Canon 70D has a
20.0MP APS-C (22.5 x 15 mm ) sized CMOS sensor and features Digic 5+ processor. On the other hand, Samsung GX-20 has a
15.0MP APS-C (23.4 x 15.6 mm ) sized CMOS sensor .
Canon 70D's sensor provides 5MP more than Samsung GX-20's sensor, which gives a significant advantage in real life. You can print your images larger or crop more freely.
On the other hand, please keep in mind that Max sensor resolution is not the only determinant of resolving power. Factors such as the optical elements, low pass filter, pixel size and sensor technology also affects the final resolution of the captured image.
Below you can see the 70D and GX-20 sensor size comparison.
Sensor Size and Resolution Comparison image of Canon 70D and Samsung GX-20 Cameras
Canon 70D and Samsung GX-20 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
At Camera Decision, we also look at Dxo Mark sensors when available as we think it is a good indicator of image quality.
Model
Overall
Color Depth
Dynamic Range
Low-light ISO
Canon 70D
68
22.5 bits
11.6 Evs
926 ISO
Samsung GX-20
68
23.1 bits
11.2 Evs
714 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 70D
or the
Samsung GX-20 ,
including hyperfocal distance.
