XP1 lens hoods and 39-52 step up?
I use a vented hood and the step up from 39 - 52mm. I just bought a cheap UV filter and knocked out the glass so it could reach the threads. I just leave the step up on so I can just use the same caps and vented hood as I do on the other lenses.
Edit: Almost forgot to add, you don't always have to knock out the glass on filters. Many have a threaded ring or a clip that you can unscrew or remove and just pop the glass out.