Thank you for viewing. [Excellent Condition] BRONICA Diopter Correction Lens + Unidentified Compatible Finder is for sale. Based on my research, I believe this is a diopter correction lens for the ETR Si waist-level finder, but I cannot confirm this. Please research your camera, etc., thoroughly before purchasing. Returns based on the inability to install the lens will not be accepted. #okcamera_productlist #okcamera_Bronica I also have other cameras and lenses for sale. Please take a look if you'd like.