Camera Rocket Review Our evaluation of A57 vs A55

Image Quality

RAW image quality independent of lens

SLT A57
9.6
SLT A55
9.7
DxOMark Low light, DxOMark Color depth and DxOMark Dynamic range

Focusing

How fast and easily does the camera nail focus

SLT A57
6.2
SLT A55
6.2
cross type focus points and focus points

Responsiveness

How much delay is there between you and your photo?

SLT A57
10.0
SLT A55
10.0
continuous shooting

Reviews

What do the experts think?

SLT A57
9.4
SLT A55
8.9
Reviews from sonyalpharumors.com, techradar.com, photographyblog.com and 1 more

No winner declared

Too close to call

Benchmarks Real world tests of SLT A57 vs A55

Low light image quality Highest ISO setting that still achieves great image quality

SLT A57
785 ISO
SLT A55
816 ISO

Resolution Results from photos of standard resolution charts

SLT A57
2,400 LPH
SLT A55
2,600 LPH

Continuous shooting Delay between fully pressing shutter to image capture

SLT A57
12 fps
SLT A55
10 fps

Battery life How many photos per battery charge (CIPA)

SLT A57
550 photos
SLT A55
330 photos

Color depth The number of variations of color the camera can capture

SLT A57
23.4 bits
SLT A55
23.0 bits

Dynamic range Maximum range a camera can capture in one image from light to dark

SLT A57
13.0 ev
SLT A55
12.4 ev

Features Key features of the SLT A57  vs A55 

Megapixels Maximum resolution images are captured at

SLT A57
16 MP
SLT A55
16 MP

Max ISO Maximum light sensitivity of the sensor

SLT A57
25,600 ISO
SLT A55
25,600 ISO

Focus points How many different points the camera can focus on

Screen size Larger screens make it easier to preview and review photos

Viewfinder size Large viewfinders are brighter and more comfortable to use

SLT A57
0.72x
SLT A55
0.72x

Pixel size How much area of the sensor is dedicated to each pixel

SLT A57
22.9 microns
SLT A55
22.9 microns

Reviews Word on the street

SLT A57  vs A55 

9.0
9.0
As with Live View, continuous phase-detection AF is possible whilst shooting movies on the A57, a distinct advantage over most DSLR cameras and fast enough to rival Compact System Cameras like the Panasonic Lumix GH series.
SLT A57

8.0
6.0
The fact that the screen is articulated adds another level of versatility to this camera's design, helping users to maximise the benefits of the Sony Alpha a57's excellent Live View system as well as its movie mode, particularly when you need to shoot subjects from awkward perspectives.
SLT A57

Overall

8.8 Out of 10
7.9 Out of 10

Specifications Full list of technical specs

sensor

SLT A57  vs
A55 
Type CMOS CMOS
Megapixels 16 MP 16 MP
Resolution 4912 x 3264 4912 x 3264
Size APS-C APS-C
Area 23.5 x 15.6 mm 23.5 x 15.6 mm
Crop factor 1.5x 1.5x
Pixel size 22.9 microns 22.9 microns
Light sensitivity 100 ISO to 16,000 ISO 100 ISO to 12,800 ISO
Light sensitivity (Boost) 16,000 ISO to 25,600 ISO 12,800 ISO to 25,600 ISO
Codecs
RAW
JPEG
Self cleaning sensor Yes Yes
Tested vertical resolution 2,400 LPH 2,600 LPH
Tested horizontal resolution 2,400 LPH 2,600 LPH

focus system

Type Phase detection Phase detection
Focus points 15 15
Cross type focus points 3 3
Supports continuous Yes No

shutter

Min 30 s 30 s
Max 1/4000 s 1/4000 s

form factor

Size 132 x 98 x 81 mm 124 x 92 x 85 mm
Thickness 81 mm 85 mm
Weight 618 g 500 g
Is weather sealed No No

video

SLT A57  vs
A55 
Video 1920 x 1080 @ 60 fps 1920 x 1080 @ 30 fps
Shoots video in 24p Yes No
Shoots high speed video No No
External mic jack 3.5mm 3.5mm
Autofocus while shooting video Phase detection Phase detection
Autofocus type Phase detection Phase detection

display

Type LCD LCD
Size 3" 3"
Resolution 921 k dots 921 k dots
Has a touch screen No No
Has a flip out screen Yes Yes
Supports live view Yes Yes

viewfinder

Viewfinder mirror Translucent Translucent
Viewfinder Yes Yes
Type Electronic Electronic
Magnification 1.1x 1.1x
Viewfinder size 0.72x 0.72x

performance

Max continuous shooting 12 fps 10 fps
Battery life 550 330
Continuous shooting
12 fps, JPEG
10 fps, JPEG

features

Includes a GPS No Yes
Supports HDR Yes Yes
Automatic panorama Yes Yes
Create realistic 3D images Yes Yes
Image stabilization
Sensor shift
Sony SLT A57
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Sony SLT A55
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