OPTOLONG L-Extreme Filter NK-Z Compatible with Nikon Full
OPTOLONG L-Extreme Filter NK-Z Compatible with Nikon Full Frame Micro-Single Camera Built-in Filter Z Series: Z5 Z6 Z6II Z7 Z7II Z8 Z9 ZF The L-eXtreme filter is dual band that passes Ha and OIII emission lines.The advantage of the L-eXtreme filter is that there is no transmission between the H-beta and OIII lines, as there is no nebula emission lines there. In this case, it isn't letting light pollution come through so that maximize nebulas signal and make the sky background darker while imaging. The L-eXtreme filter should better isolate the emission lines only and better protect from light pollution....