I was asked what was on the left side of my entry in challenge #61 Still life.
That is a Cokin P series filter holder with a 58mm adapter ring and a Hitech 0.6 soft edge graduated ND filter. I just got these and I'm still trying to learn how to use them on my S2IS. I knew these filters are made for the larger diameter slr lenses, but I thought I would try it on the S2 using the 58mm lens adapter. One problem I found out right away is that the 'soft edge' filter I bought is to big for the small diameter lens on the S2. The S2 lens is about 30mm in diameter and the soft edge portion of the filter that goes from full neutral density to clear is about 12mm. So I might end up getting the hard edge filter also... 
I bought these from BH Photo![]()
Cokin filter holder w/58mm adapter ring - B&H# COFHP5828
Hitech 0.6 Grad. ND filter - B&H # HIGND.6SCP
Here is how it looks on my S2 




