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4 and a 500mm focal length
a moon filter
The visual effect of these eyepieces with their long eye-relief and their 82° apparent field is truly a full-immersion experience
For observing faint planetary nebulae
Nebula Filter H-Alpha 2-inch 12nm 200-400 Download Manual HereIn 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,
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