I have a Panasonic Lumix GF1 with the kit 20mm f/1.7 lens. I put a UV filter on it (this one: http://www.amazon.com/gp/product/B00004ZCJE/ref=oss_product), simply as protection for the glass. I'm doing lots of theatrical shooting (bright lights, etc.) and I'm getting lots of lens flare in my shots. Here's an example: http://www.flickr.com/photos/schof/5006914162/
If I remove the filter, the flare goes away. Since I'm just using the filter to keep the lens glass clean and protected, is there another type of filter I should be using (or another brand of UV filter) to avoid this lens flare?