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I did a school solar field day with my 20 cm SCT and left the scope pointing at the sun with my thousand oaks filter on,forgetting about the finder scope which only had a cover on the eyepiece end, one of the kids told me that the scope was on fire as there was smoke coming from my finder, after examening the cap of the finder scope there was a perfect eliptical plastic lens in the middle of the cap, I pointed out to the kids that was what could happen to their eyes if they looked at the sun with any optical magnification.
40cm Dob with Argo navis
20cm ultima celestron
15x65 Bino's
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