Mamiya RZ67 WLF Waist Level Finder Diopter -3 [MINT]

This is a -3 diopter that replaces the standard diopter in the RZ waist level. I believe that it is far sighted; it allows me to use the waist level WITH my glasses on (which I cannot do otherwise).It is in mint condition and works perfectly.SKU: 250210-5