I don't, but it looks interesting. Do you have a link?
Yes I do.
( I don't have any connection to the seller of course, other than I bought one of the things. )
http://www.ebay.ca/itm/Lens-hood-Sh...583?pt=LH_DefaultDomain_0&hash=item3ccdb95f3f
Of course, I can't see what good the venting does other than to make it look cool. The oblique angle that the lens presents when you're looking through the finder isn't helped much if any by the venting.
G
There is a ridge around the inside of the hood positioned in front of the lens. There are no threads but something could be captured, so perhaps.Very aerodynamic. It'll also hold the Series filters in, too?
Actually the venting makes sense, if the hood intrudes into the frame.