Spectra Astro-Accessories SureSharp focuser in excellent condition. Sure Sharp ($95) with the right angle attachment. T-mount adapter for Nikon included.
For information see webpage for an explanation of how the Sure Sharp works email me.
Sure Sharp is best 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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