General

compared to recent entry-level DSLRs
"The Sony Alpha SLT A55 is completely new designs which offer several key advantages over 'traditional' DSLR technology."
dpreview.com | talking about the camera's overall-performance
Brand
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Sony
Lowest price
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$668.03
below average below average
Announced
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August 2010
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Sensor

"Image quality gives little cause for complaint, with reliable exposure, color, white balance and focus reliable enough that you can concentrate on the important stuff, like framing and actually taking the picture."
dpreview.com | talking about the camera's image-quality
Type
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CMOS
Crop factor
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1.5x
Megapixels
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16 MP
below average below average
Light sensitivity
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12,800 ISO
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Light sensitivity (boost)
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25,600 ISO
Sensor cleaning
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Yes

Sensor (Advanced)

compared to recent entry-level DSLRs
True resolution
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16 MP
below average below average
Native resolution
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4912 × 3264
below average below average
Pixel size
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22.9 µm²
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Screen

Type
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LCD
Size
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3"
below average below average
Resolution
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921k dots
below average below average
Touch screen
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No
below average below average
Flips out
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Yes
above average above average
Live view
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Yes

Lenses

compared to recent entry-level DSLRs
Lens availability
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126 lenses
below average below average
Lens mount
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Sony Alpha

Form factor

"The A55 isn't quite as loaded with buttons and switches as other Sony Alpha cameras... but it should have enough physical control points to satisfy anyone except the most menu-allergic of users."
dpreview.com | talking about the camera's button-layout
Size
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124×92×85 mm
below average below average
Depth
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3.3"
below average below average
Weight
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500 g
Interchangeable lenses
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Yes
Waterproof
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No
Weather sealed
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No
below average below average
Built-in focus motor
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No
below average below average

Viewfinder

compared to recent entry-level DSLRs
Type
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Digital
below average below average
Viewfinder size
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0.72x
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Coverage
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Unknown

Movies

"The A55's video mode delivers good quality output that is far better than anything you'd get from a digital compact camera."
dpreview.com | talking about the camera's video-quality
Format
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1080p @ 30fps
below average below average
Supports 24p
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No
below average below average
High-speed framerate
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None
External mic jack
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Yes
above average above average
Autofocus
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Phase detection
Continuous focus
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Yes
unique unique
All formats
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  1. 480p @ 30fps
  2. 1,440 x 1,080 @ 30fps
  3. 1080p @ 30fps

Features

compared to recent entry-level DSLRs
"The A55 features Sony's established Super SteadyShot INSIDE image stabilization system to reduce the effect of camera shake. Sony claims a benefit of between 2.5 and 4 stops in useable shutter speed."
dpreview.com | talking about the camera's image-stabilization
Panorama
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Yes
HDR
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Yes
3D
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Yes
Image stabilization
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  1. Sensor shift
Supports RAW
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Yes
GPS
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Yes
above average above average

Performance

Startup delay
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900 ms
below average below average
Shutter lag
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220 ms
below average below average
Battery life
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330 shots
below average below average
Continuous shooting
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10 fps
unique unique

Focus system

compared to recent entry-level DSLRs
Autofocus
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Phase detection
above average above average
Focus points
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15
below average below average
Cross type focus points
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3

Shutter

Max
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1/4000s
below average below average
Min
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30s

Flash

compared to recent entry-level DSLRs
Built-in flash
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Yes
Popup
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Yes
above average above average
External connection
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Yes

Storage

Storage slots
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1
Supported formats
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  1. Memory Stick
  2. Memory Stick Duo
  3. Memory Stick PRO Duo
  4. SD
  5. SDHC
  6. SDXC

DXO Mark Scores

compared to recent entry-level DSLRs
"Little control over high ISO noise reduction"
dpreview.com | talking about the camera's iso-noise
Image quality
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73.0
Color depth
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23 bits
Dynamic range
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12.4 EV
Low light performance
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816 ISO