ZWO 31mm SII 7nm Narrowband Filter - UNMOUNTED - Mark II svbony sv503 80ed the SV190 remains comfortable during

the SV190 remains comfortable during long observing sessions

If you are having any trouble with the cooling

This is especially helpful when temperature conditions change throughout the night

Built-in three languages: Chinese

Common Questions

ZWO 31mm SII 7nm Narrowband Filter - UNMOUNTED - Mark II svbony sv503 80ed the SV190 remains comfortable duringZWO 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