Optolong L-eXtreme Dual 7nm Ha/OIII Narrowband Filter - 2" Diagonals high speed mode

high speed mode

Each primary mirror and elliptical diagonal mirror is coated with aluminum and then over-coated with hard quartz (SiO4)

The finely made glass lens acts as a beamsplitter to combine the natural sky background with the superimposed red pointing "star

66” is designed to make it a perfect must-have tool for an astronomer’s night out

Optolong L-eXtreme Dual 7nm Ha/OIII Narrowband Filter - 2" Diagonals high speed modeThe L eXtreme filter from Optolong is 7nm dual band in that passes Ha and OIII emission lines. The advantage of the L eXtreme filter over the L eNhance, which is a tri band filter, is that there are 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 maximizes a nebula's signal and makes the sky background darker while imaging. The L eXtreme