Both Nikon D7500 and Canon SX740 HS have 21.0 MP resolution sensors but Nikon D7500's sensor is APS-C (23.5 x 15.7 mm ) and Canon SX740 HS's sensor is 1/2.3 (6.17 x 4.55 mm ).
Since Nikon D7500'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 Canon SX740 HS.
Another difference between these two cameras is that Nikon D7500's sensor lacks anti-alias (Low-Pass) filter. Removing anti-alias filter increases the sharpness and level of detail but at the same time, it increases the chance of moiré occurring in certain scenes.
Below you can see the D7500 and SX740 HS sensor size comparison.
Sensor Size and Resolution Comparison image of Nikon D7500 and Canon SX740 HS Cameras
As seen above, Nikon D7500 has a 13.1x Larger sensor area than Canon SX740 HS. 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
Nikon D7500
or the
Canon SX740 HS ,
including hyperfocal distance.
One thing to watch when comparing these two: they have different sensor sizes
(APS-C versus 1/2.3),
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.
