What's OT's opinion on the Lenspen? I'll be going to a couple races in the next few weeks and the track can get dusty. Would the Lenspen be effective in brushing off the dust? Or should I get a B+W UV filter and maybe sacrifice a bit of quality. I don't want to ruin the front element on the new lens I just purchased It'll probably only be a little bit of dust so would it even affect image quality? If not, I could just clean it properly when I get home.