Ricoh GR IV HDF has a
26.0MP APS-C (23.5 x 15.6 mm ) sized CMOS sensor . On the other hand, Ricoh GR III has a
24.0MP APS-C (23.5 x 15.6 mm ) sized CMOS sensor .
Another similarity between these two cameras is that both Ricoh GR III and Ricoh GR IV 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 IV HDF and GR III sensor size comparison.
Sensor Size and Resolution Comparison image of Ricoh GR IV HDF and Ricoh GR III Cameras
Ricoh GR IV HDF and Ricoh GR III 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 III has 6% larger pixel area (15.28µm 2 vs 14.35µm 2 ) compared to Ricoh GR IV HDF, 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 HDF
or the
Ricoh GR III ,
including hyperfocal distance.
