Sony Alpha 55
|Type||Digital single-lens translucent camera|
|Sensor||APS-C CMOS Sensor|
|Maximum resolution||16.2 megapixels|
|Film speed||ISO equivalency 100 to 12,800 in 1.0 EV steps, boost to 25,600 in Multi-Frame Noise Reduction mode|
|Storage media||SD/SDHC/SDXC/Memory Stick Pro Duo|
|Focus modes||Single-shot AF, Automatic AF, Continuous AF, Manual Focus|
|Focus areas||15-point (12 line, 3 cross) phase-detection AF system|
|Exposure modes||Programmed AE (AUTO, AUTO – Flash Off, P), Aperture priority, Shutter priority, Manual, Scene selection|
|Exposure metering||TTL full aperture exposure metering system|
|Metering modes||Multi-segment, Centre-weighted, Spot|
|Flash||GN 10 at ISO 100|
|Shutter||Electronically controlled, Vertical-traverse, Focal-plane Shutter|
|Shutter speed range||30 – 1/4000 sec, bulb|
|Continuous shooting||10 FPS / 6 FPS|
|Viewfinder||EVF, 100% coverage, 1.10× magnification|
|White balance||Auto / 6 presets / Colour Temperature/Colour Filter / Custom WB|
|LCD screen||3.0" TFT LCD, 921k dot resolution, variable-angle tilt/swivel|
|Battery||NP-FW50 Lithium-ion battery rechargeable battery|
|Optional battery packs||Unavailable|
|Dimensions||124 × 92 × 85 mm|
|Weight||441 g (15.6 oz)|
The Sony α55 (model variants SLT-A55V with GPS, SLT-A55 without GPS depending on country) is a midrange-level SLT camera, released in August 2010.
Its design is novel due to its being the first digital single-lens translucent camera (SLT), along with the Sony α33. As an SLT it employs a semi-transparent mirror instead of an opaque mirror, which enables phase detection autofocus in live view.
The design also replaces the optical viewfinder present in conventional DSLR with a high-resolution electronic viewfinder. The translucent mirror is fixed in position so does not have to flip up to take a still image, enabling rapid continuous shots of up to 10 frames per second. The static mirror also eliminates "mirror slap", the noise produced by the movement of the mirror during a shutter actuation, making the A55 quieter than standard DSLRs.
The A55 is one of the first four Sony Alpha DSLR / SLT cameras with video mode included, capable of 1080i. It is also capable of shooting 1080p at 30fps. The SLT design means that it is capable of using phase-detection autofocus during video recording. It has body-integrated image stabilization, and a 16.2 MPx APS-C CMOS sensor.
The camera's body-integrated image stabilization produces heat, causing the camera to stop video recording after these recording times:
|Model name||Ambient temperature||Image Stabilization|
|α55 (SLT-A55V)||20 °C (68 °F)||9 min||Approx. 29 minutes|
|30 °C (86 °F)||6 min||13 minutes|
|40 °C (104 °F)||3 min||5 minutes|
|α33 (SLT-A33)||20 °C (68 °F)||11 min||Approx. 29 minutes|
|30 °C (86 °F)||7 min||Approx. 22 minutes|
|40 °C (104 °F)||4 min||9 minutes|
- Konica Minolta A-mount lens bayonet.
- AVCHD 1080 50i or 60i (depending on region)
- MPEG-4 1080 30p or 25p (depending on region)
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