ZWO 36mm SII 7 nm Filter
Take your astrophotography to the next level with this 36 mm SII 7 nm Filter from ZWO! This filter will give you images that rival those taken by the Hubble Space Telescope! Simply combine the filter with a Hydrogen-Alpha and Oxygen III filter and you will be imaging like never before! Sulfur is in the deep red of the spectrum near 672 nm.
The ZWO SII 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.