With the talk about the Toyo 45CF I went and relooked at the specs. The info from badger graphics claims

"Maximum bellows extension 14.04 (356.7mm)
Longest Lens with maximum bellows draw 400mm"

That doesn't make sense does it? Also how useful are extension boards? All I'd really like to use would be 300mm at the long end and 100mm at the short end.