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The Deluxe Focusing Clamp includes 3 thumbscrews for maximum clamping force and security, as well as a captive internal bronze compression ring to prevent marring. In addition, it incorporates a precision helical focusing action with 5mm of travel, which enables a compact means of fine-adjusting focus. This feature makes this clamp particularly well suited for use on the Baader Vario Finder.
The latest version (02/13) now has a lock screw to prevent rotation of the focusing setting.