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The filter isolates the H-Alpha and O-III emission lines from nebulae so that the contrast and signal-to-noise ratio between the nebula and the background are maximized
kids can get an up-close look at the microscopic universe—from plant cells to pond water to brine shrimp
It should be fairly quick and simple
5 refractors
Dobsonian Shroud for 16" Truss Tube DOB Telescope 18-4mm-eye-relief The filter isolates the H-AlphaKeep out stray and unwanted light from your 16" Truss Tube Dobsonian telescope with a lightweight light shroud. Keeping the path dark between your secondary and primary mirror will boost image contrast and brightness bringing out more details. Constructed of opaque black nylon with excellent stretch, each end of our DOB light shroud has an elastic band to keep the shroud in place and allow for an easy fit and installation. Breathable nylon will let
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