Camera Rocket Review Our evaluation of T3i vs 400D

Image Quality

RAW image quality independent of lens

DxOMark Low light, DxOMark Color depth and DxOMark Dynamic range


How fast and easily does the camera nail focus

Focus lag and focus points


How much delay is there between you and your photo?

Focus lag, continuous shooting and Startup delay


What do the experts think?

Reviews from,,, and 3 more

No winner declared

Too close to call

Benchmarks Real world tests of Rebel T3i vs EOS 400D

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

Rebel T3i
793 ISO
EOS 400D
664 ISO

Focus lag Delay between fully pressing shutter to image capture

Rebel T3i
283 ms
EOS 400D
200 ms

Shutter lag Delay to take a photo when prefocused

Rebel T3i
87 ms
EOS 400D
105 ms

Startup delay Delay from power on to first photo

Rebel T3i
1,500 ms
EOS 400D
2,500 ms

Continuous shooting Delay between fully pressing shutter to image capture

Rebel T3i
3.7 fps
EOS 400D
3 fps

Battery life How many photos per battery charge (CIPA)

Rebel T3i
440 photos
EOS 400D
370 photos

Features Key features of the Rebel T3i  vs EOS 400D 

Megapixels Maximum resolution images are captured at

Rebel T3i
17.9 MP
EOS 400D
10.1 MP

Max ISO Maximum light sensitivity of the sensor

Rebel T3i
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

Viewfinder size Large viewfinders are brighter and more comfortable to use

Rebel T3i
EOS 400D

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

Rebel T3i
18.5 microns
EOS 400D
32.6 microns

Reviews Word on the street

Rebel T3i  vs EOS 400D 

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

Ironically, this design is more suited to pros who plan to use the camera as a cheap video dSLR and never take it off the video setting than to the consumers at whom it's ostensibly targeted.
Rebel T3i

In terms of looks, build and sheer usability, this tiny powerhouse of a camera borrows heavily from its acclaimed forerunner, the hugely successful and very likeable eightmegapixel 350D.
EOS 400D


8.3 Out of 10
8.8 Out of 10

Specifications Full list of technical specs


Rebel T3i  vs
EOS 400D 
Megapixels 17.9 MP 10.1 MP
Resolution 5184 x 3456 3888 x 2592
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
Self cleaning sensor Yes Yes

focus system

Type Phase detection Contrast detection
Focus points 9 9


Viewfinder mirror Opaque Opaque
Viewfinder Yes Yes
Type Pentamirror Pentamirror
Coverage 95% 95%
Magnification 0.85x 0.8x
Viewfinder size 0.53x 0.49x


Max continuous shooting 3.7 fps 3 fps
Battery life 440 370
Continuous shooting
3.7 fps, JPEG
3 fps, JPEG
Focus lag 283 ms 200 ms
Shutter lag 87 ms 105 ms
Startup delay 1,500 ms 2,500 ms


Rebel T3i  vs
EOS 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


Size 3" 2.5"
Resolution 1,040 k dots 230 k dots
Has a touch screen No No
Has a flip out screen Yes No
Supports live view Yes No


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

form factor

Size 133.1 x 99.5 x 79.7 mm 127 x 94 x 65 mm
Thickness 79.7 mm 65 mm
Weight 570 g 556 g
Is weather sealed No No


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 Rebel T3i
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Canon EOS 400D
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