ZWO 31mm Ha SII OIII 7nm Narrowband Filter Set
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ZWO 31mm Ha SII OIII 7nm Narrowband Filter Set

£452.00
  (1 Review)
✓ 2 year warranty

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3x in stock shipped 1-2 working days
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Special Bundle Prices - Save £'s!

ZWO offer a number of imaging bundles that include the ASI1600MM-Pro, a filter wheel and filters to make it easy to get started and save some money!

About this product

Model:  zwo_hso7_31mm
Part Number:  ZWO-NB7nmD31

New & Improved with higher light transmission and less reflection (reduced halos around bright stars). 

Ha 7nm

Has a bandwidth of 7nm and passes light at 656nm wavelength. 

OIII 7nm

Has a bandwidth of 7nm and passes light at 500nm wavelength. 

SII 7nm

Has a bandwidth of 7nm and passes light at 672nm wavelength.

FEATURES

  • FWHM: 7±0.5nm
  • Glass Thickness 2.0+/-0.03 mm (1.25”/31mm/36mm)
  • Fine optically polished glass ensures accurate 1/4 wavefront over both surfaces
  • Around 90% transmission at selected wavelengths
  • Infrared wavelength 700-1100nm cut-off
  • <0.1% transmission of off-band, OD3 (Optical Density)

Transmission Curve

Customer reviews

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First Impression
25 April 2019  | 

Now folks. I can say straight away that my review is based only on quality / presentation etc, as it's probably going to be a few months until I use these!
I am building up my kit ready for the winters viewing and imaging season! I bought these to add to my filter wheel and the quality certainly looks excellent. Handy storage boxes too. This is a set of most useable filter types for the kind of imaging I am planning. Looks good so far roll on October! Thanks FLO

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