Orion 5122 Long 2-Inch Adapter for Crayford-Type Telescope Focuser<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"> Adapter designed for use with the Orion 2" single speed Crayford focuser to allow focus to be achieved with some reflector telescope optical tubes </span></li><li><span class="a-list-item"> Provides extra height needed when single-speed Crayford focuser is used with Orion 203mm f/4 </span></li><li><span class="a-list-item"> Adapter is not required for use of single-speed Crayford focuser on Orion Dobsonian telescopes </span></li><li><span class="a-list-item"> Allows visual use of eyepieces with specialty focuser and some mounted reflector telescope tubes </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/51kfBL811qL.jpg" noproxy>