An interesting phenomenon: Looking at the sun with my 50mm f/9 refractor at about 28X, I thought I could see a tiny white dot near the edge of the umbra. At 100X in my 70mm f/10 refractor, there is no sign of the white spot. Must be a contrast artifact of my eye, related to the "black drop" effect of Mercury during a transit. This spot would be a good candidate for a time-lapse movie if someone felt like imaging all-day long! Greg, I highly recommend the Baader mylar solar filter material. The view is superior to that given by any other white-light filter material I've ever used, including evaporated metal-on-glass. It's also inexpensive enough to make a full-aperture filter for a larger scope. C. --- Greg Taylor <astronomus_maximus@yahoo.com> wrote:
I just picked up some #13 Welder's glass. The spot is very easily seen naked eye. I need to get a solar filter for one of my scopes.
Greg
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