Out of curiosity - the compendium hoods sold by Shen Hao, Toyo etc, anyone have any specs on those - in particular how large is the opening that fits over the lens. I'm wondering if there is anything out there big enough to fit over the Schneider XLs with center filters attached (112mm).

I spoke to someone at Lee who indicated they have a nifty slip-on attachment specifically to fit their wide angle compendium hood on to the Schneider 90/72 XLs. I like that idea. It's fairly simple. The limtation is it only works with those lenses without the gigantic center filters on. They don't make a hood large enough to fit over those 112mm center filters. Still better than nothing though.