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About this product
Model: zwo_hso7_2
Part Number: ZWO-NB7nmD2
New 2" ZWO Narrowband Filters
Narrowband filters reduce the transmission of certain wavelengths of light, including those produced by artificial light including mercury vapour, both high and low pressure sodium vapour lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow).
From 2018 onwards, ZWO upgraded their narrowband filters to reduce halos and improve overall performance.
FEATURES
- FWHM：7±0.5nm
- Fine-optically polished surfaces with 1/4 wavefront accuracy
- Approx 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
Ha 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!
SII Filter
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 tricolor CCD astrophotography.
OIII Filter
The ZWO narrowband O-III 7nm filter is designed for nebula observation allowing the 7nm bandwidth of light centered 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!
Specifications
- Size: 2″
- Thickness: 5mm+2.5mm(thread)
- Thread: M48.5*0.75 male thread
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