The Atik narrow band filter are designed with a band pass of 7 nm to aid in capturing all a nebula’s photons while the vast majority of the broad band light pollution is stopped. The result is a much higher signal to noise revealing faint details in nebulas. The Narrow band filter set comprises of Hydrogen-Alpha (Ha), Sulphur (SII) and Oxygen (OIII).
The SHO narrow band filter set is compatible with our filter wheels and allows astrophotographers to capture deep-sky objects in spectacular narrow band. This filter set is commonly used to image objects in the Hubble pallet.
Bandwidth:
Peak Transmission: minimum 80%
CWL (centre of wavelength):
- Ha 656.3nm
- SII 671.6nm
- OIII 500.7nm
Size: 1.25” mounted, 36mm unmounted or 2” mounted
Transmitted Wavefront RMS: λ/4
Parallelism(arcsec): 30s
Specifications: Atik Narrow Band Filter Set
Filter Peak Transmission Half Width Transmission in Ban Transmission out of Band
Hydrogen Alpha 656.3nm 7nm >80% Maximum＜0.3% Average 0.1%
Oxygen III 500.7nm 7nm >80% Maximum＜0.3% Average 0.1%
Sulphur II 671.6nm 7nm >80% Maximum＜0.3% Average 0.1%
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