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ZWO SII 7nm Filter - 31mm - SII31 - Used - SOLD

SKU: UEQ-12713-ZWO-SII31

  • This ZWO SII 7nm Filter is Used and in Excellent Condition. Upon inspection, we found that the filter is fully functional. The original box is missing and has been replaced. Otherwise, everything looks excellent.
  • Image shows new product.
  • Comes with High Point 90-Day Warranty

ZWO SII 7nm CCD Imaging Filter - 31mm

Sulfur is in the deep red of the spectrum near 672 nm. When combined with H-a and OIII (Hydrogen-Alpha and Oxygen III, or double ionized oxygen) SII will produce images with colors that are reminiscent of those taken by the Hubble Space Telescope.

The ZWO SII 7nm 31mm 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.