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ZWO Hα 7 nm Filter - 36mm - Ha7nmD36

ZWO Hα 7 nm Filter - 36mm - Ha7nmD36 - Main image
$116.61 $169 In stock

Category: Telescope Accessories

ZWO 36mm H-Alpha 7 nm Filter

The ZWO Ha 7nm 36mm Filter is 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.

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. Explore one of the main building blocks of our universe by imaging in Hydrogen-Alpha with a ZWO ASI camera, a filter wheel, and this narrowband filter!

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Customer Reviews (4.6 / 5 · 5 reviews)

Mia Z. ★★★★★

First clear night with this filter and the contrast on the Orion nebula was noticeably sharper than with my old broadband filter. The narrow 7nm bandpass really cut through the urban skyglow.

Miles L. ★★★★★

The 1/4 wave polish is evident the moment you attach it—star halos on bright nebulae just disappear, leaving crisp detail. Threads sit perfectly in the filter wheel with zero tilt, and the 7nm bandpass really cuts through moonlit skies.

Evelyn ★★★★★

Switching from my old broadband filter to this 7nm narrowband made a huge difference in capturing the Horsehead Nebula—the contrast on hydrogen-alpha detail is stunning. I love how sharp the stars look, even at f/7.