ZWO 31mm SII 7nm Narrowband Filter - UNMOUNTED - Mark II SVBONY SV101 MFR Coating: The 12nm filters

MFR Coating: The 12nm filters can be used with all instruments down to f/1

designed for full-frame astrophotography and refined visual observing

Sensitivity: -108dBm

this small feature can make a surprisingly large difference to reliability

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

ZWO 31mm SII 7nm Narrowband Filter - UNMOUNTED - Mark II SVBONY SV101 MFR Coating: The 12nm filtersZWO 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