The Starsweeper is a 0.6x reducer for use with Schmidt Cassegrains and binoviewers which don't have a power switch. It has 2" filter threads and can screw into a 1.25/2" adapter in front of the binoviewer or the nose of a diagonal.
https://denkmeier.com/index.cfm/fuse...d/69/index.cfm
As new condition.
$125 including post