Camera Rocket Review Our evaluation of A99 vs A57

Image Quality

RAW image quality independent of lens

SLT A99
9.9
SLT A57
8.8
DxOMark Low light, DxOMark Color depth and DxOMark Dynamic range

Focusing

How fast and easily does the camera nail focus

SLT A99
7.4
SLT A57
5.9
cross type focus points and focus points

Responsiveness

How much delay is there between you and your photo?

SLT A99
10.0
SLT A57
10.0
continuous shooting

Reviews

What do the experts think?

SLT A99
9.2
SLT A57
9.4
Reviews from sonyalpharumors.com, imaging-resource.com, techradar.com and 5 more

No winner declared

Too close to call

Benchmarks Real world tests of SLT A99 vs A57

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

SLT A99
1,555 ISO
SLT A57
785 ISO

Resolution Results from photos of standard resolution charts

SLT A99
2,900 LPH
SLT A57
2,400 LPH

Continuous shooting Delay between fully pressing shutter to image capture

SLT A99
6 fps
SLT A57
12 fps

Battery life How many photos per battery charge (CIPA)

SLT A99
500 photos
SLT A57
550 photos

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

SLT A99
25.0 bits
SLT A57
23.4 bits

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

SLT A99
14.0 ev
SLT A57
13.0 ev

Features Key features of the SLT A99  vs A57 

Megapixels Maximum resolution images are captured at

SLT A99
24 MP
SLT A57
16 MP

Max ISO Maximum light sensitivity of the sensor

SLT A99
25,600 ISO
SLT A57
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 A99
0.71x
SLT A57
0.72x

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

SLT A99
35.8 microns
SLT A57
22.9 microns

Reviews Word on the street

SLT A99  vs A57 

9.0
9.0
As with Live View, continuous phase-detection AF is possible whilst shooting movies on the A99, a distinct advantage over most DSLR cameras and fast enough to rival Compact System Cameras like the Panasonic Lumix GH series.
SLT A99

7.0
8.0
The versatile swivelling LCD screen encourages creativity when it comes to framing stills and videos, the EVF is great and image quality is very pleasing - particularly when it comes to noise control.
SLT A57

Overall

8.4 Out of 10
8.8 Out of 10

Specifications Full list of technical specs

sensor

SLT A99  vs
A57 
Type EXMOR CMOS
Megapixels 24 MP 16 MP
Resolution 6000 x 4000 4912 x 3264
Size Full frame APS-C
Area 35.8 x 24 mm 23.5 x 15.6 mm
Crop factor 1.0x 1.5x
Pixel size 35.8 microns 22.9 microns
Light sensitivity 100 ISO to 25,600 ISO 100 ISO to 16,000 ISO
Codecs
RAW
JPEG
Self cleaning sensor Yes Yes
Tested vertical resolution 2,900 LPH 2,400 LPH
Tested horizontal resolution 2,900 LPH 2,400 LPH

focus system

Type Phase detection Phase detection
Focus points 19 15
Cross type focus points 11 3
Supports continuous Yes Yes

shutter

Min 30 s 30 s
Max 1/8000 s 1/4000 s

form factor

Size 147 x 111 x 78 mm 132 x 98 x 81 mm
Thickness 78 mm 81 mm
Weight 812 g 618 g
Is weather sealed Yes No

features

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

video

SLT A99  vs
A57 
Video 1920 x 1080 @ 60 fps (17 Mbps, AVCHD, MPEG-4) 1920 x 1080 @ 60 fps
Shoots video in 24p Yes Yes
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
Autofocus supports continuous Yes Yes

display

Type LCD LCD
Size 3" 3"
Resolution 1,229 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
Coverage 100% 100%
Magnification 0.71x 1.1x
Viewfinder size 0.71x 0.72x
Display type OLED LCD

performance

Max continuous shooting 6 fps 12 fps
Battery life 500 550
Continuous shooting
12 fps, JPEG
10 fps, JPEG
6 fps
Sony SLT A99
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Sony SLT A57
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