Camera Rocket Review Our evaluation of A77 vs D7100

Image Quality

RAW image quality independent of lens

SLT A77
9.7
D7100
10.0
DxOMark Low light, DxOMark Color depth and DxOMark Dynamic range

Focusing

How fast and easily does the camera nail focus

SLT A77
8.7
D7100
7.9
Focus lag, cross type focus points and focus points

Responsiveness

How much delay is there between you and your photo?

SLT A77
8.9
D7100
8.6
Focus lag, continuous shooting and Startup delay

Reviews

What do the experts think?

SLT A77
9.3
D7100
9.2
Reviews from sonyalpharumors.com, techradar.com, trustedreviews.com, photographyblog.com and 3 more

Camera Rocket Score

Image Quality, Focusing, Responsiveness and Reviews

SLT A77
9.3
D7100
9.2

Winner
Sony SLT A77 

Camera Rocket recommends the Sony SLT A77  based on its focusing, responsiveness and reviews.

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Benchmarks Real world tests of SLT A77 vs D7100

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

SLT A77
801 ISO
D7100
1,256 ISO

Resolution Results from photos of standard resolution charts

SLT A77
2,400 LPH
D7100
3,000 LPH

Focus lag Delay between fully pressing shutter to image capture

SLT A77
124 ms
D7100
251 ms

Shutter lag Delay to take a photo when prefocused

SLT A77
54 ms
D7100
54 ms

Startup delay Delay from power on to first photo

SLT A77
3,100 ms
D7100
300 ms

Continuous shooting Delay between fully pressing shutter to image capture

SLT A77
12 fps
D7100
6 fps

Features Key features of the SLT A77  vs D7100 

Megapixels Maximum resolution images are captured at

SLT A77
24 MP
D7100
24 MP

Max ISO Maximum light sensitivity of the sensor

SLT A77
25,600 ISO
D7100
25,600 ISO

Focus points How many different points the camera can focus on

SLT A77
19
D7100
51

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

SLT A77
3"
D7100
3.2"

Viewfinder size Large viewfinders are brighter and more comfortable to use

SLT A77
0.72x
D7100
0.61x

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

SLT A77
15.3 microns
D7100
15.3 microns

Reviews Word on the street

SLT A77  vs D7100 

10.0
9.0
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

8.2
7.8
While the technology makes for great TVs because of the super blacks, they make every scene look higher-contrast than it is and saturate the colors almost surrealistically.
SLT A77

8.0
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

8.6 Out of 10
8.5 Out of 10

Specifications Full list of technical specs

sensor

SLT A77  vs
D7100 
Type CMOS CMOS
Megapixels 24 MP 24 MP
Resolution 6000 x 4000 6000 x 4000
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 15.3 microns 15.3 microns
Light sensitivity 100 ISO to 16,000 ISO 100 ISO to 6,400 ISO
Light sensitivity (Boost) 50 ISO to 25,600 ISO 6,400 ISO to 25,600 ISO
Codecs
RAW
JPEG
Self cleaning sensor Yes Yes
Tested vertical resolution 2,400 LPH 3,000 LPH
Tested horizontal resolution 2,400 LPH 3,000 LPH

focus system

Type Phase detection Phase detection
Focus points 19 51
Cross type focus points 11 15
Supports continuous No Yes

shutter

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

form factor

Size 143 x 104 x 81 mm 136 x 107 x 76 mm
Thickness 81 mm 76 mm
Weight 732 g 675 g
Is weather sealed Yes Yes

features

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

video

SLT A77  vs
D7100 
Video 1920 x 1080 @ 60 fps 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 Contrast detection
Autofocus type Phase detection Contrast detection
Autofocus supports continuous Yes Yes

display

Type LCD LCD
Size 3" 3.2"
Resolution 921 k dots 1,229 k dots
Has a touch screen No No
Has a flip out screen Yes No
Supports live view Yes Yes

viewfinder

Viewfinder mirror Translucent Opaque
Viewfinder Yes Yes
Type Electronic Pentaprism
Coverage 100% 100%
Magnification 1.1x 0.94x
Viewfinder size 0.72x 0.61x

performance

Max continuous shooting 12 fps 6 fps
Battery life 530 950
Continuous shooting
12 fps, JPEG
6 fps
Focus lag 124 ms 251 ms
Shutter lag 54 ms 54 ms
Startup delay 3,100 ms 300 ms
Sony SLT A77
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Nikon D7100
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