Both Casio EX-Z400 and Ricoh GXR GR Lens A12 28mm have 12.0 MP resolution sensors but Casio EX-Z400's sensor is 1/2.3-inch (6.17 x 4.55 mm ) and Ricoh GXR GR Lens A12 28mm's sensor is APS-C (23.6 x 15.7 mm ).
Since Ricoh GXR GR Lens A12 28mm'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 Casio EX-Z400.
Below you can see the EX-Z400 and GXR GR Lens A12 28mm F2.5 sensor size comparison.
Sensor Size and Resolution Comparison image of Casio EX-Z400 and Ricoh GXR GR Lens A12 28mm Cameras
As seen above, Ricoh GXR GR Lens A12 28mm has a 13.2x Larger sensor area than Casio EX-Z400. 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
Casio EX-Z400
or the
Ricoh GXR GR Lens A12 28mm ,
including hyperfocal distance.
One thing to watch when comparing these two: they have different sensor sizes
(1/2.3-inch versus APS-C),
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.
