Both Canon 70D and Panasonic ZS70 have 20.0 MP resolution sensors but Canon 70D's sensor is APS-C (22.5 x 15 mm ) and Panasonic ZS70's sensor is 1/2.3-inch (6.17 x 4.55 mm ).
Since Canon 70D's has a larger sensor area with the same resolution, this means that it also has a larger pixel area hence better light collecting capacity for a given aperture compared to Panasonic ZS70.
Below you can see the 70D and ZS70 sensor size comparison.
Sensor Size and Resolution Comparison image of Canon 70D and Panasonic ZS70 Cameras
As seen above, Canon 70D has a 12.0x Larger sensor area than Panasonic ZS70. 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.
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
Panasonic ZS70 ,
including hyperfocal distance.
One thing to watch when comparing these two: they have different sensor sizes
(APS-C versus 1/2.3-inch),
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.
