Thank you for your answer
I had seen this link. I allready have a rubber hood from Zeikos, but the it vignetts until 24 mm.
I wanted to know if anyone has experience with a hood bayonet made by third parties, such as Pearstone LHN-HB39 Dedicated Lens Hood HB-39 ($13 at BH). I have read few good reviews, but others not so favorable.
Mamiya has a nice collapsible rubber lens hood, if you're interested.
And it's not bayonet mount, it's a filter threaded mount so it'll work between your lenses too.
I haven't used it, but I guess it's good because it's not going to crack like a plastic hood might.