Product no.: 61976Manufacturer: Orion
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This set of 4 Orion Parfocal Rings lets you make a set of non-parfocal 1.25" telescope eyepieces parfocal for more efficient observing.
They eliminate the need to make focus adjustments when changing telescope eyepieces: With parfocal ring equipped telescope eyepieces you can change magnifications quickly and easily.
Also useful for setting focus point of calibration eyepiece used for focusing an imaging or guide camera.
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