Today and tomorrow (5/11 and 5/12) an extremely large group of sunspots is directly facing the earth: http://abcnews.go.com/blogs/technology/2012/05/enormous-sunspot-could-lead-to-solar-flares/ I went outside this morning and using a ND 7.0 filter could see it by eye, so photographs could be quite spectacular. Note- if you are not sure what 'ND 7.0' means, then don't risk damaging your eye and/or camera. Notes: when I photograph the sun, I use at least ND 5.0, no polarizers, but keep the UV filter. The order matters- the UV filter goes at the back end, after the ND filters, to prevent damage. The ND filters have been absorptive, but I just found a reflective one buried in one of the labs which I'll try today. Even at ND 5.0 I have to stop down to f/44 (f/22 + 2X tele) and expose at 1/8000 s. If I want to add a color filter, that goes last, after everything else. Good luck!