Camera viewfinder accessory mount

A camera viewfinder accessory mount in accordance with the invention includes a receiver mountable at least in part around a camera viewfinder frame. Thread units extend from the receiver. The thread units are defined by extensions having outside threads and inside geometric surfaces. A body portion of the accessory mount has a receiver end for matingly fitting the receiver, and a distal accessory end. The body portion further includes an indexing periphery having a peripheral shape for cooperating with the inside geometric surfaces of the thread units. The body portion also includes a stop radially extending from the periphery and spacedly disposed from the receiver end. A tightening wheel of the accessory mount has internal threads cooperable with the outside threads of the thread units to tighten the body portion receiver end to the camera viewfinder frame.