Ricoh GR - Infinity lock
I don't have the Ricoh GR so I can't answer however the Infinity focus actually is Infinity or not with that camera.
But with some of the older Ricohs, the Infinity setting actually wasn't infinity as far as I know.
Below is two pictures with the old Ricoh Caplio R3 which was in stores around 2005.
The first is taken using the standard Infinity focus setting and the second in which I had switched to Manual focus and set focus as distant possible. If it is not clearly visibly at small size it certainly is at full size. The R3 is only 5mp.