OK, as usual I'm confused. I thought EV was bound to f-stop/shutter combinations. The exposure that results in will depend on the light energy and the film speed. So my question was (before the transit) what density one would expect for the sun's disk with ISO 100 film and EV 33 (or 11 stops less than 1/1000 and f-64)? And, FWIW, do you know if the welder's glass rating is on an EV scale? That is, #12 reduces brightness by 2^12 times?