1.25inch Orion Telescope Eyepiece Parfocal Rings， Set of Four<div style="text-align: left;"><strong>[Product Information]</strong><ul><li id="replacementPartsFitmentBullet" class="aok-hidden" data-doesntfitmessage="We're not sure this item fits your " data-fitsmessage="This fits your "><span class="a-list-item"><span id="replacementPartsFitmentBulletInner"><a href="#" class="a-link-normal hsx-rpp-fitment-focus">Enter your model number</a>to make sure this fits.</span></span></li><li><span class="a-list-item"> This set of 4 Orion Parfocal Rings lets you make a set of non-parfocal 1.25" telescope eyepieces parfocal for more efficient observing </span></li><li><span class="a-list-item"> Eliminate the need to make focus adjustments when changing telescope eyepieces </span></li><li><span class="a-list-item"> Each black anodized aluminum parfocal ring features three equidistant setscrews for secure attachment to any 1.25" telescope eyepiece barrel </span></li><li><span class="a-list-item"> With parfocal ring equipped telescope eyepieces you can change magnifications quickly and easily </span></li><li><span class="a-list-item"> Also useful for setting focus point of calibration eyepiece used for focusing an imaging or guide camera </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/413Gw7RzCDL.jpg" noproxy>