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a line filter for only the two emission lines of oxygen
lightweight
and plastic parts
Featuring a 254mm (10-inch) primary mirror
Enhances the photography of emission nebulae in the city
Nebula Filter S-II 2-inch 12nm spo-enabled a line filter for onlyIn addition to the turbulence in the air, the brightening of the night sky is the greatest obstacle to observing faint objects beyond the solar system. Street lights and other artificial lighting mean that the sky in human settlements is no longer properly black. As a result, the contrast and thus the perception of the deep sky objects also suffer. Depending on the type of celestial object, however, part of the interfering light can be filtered out,
