Orion 7725 14.21-Inch ID Off Axis Solar Filter<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"> White-light solar filter fits Orion SkyQuest XT12 Dobsonian telescope and XX12 Truss Tube Dobsonian telescopes for great views of sunspots and the solar surface </span></li><li><span class="a-list-item"> Safely covers entire telescope aperture， with a 4" off-axis glass filter which allows safe solar viewing </span></li><li><span class="a-list-item"> Filter inside diameter is 14.21" and each Orion telescope solar filter fits tube diameters up to 0.25" smaller than specified size </span></li><li><span class="a-list-item"> Each Orion telescope solar filter includes three equidistant thumbscrews， 4x 1/16" thick adhesive foam tabs， and 4x 1/8" thick adhesive foam tabs for customized friction fit to your telescope </span></li><li><span class="a-list-item"> Note: All Orion solar filters are designed for use with an adequate friction fit attachment. Thumbscrews should ONLY be used to keep filter securely in place once a friction fit has been achieved </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/416GDph43YL.jpg" noproxy>