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Excellent craftsmanship
MFR Coating: The 12nm filters can be used with all instruments down to f/1
Adding the ZWO OIII narrowband filter to your imaging collection will help you go beyond the RGB imaging and will help capture your favorite nebulae in a totally new light
this small feature can make a surprisingly large difference to reliability
designed for full-frame astrophotography and refined visual observing
ZWO 31mm SII 7nm Narrowband Filter - UNMOUNTED - Mark II SVBONY SV101 Excellent craftsmanshipZWO 31mm SII 7nm Narrowband Filter UNMOUNTED Mark II (Since mid 2018 ZWO supplies a new, improved version of their narrowband filters. The difference is visible when shooting night sky "landscapes" with very bright stars in the field of view, especially with the H alpha and SII filters, the difference is very very subtle when using the new OIII filters) The ZWO SII 7nm narrowband filter passes light at 672nm wavelength with a bandpass of 7nm which is
