I've spoken a lot about the wonderful equipment I have been given. Well, when people stopped giving me stuff I found I started to go out and buy it --GAS attack! This time it's a Busch Bis-Telar Series II F7 400mm lens. It has some issues but looks entirely serviceable. I searched both the Vade Mecum and the internet for info on this beast, but I've found only a little. The 400 is only mentioned in posts by one photographer, who has been sent an email. The Vade Mecum has a 340mm but that's the closest thing listed. The F stops actually start at 6 and proceed 12, 24, 48, 96, 192, 384. The seller also had an 11x14 Seneca that seems to have marks that may indicate this lens was mounted on it (unusually large flange adapter and 4 screw holes.) Is there a chance that this will cover 11x14? I know... the first logical response is "try it!" Unfortunately, I don't have an 11x14 camera (Down, you demons! No more gear!!!) Any other sage advice? Words of wisdom and experience? Thanks, as always, in advance.