With parfocal ring equipped telescope eyepieces you can change magnifications quickly and easily. Eliminate the need to make focus adjustments when changing telescope eyepieces. This set of 2 Alstar Parfocal Rings lets you make a set of non-parfocal 2" telescope eyepieces parfocal for more efficient observing. They are made of precision machined aluminium with black anodizing. Also useful for setting focus point of calibration eyepiece used for focusing an imaging or guide camera.
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