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In the 1980's, on the sidewalks of San Francisco, amateur astronomer John Dobson began showing throngs of people how to build and use large aperture scopes, often from scraps. The Dobsonian (Dobs) is now the best-selling large telescope in the world. There are a great variety of…
In the 1980's, on the sidewalks of San Francisco, amateur astronomer John Dobson began showing throngs of people how to build and use large aperture scopes, often from scraps. The Dobsonian (Dobs) is now the best-selling large telescope in the world. There are a great variety of…
