KarlG
Established
Same as this.Yes and no. If I am using my lenses somewhere a bit hostile to them like by the sea on a windy day with salt water spray in the air then yes I do. Otherwise no I don't as there is no need. As for protecting the front element of my lenses from accidental knocks, that is what lens hoods are for.😉
Generally, I don't use filters on any of my lenses. Not my RF lenses; not my Canon L primes (including the 85L, which has a ridiculously large front element).
Only exception is if I'm at the beach, as salt water is not my friend.