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you notice the stars at the edge have taken on an unnatural comet-like shape
Our 68° 34mm Argon-Purged Waterproof Eyepiece is easier to clean with no risk of the cleaning solution and migrates from the top of the lens and seeping around edges to trapped between elements
screw the drawtube to this plate
but it will be around 5Å
Ca II K-Line
Explore Scientific 152mm Achromat Refractor Optical Tube Nikon you notice the stars atExplore Scientific 152mm Achromat Refractor Optical Tube We introduce this high quality and functional 152mm Achromat Refractor Optical Tube by Explore Scientific. This AR152 Air Spaced Doublet is a classic air spaced, crown and flint doublet achromatic refractor. At (6 inches) 152mm of aperture, it gives the highest resolution of the AR Series and the brightest images. The goal of the design was to offer a very significant value by providing precise