ZWO 2″ Ha SII OIII 7nm Narrowband Filter Set
AED 2,600.00
ZWO Narrowband Filter Set with 2″ OIII, SII, and H-Alpha Filters
- Narrowband Filters: Includes three filters for Hydrogen Alpha (Ha), Sulfur II (SII), and Oxygen III (OIII).
- Bandwidth: Each filter has a bandwidth of 7nm.
- Peak Transmission: Over 80% transmission at the key wavelengths:
- Ha: 656nm
- SII: 672nm
- OIII: 500nm
- Glass Thickness: 2mm thick, fine-optically polished to 1/4 wavefront accuracy.
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Description
ZWO 2″ Narrowband Filter Set – OIII, Ha, SII
The ZWO 2” SHO Filter Set includes three 2” mounted astrophotography filters that pass light in a narrow 7nm band from ionized sulfur (SII) at 672nm, Hydrogen Alpha (at 656nm), and ionized oxygen (OIII) near 500nm. By taking individual images with each of these filters and a monochrome astronomy camera (sold separately) and combining the images with standard processing techniques, you can create high-contrast images of emission nebulae (like the Orion, Lagoon, and Eagle Nebulae), planetary nebulae (such as the Ring, Dumbbell and Helix Nebulae), and supernova remnants such as the Veil Nebula.
Narrowband 2″ Filter Set Specifications
- Filter Size: 2″
- Mechanical Thickness: 7.5mm (5mm + 2.5mm thread)
- Thread: M48.5×0.75 male thread
- FWHM: 7±0.5nm
- H-Alpha Transmission Rate: About 90% transmission
- SII Transmission Rate: About 90% transmission
- OIII Transmission Rate at 500nm: About 90% transmission
- Infrared wavelength cut-off: 700-1100nm
- Transmission of off-band: <0.1%, OD3(Optical Density)
- Main field of application: photography of dim nebulae
- Anti light-pollution: yes
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