Spectra Astro-Accessories SureSharp focuser in excellent condition. Sure Sharp with ($85) or without ($65) the right angle attachment.
For information see webpage for an explanation of how the Sure Sharp works email me.
Modification made for kinfe edge instead of ronchi screen requires a star be centered to focus, which makes it a little more difficult to use, but results in much better focus. Modified Sure Sharp is strictly for final fine focusing of camera using a star. Once the scope is focused on a nearby star, the scope is then moved to frame the object to be photographed.
This is a great system for focusing a camera!
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