Astronomers can get pretty finicky about cleanliness, especially when it comes to their telescope's optics.  Unfortunately, dust is everywhere and it is next to impossible to keep it entirely off a  telescope's optics.  However, you don't have to allow dust to settle on your optics between observing runs.  Astrozap Dust Covers are proudly made in the USA of a cotton and nylon blend material.  A sewed in elastic strap allows the Astrozap Dust Cover to fit snugly over the open end of a Newtonian telescope, covering the tube and keeping dust out.  This helps protect the optics from excessive dust accumulation on the primary and secondary mirrors, which translates into sharper images. 

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AstroZap Dobsonian Dust Cover Questions & Answers

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