<h2>ZWO Narrowband Filter Set with 36mm OIII, SII, and H-Alpha Filters</h2>
<p>These ZWO 36mm filters are unmounted. ZWO narrowband filters are fine-optically polished to reach an accuracy of 1/4 wave. Their performance is further enhanced by multiple layers of anti-reflection coatings.</p>
<p><strong>ZWO 36mm Unmounted OIII Filter</strong></p>
<p>OIII, or doubly ionized oxygen, emits light in the blue/green, or teal portion of the spectrum near 500 nm. Planetary nebulae and supernova remnants emit most of their light in the OIII line.</p>
<p><strong>ZWO 36mm Unmounted Ha Filter</strong></p>
<p>Hydrogen-Alpha is the most dominant emission line in star-forming regions. H-Alpha light is created by atomic hydrogen and is responsible for the red color seen in most nebulae.</p>
<p><strong>ZWO 36mm Unmounted SII Filter</strong></p>
<p>Sulfur is in the deep red of the spectrum near 672 nm. When combined with H-alpha and OIII, these three filters will produce images with colors that are reminiscent of those taken by the Hubble Space Telescope.</p>
<p> </p>
<h3>What's Included</h3>
<p> </p>
<ul>
<ul>
<li>ZWO 36mm Round Unmounted H-Alpha Filter</li>
</ul>
</ul>
<p> </p>
<ul>
<ul>
<li>ZWO 36mm Round Unmounted SII Filter</li>
</ul>
</ul>
<p> </p>
<ul>
<ul>
<li>36mm Round Unmounted OIII Filter</li>
</ul>
</ul>
<p> </p>
<ul>
<li>3x Plastic Filter Cases</li>
</ul>
<p> </p>
<table id="product-attribute-specs-table" class="table table--scope-row" tabindex="0" role="table"><caption class="table__caption">Product specification</caption>
<tbody>
<tr role="row">
<th role="rowheader" scope="row">
<div class="table__heading-wrapper">Model Number</div>
</th>
<td class="data" role="gridcell" data-th="Model Number">NB7nmD36</td>
</tr>
<tr role="row">
<th role="rowheader" scope="row">
<div class="table__heading-wrapper">Single Filter, Set, or Accessory</div>
</th>
<td class="data" role="gridcell" data-th="Single Filter, Set, or Accessory">Filter Set</td>
</tr>
<tr role="row">
<th role="rowheader" scope="row">
<div class="table__heading-wrapper">Filter Type</div>
</th>
<td class="data" role="gridcell" data-th="Filter Type">Narrowband Set</td>
</tr>
<tr role="row">
<th role="rowheader" scope="row">
<div class="table__heading-wrapper">Filter Size</div>
</th>
<td class="data" role="gridcell" data-th="Filter Size">36 mm</td>
</tr>
<tr role="row">
<th role="rowheader" scope="row">
<div class="table__heading-wrapper">Filter Shape</div>
</th>
<td class="data" role="gridcell" data-th="Filter Shape">Round</td>
</tr>
<tr role="row">
<th role="rowheader" scope="row">
<div class="table__heading-wrapper">Filter Insert Style</div>
</th>
<td class="data" role="gridcell" data-th="Filter Insert Style">Drop-In</td>
</tr>
<tr role="row">
<th role="rowheader" scope="row">
<div class="table__heading-wrapper">Filter Bandwidth/Bandpass</div>
</th>
<td class="data" role="gridcell" data-th="Filter Bandwidth/Bandpass">7 nm</td>
</tr>
</tbody>
</table>
| Brand | ZWO |