ZWO 31mm SII 7nm Filter Unmounted (ZWO-SII7NMD31) Mini Only when the film is

Only when the film is being put under stress by an improper cell mount it performs just like any single side coated glass-filter made of untreated float glass

and better cable management overall

Infrared wavelength 700-1100nm cut-off

It has caught the spotlight for its aesthetic and streamline appeal since its entry to the market

ZWO 31mm SII 7nm Filter Unmounted (ZWO-SII7NMD31) Mini Only when the film isNarrowband filter do not eliminate the effects of light pollution or increase the objects brightness. In many cases, they increase the contrast between nebula and night sky, not brightening the nebula. The ZWO narrowband S II 7nm filter passes light at 672nm wavelength with a bandpass of 7nm which is designed for nebula observation . It is suitable for visual observation on most emission nebulae, planetary nebulae and supernova remnants, use it with H