Ricoh GR Digital IV Preview: 1. Introduction: Digital Photography Review. Suddenly, my nice little old GRD II looks outdated. Wow. The image stabilization is particularly interesting - sure, at 28mm you don't need it, but in low-light situations it would sometimes be really nice. And the even higher resolution screen is not to be sneezed at. Built-in HDR and the fact that the tilt sensor not only detects horizontal rotation but also front/back tilt (tilt) comes into play as well. What the hybrid AF actually brings remains to be seen - I never really had problems with it. The GRD III was, in my opinion, only a marginal update, but the GRD IV sounds really good.