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Thats awesome, thanks for sharing!
It works the same with binoculars, i don't even think you need to tape over them.
There are a couple of factors. One is that you are concentrating sunlight at a focal point inside the telescope near the eyepiece. If it has a powerful magnification, the telescope can get to hot, and sustain damage. If it is a reflector telescope, the mirrors inside can be damaged from the magnified sunlight as well.
Great news! Please share some pictures! https://twitter.com/aaron_stafford
To protect the mirror, you could also try removing the 90 degree elbow and stick the eyepiece in so it is pointing straight back, then your projection would be on the ground below the telescope.
Thats an interesting question. I'm not sure. The light is most concentrated just before the eyepiece, so that is the area where something could go wrong - there is a mirror there, so if anything were to be damaged, it would be that. If you are concerned, you could try giving the telescope periodic breaks to cool, or maybe even wrapping an icepack in that area. As a reference, this suggests that anything with a lens smaller than 4" should be fine to point at the sun: http://www.skyandtelescope.com/astronomy-news/how-...Please let me know how it goes, and also share some pictures! https://twitter.com/aaron_stafford
Be careful looking at the sun this way, just because it looks like it blocks enough sunlight doesn't mean it actually does!
Awesome! Please share some pictures! https://twitter.com/aaron_stafford
I am happy to jog the memory! Its easy to forget and think the best way to see the sun is looking towards it, even though you can see it so much better when looking away!