Having extra eyepieces available for your telescope can be really handy. This one is a Celestron collimation eyepiece. It is a standard 1.25 inches in size so will fit on standard sizes focusers or diagonals. It is very easy to align and is more accurate than using a simple collimation tool. It is ideal for use with Newtonians so they can have precise collimation. It has an opening on one end and cross hairs on the other to make it easy to use. It comes with a case to store it in when it is not being used.
Celestron 94182 1.25 Inch Collimation Eyepiece
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