Ricoh GR IV has a
26.0MP APS-C (23.5 x 15.6 mm ) sized CMOS sensor . On the other hand, Sony A77 has a
24.0MP APS-C (23.5 x 15.6 mm ) sized CMOS sensor and features Bionz processor.
Another difference between these two cameras is that Ricoh GR IV'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 IV and A77 sensor size comparison.
Sensor Size and Resolution Comparison image of Ricoh GR IV and Sony A77 Cameras
Ricoh GR IV and Sony A77 have the same sensor sizes so they will provide same level of control over the depth of field when used with same focal length and aperture. On the other hand, since Sony A77 has 6% larger pixel area (15.28µm 2 vs 14.35µm 2 ) compared to Ricoh GR IV, it has larger pixel area to collect light hence potential to have less noise in low light / High ISO images.
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 IV
or the
Sony A77 ,
including hyperfocal distance.
