I have had this discussions too many times with people. I am of the belief that either use a high quality filter or use nothing.
Originally posted on Photofocus:
A while back I wrote a post called The Problem With Using Filters On Your Camera Lenses.
There were several discussions on Google+ about the post with several people contacting me to assure me that they had been saved by a UV filter and that unrecoverable harm would have been done to their lens without the protection of a filter, etc., etc., etc. As I said in the original post, in decades of photography this hasn’t been a problem for me, but apparently there are a rash of front-element-seeking projectiles out there just randomly “destroying” people’s lenses. Or maybe many of them work at camera store counters and have an agenda!