Canon 30D has a
8.0MP APS-C (22.5 x 15 mm ) sized CMOS sensor . On the other hand, Canon 400D has a
10.0MP APS-C (22.2 x 14.8 mm ) sized CMOS sensor .
Below you can see the 30D and 400D sensor size comparison.
Sensor Size and Resolution Comparison image of Canon 30D and Canon 400D Cameras
Canon 30D and Canon 400D have almost the same sensor size, so neither of them has any significant advantage over the other in terms of providing control over depth of field when used with the same focal length and aperture.
DxOMark Sensor Scores
DxOMark is a benchmark that scientifically assesses image quality of camera sensors. It scores camera sensors for color depth (DXO Portrait), dynamic range (DXO Landscape) and low-light sensitivity (DXO Sports), and also gives them an overall score. Canon 30D and Canon 400D sensors have been tested by DxO and the results show that 400D has a better overall score of 62, 3 points higher compared to 30D's score of 59.
Model
Overall
Color Depth
Dynamic Range
Low-light ISO
Canon 30D
59
21.5 bits
10.8 Evs
736 ISO
Canon 400D
62
22.1 bits
11.0 Evs
664 ISO
Sensor size sets the circle of confusion, so it drives how much depth of field each
of these bodies gives you at a given aperture. You can calculate it exactly for the
Canon 30D
or the
Canon 400D ,
including hyperfocal distance.
