Ricoh GR IIIx HDF has a
24.0MP APS-C (23.5 x 15.6 mm ) sized CMOS sensor . On the other hand, Ricoh GR IV has a
26.0MP APS-C (23.5 x 15.6 mm ) sized CMOS sensor .
Another similarity between these two cameras is that both Ricoh GR IV and Ricoh GR IIIx HDF sensors lack anti-alias (Low-Pass) filters. 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 HDF and GR IV sensor size comparison.
Sensor Size and Resolution Comparison image of Ricoh GR IIIx HDF and Ricoh GR IV Cameras
Ricoh GR IIIx HDF and Ricoh GR IV 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 Ricoh GR IIIx HDF has 6% larger pixel area compared to Ricoh GR IV, it has potential to collect more light on pixel level hence 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 IIIx HDF
or the
Ricoh GR IV ,
including hyperfocal distance.
