Optolong L-eXtreme Dual 7nm Ha/OIII Narrowband Filter - 2" type-eyepiece-accessories including a 2" dual-speed focuser

including a 2" dual-speed focuser

The distinction you'll discover about Tele Vue Bandmate filters is their consistency

Angle: 90 degrees

Author:  Nicole Mortillaro - Royal Astronomical Society of Canada

Decrease your telescope effective focal length by 50 percent to conceal tracking errors

Optolong L-eXtreme Dual 7nm Ha/OIII Narrowband Filter - 2" type-eyepiece-accessories including a 2" dual-speed focuserThe 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