File:Focal length 1000mm.jpg - Wikimedia Commons
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Is 1000mm Focal Length a Sweet Spot for Beginner Astro Photography? - Beginning Deep Sky Imaging - Cloudy Nights
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AmScope Reflector EQ Telescope 127mm Aperture 1000mm Focal Length+Red Dot Finder | eBay
The 60mm Philosophy: Learn to Savor the View | Star-Splitters
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Celestron AstroMaster 90EQ Telescope 21063
