Spectacle reduction from 2 "to 1.25" is additionally equipped with a T2 thread, allowing the attachment of a camera with a replaceable optic (by the appropriate T-ring) or a astronomical camera mounted on T2. The reduction is made of anodized aluminum. It has an internal clamping ring and two counter-lock screws. The filter thread from the bottom of the sleeve allows the connection of filters in the 2 "standard.