A came across this Magfilter adapter ring for Ricoh GR III cameras listed for sale on Amazon: Spotted at the Rioch GR Facebook group: More Ricoh GR III filter solutions: New: H&Y magnetic filter adapter for Ricoh GR III and GR IIIx cameras New: NiSi square filter holder kit for Ricoh GR III cameras New: … Continue reading Magfilter adapter ring for Ricoh GR III cameras