Orion 5599 1.25-Inch Mars Observation Eyepiece 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"> High-performance observational eyepiece filter markedly improves views of Mars </span></li><li><span class="a-list-item"> Fully-coated Mars filter increases contrast to bring out subtle details on the disc of the red planet </span></li><li><span class="a-list-item"> When using the Mars filter on a clear， dark evening you'll see polar ice cap detail， subtle mare shadings， duststorm and cloud activity </span></li><li><span class="a-list-item"> Eyepiece filter dramatically improves views of Mars even in smaller astronomical telescopes </span></li><li><span class="a-list-item"> Designed to fit 1.25" telescope eyepieces with filter threads. Metal filter cell construction. </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/519NT5HxdnL.jpg" noproxy>