firmware version 1.0

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 NEX-3 and NEX-5, 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.

*please note: because we produced this review prior to the official announcement of the Alpha 55, we have been unable to process its .ARW RAW files using our standard Adobe ACR workflow. The various image quality sections of this test are therefore based on the A55's JPEG output, and we will update the review with RAW samples (and full, final numerical scoring) at the earliest possible opportunity.

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
• 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
• 16.2 million total pixels
• 16.7 million effective pixels
• RGB (Primary) color filter array
Continuous shooting
• Continuous Advance Priority AE: max 7fps
• Continuous: 6fps
• Continuous Advance Priority AE: max10fps
• Continuous: 6fps
• 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 frames
Battery life (approx - CIPA)
• EVF: 270 images
• LCD: 340 images
• EVF: 330 images
• LCD: 380 images
Weight (body only)

Foreword / notes

If you're new to digital photography you may wish to read some of our 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 author, we recommend that you read the entire review before making any decision. Images which can be viewed at a larger size have a small magnifying glass icon in the bottom right corner of them, click to display a larger image in a new window.

To navigate this article simply use the next / previous page buttons or jump to a specific page by using the drop-down list in the navigation bar at the top of the page. You can support this site by ordering through the affiliate links shown at the bottom of each page (where available).

This article is protected by Copyright and may not be reproduced in part or as a whole in any electronic or printed medium without prior permission from the author.

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.

Sony A55 stabilized by a Steadicam Merlin from NSF-56k on Vimeo.

가벼운 바디의 10연사의 메리트... 시야율 100%
15개의 측거점 중앙부 3개 크로스 센서.
풀HD 1920 x 1080 59.94i  
영상 촬영중 위상차이 AF
GPS 내장
스위블 액정

  • profile
    최상혁/티베리움 2010.08.25 16:28
    결국 동영상 바디가 나오는군요.. AF속도개선과 영상촬영중 AF기능 10연사는 스위블액정.. 확실히 메리트 있어 보이는 바디입니다만..

    렌즈가격들안습 ㅜㅜ;;;

    3~5년 후에는 분명 소니가 VDSLR 시장을 잡고 있기는 할것 같습니다 핸디캠시리즈에서 만들어놓은 노하우가 슬슬 DSLR에 들어가는군요..

    측거점 위치 뭐 저렇게 만들 이유가 분명 있었겠지만 조금 편성위치가 마음에 안드는건 저뿐만인가요?
  • profile
    서상준 2010.08.26 11:18

    측거점 위치는 좀 거시기해도... -.-
  • profile
    서종모 2010.08.25 16:34
    으아으아으아으아 니콘 뭐하니 ㅋㅋㅋㅋ
  • profile
    서종모 2010.08.26 11:44
    아 이거 진짜 동영상에 수동 노출만 들어갔으면 완전 대박칠 모델인데 ㅠㅠㅠㅠㅠ
  • profile
    최성군/KOON™ 2010.08.26 12:18
    A33이 미러가 반투명 방식이라서 연사나 AF가 유리하다고 하네요.
    (근데, 반투명이면 화질은 괜찮으려나..)
  • ?
    김태환/GEFF 2010.08.26 17:23
    이기술은 캐논에서 프랙시클 미러(?)인가...^^;;;; 해서 예전에 필름 바디시절 1VR버젼인가로 나왔던것 같습니다.
    당시의 이기술로 필름에서 미러의 움직임이 없이 촬영한면서 고속 연사가 가능했던것으로 알고있습니다.
    하지만 미러의 교체문제가 있어서 스포츠 기자 일부분들만 사용을 하고 별로 인기없이 사장이 되었던것으로 알고 있습니다.
    일단 미러 고정이기에 고속 연사및 포커스가 유리한것은 맞구요, 단지 파인더를 통해서 볼때 어두운 현상이 있는것으로 알고 있습니다.
    이부분이 어떻게 개선되었을지는 모를겠습니다.
  • profile
    임동관 2010.08.26 13:48
    고민스럽게 만드네..GH1으로 맘 딱 잡구 있는데...ㅠㅠ
  • profile
    최상혁/티베리움 2010.08.27 18:02
    캐논 제품들 고때 잠깐 나오다가 안나온것으로 알고 있습니다. 김정욱님이 예전에 그 바디 이용했다고 하시더군요..