This review, “Off-axis vision,” appeared in the October 2003 issue of Astronomy magazine. Want to trigger a debate at your next club meeting or star party? Drop this seemingly innocent question on ...

Celestron’s Off-Axis Guider uses an adjustable, multicoated 12.5-millimeter prism that allows you to locate a guide star. It has a fixed-orientation helical focuser and includes all needed spacers and ...