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: SII 7nm Ha 7nm OIII 7nm 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” mountedTransmitted Wavefront RMS: λ/4Parallelism(arcsec): 30s Technical Specification Filter Peak Transmission Half Width Transmission in Band 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% What's in the box? Three Narrowband Filters Sulphur - SII 7nm Hydrogen-Alpha - Ha 7nm Oxygen - OIII 7nm Wavlength printout_Ha Wavlength printout_OIII Wavlength printout_SII
