@djsundog q: how many stacked filters does it take to no longer be able to see the sun when directly looking at it?
@viv I did the thing and confirmed with two pairs of filters that with any one filter I could see the sun and with two I could not, so adjusting for crappy eyesight, I still get two. So, yay, SCIENCE!
@viv I am guessing two, but I will put my guess to the test when next I venture outside and will report back, for SCIENCE!