Camera Rocket Review Our evaluation of A99 vs A77

Image Quality

RAW image quality independent of lens

SLT A99
10.0
SLT A77
9.6
DxOMark Low light, DxOMark Color depth and DxOMark Dynamic range

Focusing

How fast and easily does the camera nail focus

SLT A99
6.6
SLT A77
6.6
focus points

Responsiveness

How much delay is there between you and your photo?

SLT A99
10.0
SLT A77
10.0
continuous shooting

Reviews

What do the experts think?

SLT A99
9.2
SLT A77
9.3
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 A77

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

SLT A99
1,555 ISO
SLT A77
801 ISO

Resolution Results from photos of standard resolution charts

SLT A99
2,900 LPH
SLT A77
2,400 LPH

Focus lag Delay between fully pressing shutter to image capture

SLT A99
127 ms
SLT A77
124 ms

Startup delay Delay from power on to first photo

SLT A99
700 ms
SLT A77
3,100 ms

Continuous shooting Delay between fully pressing shutter to image capture

SLT A99
6 fps
SLT A77
12 fps

Battery life How many photos per battery charge (CIPA)

SLT A99
500 photos
SLT A77
530 photos

Features Key features of the SLT A99  vs A77 

Megapixels Maximum resolution images are captured at

SLT A99
24 MP
SLT A77
24 MP

Max ISO Maximum light sensitivity of the sensor

SLT A99
25,600 ISO
SLT A77
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 A77
0.72x

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

SLT A99
35.8 microns
SLT A77
15.3 microns

Reviews Word on the street

SLT A99  vs A77 

9.0
10.0
The continuous shooting speed of 12fps at full resolution when using the EVF or in Live View mode is amazing for a prosumer camera, especially one with so many megapixels, while Sony's long-standing D-Range Optimizer and HDR functions help to even out tricky exposures, for example where a bright background would normally throw the foreground into deep shadow.
SLT A77

8.3
8.2
In addition to the complete set of essential features for a pro camera, the A99V has a couple of unique features for this class, including built-in GPS (which strains the already lackluster battery life a bit), in-camera image stabilization (both Canon and Nikon use lens-based IS), and a built-in stereo microphone (which is nice to have in a pinch).
SLT A99

7.0
8.0
That said, when weighing these up against a superb level of image quality when shooting in most conditions, great handling, good build quality, industry-leading EVF, quick full-time phase detection AF system and a comprehensive set of exposure modes, we have little trouble with recommending this excellent camera.
SLT A77

Overall

8.4 Out of 10
8.6 Out of 10

Specifications Full list of technical specs

sensor

SLT A99  vs
A77 
Type EXMOR CMOS
Megapixels 24 MP 24 MP
Resolution 6000 x 4000 6000 x 4000
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 15.3 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 19
Cross type focus points 11 11
Supports continuous Yes No

shutter

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

form factor

Size 147 x 111 x 78 mm 143 x 104 x 81 mm
Thickness 78 mm 81 mm
Weight 812 g 732 g
Is weather sealed Yes Yes

features

Includes a GPS Yes Yes
Supports HDR Yes Yes
WiFi None None
Automatic panorama Yes Yes
Create realistic 3D images No Yes
Image stabilization
Sensor shift

video

SLT A99  vs
A77 
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 OLED
Display resolution 2,360 k dots 2,400 k dots

performance

Max continuous shooting 6 fps 12 fps
Battery life 500 530
Continuous shooting
12 fps, JPEG
6 fps
Focus lag 127 ms 124 ms
Startup delay 700 ms 3,100 ms
Sony SLT A99
Report a correction
Sony SLT A77
Report a correction

Comments

comments powered by Disqus