Antlia Pro 3nm SHO 36mm filters

The Antlia 3 nm Pro set has three narrowband filters with a 3 nm bandwidth (FWHM): H-alpha at 656.3 nm, O III at 500.7 nm and S II at 672.4 nm. Antlia rates them at over 88 % peak transmission, with OD5 blocking from 300 to 1000 nm, for optics as fast as f/3. Such a narrow band passes the emission of the nebulae and blocks most of the light pollution and moonlight.

I use the unmounted 36 mm version in the ZWO EFW 7 × 36 mm filter wheel of the ASI2600MM Pro, together with the Antlia LRGB-V Pro filters.