I am on the cusp of buying a new Olympus SP-590UZ. The Olympus web site says there are no filter threads on this lens. However, there are after-market adapters available for filters. I suppose this means using a invisible lens cap (UV filter) is ruled out. Also, does this mean that, if using the adapter, the shades cannot be used? That would be bad news for me as I am a huge believer that good shades are critical to sharp photos. I'm mainly interested in being able to use a circular pola filter but also want to use a shade at same time. Anybody have experience with this? The web site descriptions are not very helpful.