If this UV filter is for protecting the lens then i wouldn't do it, i would just keep the lens cap on up until 5 seconds before you snap the pic then put it back on. if youre filming upclose skiing/skateboarding then this investment may be short-lived.
Take care and keep both eyes open because the distance from a fisheye is deceiving through the viewfinder. (if you're gunna hold it away from your face... well then.... dont listen to me)