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This Focus Ring Cattail is compatible with Super Yoter R 50 mm thermal sight. However, it is not compatible with the Super Yoter LRF or any other Bering Optics thermal scopes.
Cattail Ring is designed to make the front lens focus adjustment more convenient. It is especially useful when you operate in cold temperatures, wearing gloves.
It is very easy to install:
1) Unscrew the handle cap. 2) Slightly split threaded part of the cattail ring and put it around the focus ring of your thermal scope. 3) Position the cattail ring around the focus ring to ensure that it seats tight and that the threaded halves of the handle come together. 4) Screw the cap back on the handle. DO NOT OVERTIGHTEN!!!