ZWO 31mm Ha, SII and OIII 7nm narrowband filter set.
This new Narrowband filter set from ZWO includes H-Alpha, Oxygen III, and Sulfur-II filters for high contrast deep sky images.
NOTE: Photo shows 1.25" filters but the filters supplied are 31mm.
- Thickness 1.9+/-0.03 mm (1.25”/31mm/36mm)
- Fine-optically polished to ensure accurate 1/4 wavefront over the both surfaces
- 80% transmission at H-alpha line 656nm (H-Alpha filter)
- 80% transmission at SII line 672nm (SII filter)
- 80% transmission at major OIII line 500nm (OIII filter)
The ZWO H-Alpha filter has a bandpass of 7nm and passes light at 656nm wavelength, light transmission rate comes up to 80%. Best choice of narrowband H-alpha astrophotography filter for high-contrast imaging and revealing rich details of the nebula even in areas with strong light pollution, just prepare to experience the infinite fun with it!
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-colour CCD astrophotography.
The ZWO narrowband O-III 7nm filter is designed for nebula observation allowing 7nm bandwidth of light centred on a wavelength of 500nm through, which corresponds to OIII emission lines, blocking out all other light. Adding the ZWO O-III Narrowband filter to your imaging collection will help you go beyond the RGB imaging and will help capture your favourite nebulas in a totally new light, no matter how polluted your skies may be!