Is this likely to damage my eyes or will I be OK?
wanted serious replies
I wasn't going to bother, but it was cloudy, so I stuck my never-before-used 10 stop on a lens and hand held at silly ISO on a D5200!
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It depends. I measured a plan glass lens protection filter for IR blocking and found it blocked quite a bit. I then measured my 10 stop filter and found it blocked so much heat that what was getting through was unmeasurable. Someone with better equipment said he'd measured a few 10 stop filters and found that for IR they were mostly only 6 stop IR filters. I guess my crude measurements would find a 6 stop reduction as letting through an unmeasurasble amount. So the answer to your question about your filter is that nobody knows. Since a quick glance at the sun with the named eye is OK, obviously a quick glance through your big stopper will be OK, but since the damage is painless you shouldn't stare through it.wanted serious replies