Canon 650D has a
18.0MP APS-C (22.3 x 14.9 mm ) sized CMOS sensor and features Digic 5 processor. On the other hand, Canon 6D has a
20.0MP Full frame (36 x 24 mm ) sized CMOS sensor and features Digic 5+ processor.
Below you can see the 650D and 6D sensor size comparison.
Sensor Size and Resolution Comparison image of Canon 650D and Canon 6D Cameras
As seen above, Canon 6D has a 2.6x Larger sensor area than Canon 650D. Larger sensors give photographer more control on the depth of field and blurry background compared to smaller sensor when shot in 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 650D and Canon 6D sensors have been tested by DxO and the results show that 6D has a better overall score of 82, 20 points higher compared to 650D's score of 62.
Model
Overall
Color Depth
Dynamic Range
Low-light ISO
Canon 650D
62
21.7 bits
11.2 Evs
722 ISO
Canon 6D
82
23.8 bits
12.1 Evs
2340 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 650D
or the
Canon 6D ,
including hyperfocal distance.
One thing to watch when comparing these two: they have different sensor sizes
(APS-C versus Full frame),
so compare them at the same framing rather than the same focal length.
Put the same focal length on the smaller sensor and it will show less depth of
field, not more, because it also crops tighter. The calculator shows the
full frame equivalent focal length for each body so you can match the framing.
