Vocas Viewfinder Bracket Universal
Designed for use with any viewfinder with a ΒΌ"" thread on the bottom, the Vocas Viewfinder Bracket Universal uses a NATO rail system (not included) to connect the camera to the viewfinder. Its construction prevents the viewfinder from twisting and resulting in a crooked horizon in the resulting image.
Price: 246.75 from Wex Photo Video