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Canon EF 400mm f/5
the finderscope
The distinction you'll discover about Tele Vue Bandmate filters is their consistency
and which is the bottom
further reducing backlash
Optolong L-eXtreme Dual 7nm Ha/OIII Narrowband Filter - 2" type-eyepiece-accessories Canon EF 400mm f/5The 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
US$ 25.00
US$ 10.90
US$ 79.00
