No filtering use only a Seymour Glass solar filter -
http://www.seymoursolar.com/product_...products_id=94
Bought it some time ago after purchasing it suffered my 3rd melanoma and decided to hold off for a bit.
Only tried 3 shot before I felt the sun burning it rays on me.
I thought I could not get the granulations but was surprised. It is out of focus a bit so I may expect more from it later. I am making a sun shield for my own protection and keeping the camera out of the sun as well.