ZWO 31 mm H-alpha SII OIII 7nm Filter Set

ITEM #
ZWO-NBSET7-31MM
  • FWHM:7 plus or minus 0.5nm.
  • Glass Thickness 1.9+/-0.03 mm.
  • Fine-optically polished to ensure accurate 1/4 wavefront over both surfaces.
  • About 90% transmission at H-alpha line 656nm (H-Alpha filter).
  • About 90% transmission at SII line 672nm (SII filter).
  • About 90% transmission at major OIII line 500nm (OIII filter).

Transmission Curve of the ZWO 31 mm Filter Set

ZWO 31 mm Filter Set Transmission Curve Graph
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  • Regular price $425.00

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ZWO 31 mm H-alpha SII OIII 7nm Filter Set

The ZWO 31 mm H-alpha SII OIII 7nm Filter Set allows only Hydrogen, Oxygen, and Sulfur emissions to be photographed. These filters will enhance contrast for these wavelengths and block most wavelengths produced by city lights. Narrowband filters will reduce the transmission of most wavelengths an only allow certain ones narrow bands to pass. 

Technical Data of the ZWO 31 mm Filter Set

SPECIFICATIONS

Bandpass7nm
Filter Thickness1.9 mm
Filter TypeH Alpha
Filter TypeOIII
Filter TypeSII
Free ShippingYes
ShapeRound
Size31mm

INCLUDED ITEMS

  • H-Alpha filter.
  • SII Filter.
  • OIII Filter.
  • Case x3.