Homemade Erecting Prism DIY Refractor TelescopeA straightforward 90º Erecting Prism for telescopes to produce a correctly orientated view and a more comfortable viewing position. I can buy it on Ebay but you can do it in home with binoviewer take from microscope broken very easy and cheap, It nice w...
By: trukmeeilee
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from Instructables: exploring - technology - robots http://ift.tt/1L2UCXg
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