Hi! To complement my OM-D with the kit lens, I'm about to buy the Panasonic 20mm, and some filters. I've got a few questions: - I plan on getting the "old" version of the 20mm. I read the newer version is just a cosmetic upgrade? - I want to get a polarizing filter, and a Neutral Density filter. (possibly this kit: Tiffen 52mm Digital Essentials Filter Kit 52DIGEK3 B&H Photo) -- Will the ND filter allow me to experiment with pictures that make water supersmooth when I put my camera up on a tripod? -- What's the use of the UV filter, aside from protection? -- This 52mm, will it fit my 12-50mm OM-D kit lens? I noticed the lens has wire on the inside... -- I'll probably want to mount this filterkit to my soon-to-be 20mm as well. It's filter thread is 46mm. Do I need to buy the filter kit in 46mm or 52mm and which step-down or step-up ring should I get? Thanks so much!