Orion 8762 2-Inch 2x Barlow Lens<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"> Threaded for use with 2" filters </span></li><li><span class="a-list-item"> Requires 54mm (2 1/8") additional back focus </span></li><li><span class="a-list-item"> Features 30mm clear aperture </span></li><li><span class="a-list-item"> Increase the power of any 2" eyepiece by a factor of 2x - for example: makes a 30mm eyepiece perform like a 15mm eyepiece </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/41Qg1QyWzbL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/71uyFKOemBS.png" noproxy>