One thing to keep in mind Ruben is that to change aperture settings you have to pull out the collar aperture ring. I picked up a 33mm hood but it interferes when I want to change aperture. To remedy this I got a busted up 33mm filter from a camera junk store and removed the glass, as it was all scratched up, and use that as a spacer so that in conjunction with the hood.
Cheers,
Russ Pinchbeck