Canon 600D has a
18.0MP APS-C (22.3 x 14.9 mm ) sized CMOS sensor and features Digic 4 processor. On the other hand, Canon 70D has a
20.0MP APS-C (22.5 x 15 mm ) sized CMOS sensor and features Digic 5+ processor.
Below you can see the 600D and 70D sensor size comparison.
Sensor Size and Resolution Comparison image of Canon 600D and Canon 70D Cameras
Canon 600D and Canon 70D 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 600D and Canon 70D sensors have been tested by DxO and the results show that 70D has a better overall score of 68, 3 points higher compared to 600D's score of 65.
Model
Overall
Color Depth
Dynamic Range
Low-light ISO
Canon 600D
65
22.1 bits
11.5 Evs
793 ISO
Canon 70D
68
22.5 bits
11.6 Evs
926 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 600D
or the
Canon 70D ,
including hyperfocal distance.
