Orion 5587 1.25-Inch H-Alpha Extra-Narrowband 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"> Take high-contrast CCD images of emission nebulas in full moonlight or in extreme light pollution with this specialized extra narrowband h-alpha astrophotography filter </span></li><li><span class="a-list-item"> Astrophotography filter provides 90% transmission at H-alpha line of 656.3nm and very narrow bandpass of 7nm </span></li><li><span class="a-list-item"> Reveals subtle nebular details which are usually washed out by contrast-killing broadband light </span></li><li><span class="a-list-item"> Also works great in conjunction with other filters for more advanced astrophotography techniques </span></li><li><span class="a-list-item"> Astrophotography filter threads into standard 1.25" camera nosepiece， Orion Nautilus 1.25" Filter Wheel or Orion Multiple 1.25" Filter Wheel </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/519wTxQ3NhL.jpg" noproxy>