During the Transit of Mercury a few years ago, an Astronomy professor on campus had telescopes set up. Some were set up to project an image through the viewfinder onto a white sheet, and some had filters over the lens to view it directly. I wanted to try this with my own refracting telescope, and I swear one of the "filters" he was using was simple aluminum foil. Problem is, I can't find ANY info. out there on whether this is safe or not.

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logo Can you view the Sun through a telescope with aluminum foil over the lens?
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