Camera Rocket Review Our evaluation of 550D vs 400D

Image Quality

RAW image quality independent of lens

EOS 550D
9.5
EOS 400D
9.2
DxOMark Low light, DxOMark Color depth and DxOMark Dynamic range

Focusing

How fast and easily does the camera nail focus

EOS 550D
7.0
EOS 400D
7.5
Focus lag and focus points

Responsiveness

How much delay is there between you and your photo?

EOS 550D
8.4
EOS 400D
8.2
Focus lag, continuous shooting and Startup delay

Reviews

What do the experts think?

EOS 550D
9.2
EOS 400D
9.4
Reviews from techradar.com, 1001noisycameras.com, trustedreviews.com and 4 more

No winner declared

Too close to call

Benchmarks Real world tests of EOS 550D vs 400D

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

EOS 550D
784 ISO
EOS 400D
664 ISO

Focus lag Delay between fully pressing shutter to image capture

EOS 550D
252 ms
EOS 400D
200 ms

Shutter lag Delay to take a photo when prefocused

EOS 550D
96 ms
EOS 400D
105 ms

Startup delay Delay from power on to first photo

EOS 550D
400 ms
EOS 400D
2,500 ms

Continuous shooting Delay between fully pressing shutter to image capture

EOS 550D
3.7 fps
EOS 400D
3 fps

Battery life How many photos per battery charge (CIPA)

EOS 550D
440 photos
EOS 400D
370 photos

Features Key features of the EOS 550D  vs 400D 

Megapixels Maximum resolution images are captured at

EOS 550D
17.9 MP
EOS 400D
10.1 MP

Max ISO Maximum light sensitivity of the sensor

EOS 550D
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

EOS 400D
2.5"

Viewfinder size Large viewfinders are brighter and more comfortable to use

EOS 550D
0.54x
EOS 400D
0.49x

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

EOS 550D
18.5 microns
EOS 400D
32.6 microns

Reviews Word on the street

EOS 550D  vs 400D 

8.0
9.0
1/30th sec, F5.6, ISO 100 At 100 ISO the picture is clean, well detailed and noise free, everything we've come to expect from a Canon DSLR.
EOS 400D

7.8
7.8
The camera also delivers the best video capture quality I've seen in a sub-$1,000 dSLR-subject to the inescapable limitations the technology, like unusable autofocus-with good exposure, sharpness, minimal artifacts, and excellent audio.
EOS 550D

9.0
9.0
While the EOS 550D can shoot at 3.7 frames per second in Continuous Shooting Mode, it's restricted to 34 JPEG images, or six RAW files – so sports and action photographers might want to look elsewhere.
EOS 550D

Overall

8.4 Out of 10
8.8 Out of 10

Specifications Full list of technical specs

sensor

EOS 550D  vs
400D 
Type CMOS CMOS
Megapixels 17.9 MP 10.1 MP
Resolution 5184 x 3456 3888 x 2592
Size APS-C APS-C
Area 22.3 x 14.9 mm 22.2 x 14.8 mm
Crop factor 1.6x 1.6x
Pixel size 18.5 microns 32.6 microns
Light sensitivity 100 ISO to 6,400 ISO 100 ISO to 1,600 ISO
Codecs
RAW
JPEG
Self cleaning sensor Yes Yes

focus system

Type Phase detection Contrast detection
Focus points 9 9

viewfinder

Viewfinder mirror Opaque Opaque
Viewfinder Yes Yes
Type Pentamirror Pentamirror
Coverage 95% 95%
Magnification 0.87x 0.8x
Viewfinder size 0.54x 0.49x

performance

Max continuous shooting 3.7 fps 3 fps
Battery life 440 370
Continuous shooting
3.7 fps, JPEG
3 fps, JPEG
Focus lag 252 ms 200 ms
Shutter lag 96 ms 105 ms
Startup delay 400 ms 2,500 ms

video

EOS 550D  vs
400D 
Video 1920 x 1080 @ 30 fps None
Shoots video in 24p Yes N/A
Shoots high speed video No N/A
External mic jack 3.5mm N/A
Autofocus while shooting video Manual N/A
Autofocus type N/A N/A
Autofocus supports continuous N/A N/A

display

Type LCD LCD
Size 3" 2.5"
Resolution 1,040 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 129 x 98 x 62 mm 127 x 94 x 65 mm
Thickness 62 mm 65 mm
Weight 530 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
Canon EOS 550D
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Canon EOS 400D
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