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ZWO 3 Piece Ha/SII/OIII 7nm Filter Set

3 In Stock - Ships Today if Ordered by 2pm EDT! (Mon - Fri)
Filter
ZWO
NB7nmD1.25
$371.00 USD
We will price-match in-stock Canadian astronomy dealer pricing

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The ZWO H-Alpha filter has a bandpass of 7nm, centred on light at 656nm, with a light transmission of 80%. This is the best choice for narrowband H-alpha astrophotography for high-contrast imaging, revealing rich details of the nebula even in areas with strong light pollution.

Please Note: The 31mm and 36mm filters are unmounted.

31mm-ha600

The ZWO narrowband S-II 7nm filter passes light at 672nm wavelength with a bandpass of 7nm which is designed for nebula observation . It is suitable for visual observation on most emission nebulae, planetary nebulae and supernova remnants.  Use it with H-alpha and OIII narrowband filters (SHO Set) for tri-color CCD astrophotography.

 

31mm-sii600

The ZWO narrowband O-III 7nm filter is designed for nebula observation, allowing 7nm light centered on a wavelength of 500nm through, corresponding to OIII emission lines and blocking out all other light.  Adding the ZWO O-III Narrowband filter to your imaging collection will help you go beyond RGB imaging and will help capture your favorite nebulae in a totally new light, no matter how polluted your skies may be!

31mm-oiii600

  • The Hubble palette can be made using the combination of H-alpha, OIII-CCD and SII-CCD, such as the famous “Pillars of Creation” (M16 Eagle Nebula)
  • Narrowband imaging with a SHO set (H-alpha, OIII-CCD and SII-CCD) can be done with the moon up in heavy light pollution
  • The H-alpha filter is the first narrowband addition to LRGB set for most imagers who blend a black-and-white Ha image into RGB data to enhance structural detail while maintaining a natural look

Ha-side-1

 

Technical Data

  • FWHM:7±0.5nm
  • Glass Thickness 2.0+/-0.03 mm  (1.25”/31mm/36mm)
  • Fine-optically polished to ensure accurate 1/4 wavefront  over the 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 )
  • Infrared wavelength 700-1100nm cut-off
  • <0.1% transmission of off-band, OD3(Optical Density)

 

Transmission Curve

NB filters TP

New Narrowband & Old Narrowband Filter Comparison:

New Ha filters are based on new glass base, less reflection( less halo of bright stars).

Ha-compare

 

New SII filters are based on new glass base, less reflection( less halo of bright stars).

SII-compare

 

New OIII filters are based on same glass base, new coating standard, better block rate of off-band.

OIII-compare

 

Here is a test of ZWO Ha Filters (ASI1600 mono camera, single frame, 300s, DDP in MaximDL) :

real test of Ha

Reviews

https://www.cloudynights.com/topic/627187-review-of-the-new-zwo-narrowband-filters-comparison-to-the-old-zwo-and-astrodon-filters/

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