Optolong L-eXtreme Dual Band Filter - 1.25" 120 mm Telescopes Other HEM27 models include the

Other HEM27 models include the base version (H272

provides convenient usage

zero backlash Declination worm wheel: 110 mm

The iconic 8-inch Schmidt-Cassegrain Celestron Telescope has been known for decades as Celestron''s most beloved telescope

Optolong L-eXtreme Dual Band Filter - 1.25" 120 mm Telescopes Other HEM27 models include theThe L eXtreme from Optolong is a dual band filter 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