ZWO 31mm SII 7nm Narrowband Filter - UNMOUNTED - Mark II svbony sv503 80ed Oasis Focuser can be installed

Oasis Focuser can be installed on the coarse-tuning side of most telescope focusers

Built-in three languages: Chinese

and most major astronomy imaging applications

convenient and fast

Filter Drawer MINI

ZWO 31mm SII 7nm Narrowband Filter - UNMOUNTED - Mark II svbony sv503 80ed Oasis Focuser can be installedZWO 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