Camera Rocket Review Our evaluation of D3100 vs 400D

Image Quality

RAW image quality independent of lens

D3100
9.9
EOS 400D
9.2
DxOMark Low light, DxOMark Color depth and DxOMark Dynamic range

Focusing

How fast and easily does the camera nail focus

D3100
6.9
EOS 400D
7.5
Focus lag and focus points

Responsiveness

How much delay is there between you and your photo?

D3100
8.3
EOS 400D
8.2
Focus lag, continuous shooting and Startup delay

Reviews

What do the experts think?

D3100
9.2
EOS 400D
9.4
Reviews from nikonrumors.com, techradar.com, trustedreviews.com, sonyalpharumors.com and 5 more

Camera Rocket Score

Image Quality, Focusing, Responsiveness and Reviews

D3100
9.1
EOS 400D
9.0

Winner
Nikon D3100 

Camera Rocket recommends the Nikon D3100  based on its image quality and responsiveness.

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Benchmarks Real world tests of D3100 vs EOS 400D

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

D3100
919 ISO
EOS 400D
664 ISO

Focus lag Delay between fully pressing shutter to image capture

D3100
279 ms
EOS 400D
200 ms

Shutter lag Delay to take a photo when prefocused

D3100
117 ms
EOS 400D
105 ms

Startup delay Delay from power on to first photo

D3100
400 ms
EOS 400D
2,500 ms

Continuous shooting Delay between fully pressing shutter to image capture

D3100
3 fps
EOS 400D
3 fps

Battery life How many photos per battery charge (CIPA)

D3100
550 photos
EOS 400D
370 photos

Features Key features of the D3100  vs EOS 400D 

Megapixels Maximum resolution images are captured at

D3100
14.2 MP
EOS 400D
10.1 MP

Max ISO Maximum light sensitivity of the sensor

D3100
12,800 ISO
EOS 400D
1,600 ISO

Focus points How many different points the camera can focus on

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

D3100
3"
EOS 400D
2.5"

Viewfinder size Large viewfinders are brighter and more comfortable to use

D3100
0.51x
EOS 400D
0.49x

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

D3100
25.1 microns
EOS 400D
32.6 microns

Reviews Word on the street

D3100  vs EOS 400D 

9.0
9.0
Again some visible pixel fringing because of pointing the lens skyward and the contrast between light and dark, but that's not what draws the eye.
D3100

7.4
7.8
The LCD display grew from 1.8 to 2.5 inches, which essentially squeezed the status/info LCD into the ether.
EOS 400D

9.0
9.0
Even so, the LCD looks fairly accurate in terms of brightness, contrast and colour balance, and that's what is most important.
D3100

Overall

8.5 Out of 10
8.8 Out of 10

Specifications Full list of technical specs

sensor

D3100  vs
EOS 400D 
Type CMOS CMOS
Megapixels 14.2 MP 10.1 MP
Resolution 4608 x 3072 3888 x 2592
Size APS-C APS-C
Area 23.1 x 15.4 mm 22.2 x 14.8 mm
Crop factor 1.6x 1.6x
Pixel size 25.1 microns 32.6 microns
Light sensitivity 100 ISO to 3,200 ISO 100 ISO to 1,600 ISO
Codecs
RAW
JPEG
Self cleaning sensor Yes Yes

focus system

Type Phase detection Contrast detection
Focus points 11 9

viewfinder

Viewfinder mirror Opaque Opaque
Viewfinder Yes Yes
Type Pentamirror Pentamirror
Coverage 95% 95%
Magnification 0.8x 0.8x
Viewfinder size 0.51x 0.49x

performance

Max continuous shooting 3 fps 3 fps
Battery life 550 370
Continuous shooting
3 fps, JPEG
Focus lag 279 ms 200 ms
Shutter lag 117 ms 105 ms
Startup delay 400 ms 2,500 ms

video

D3100  vs
EOS 400D 
Video 1920 x 1080 @ 24 fps None
Shoots video in 24p Yes N/A
Shoots high speed video No N/A
External mic jack None N/A
Autofocus while shooting video Contrast detection N/A
Autofocus type Contrast detection N/A

display

Type LCD LCD
Size 3" 2.5"
Resolution 230 k dots 230 k dots
Has a touch screen No No
Has a flip out screen No No
Supports live view Yes No

shutter

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

form factor

Size 124.5 x 96.5 x 73.7 mm 127 x 94 x 65 mm
Thickness 73.7 mm 65 mm
Weight 505 g 556 g
Is weather sealed No No

features

Is a smart camera No No
Includes a GPS No No
Supports HDR No No
Automatic panorama No No
Create realistic 3D images No No
Image stabilization
Nikon D3100
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Canon EOS 400D
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