Both Ricoh GR IIIx and Sony A7c have 24.0 MP resolution sensors but Ricoh GR IIIx's sensor is APS-C (23.5 x 15.6 mm ) and Sony A7c's sensor is Full frame (35.8 x 23.8 mm ).
Since Sony A7c'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 Ricoh GR IIIx.
Another difference between these two cameras is that Ricoh GR IIIx'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 GR IIIx and A7c sensor size comparison.
Sensor Size and Resolution Comparison image of Ricoh GR IIIx and Sony A7c Cameras
As seen above, Sony A7c has a 2.3x Larger sensor area than Ricoh GR IIIx. 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
Ricoh GR IIIx
or the
Sony A7c ,
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.
