I've always been a true believer of protective filters. I know there are some that don't believe in them. I was on an ATV with my Hasselblad one day and I opened my case when I stopped and saw glass all over the bottom of my bag. Apparently the lens cap came off and it banged up against something and shattered the filter. That just reinforced my use of filters. I'd rather break a $50 filter (it was a deep red filter) than a $2200 (at the time) lens.