A projector lens does not need a lens hood.
Well, one could think of stray projection light originating from within the lens and that should not stray into the room, but the stray light from the screen filling the room should be much worse.
(It would be the first lens hood too that I come across bearing the lens designation, but of course one cannot exclude such. And it even would make sense if that would be part of the lens and no accessory.)
But mechanically it would be a sound explanation. A lens hood put into a box designed for a screw-in zoom converter (after mounting that converter).
Last edited by AgX; 08-18-2013 at 10:40 AM. Click to view previous post history.