Hello!
I'm moving into LF from MF - I'm considering this lens for general urban documentary work including landscape and portraiture (I'm talking environmental portraits - not head and shoulders).
I'm aware of the theory that generally LF lenses are not designed to be used wide open. However as I'm going to use the lens in conjunction with the Fotoman 45PS, being able to shoot wide open would be a big advantage in low light where a tripod is not possible.
I would like to hear your opinions on using this lens wide open.
I'm also interested to hear about other lenses which may be sharper and generally perform very well wide open - considering apertures of 4.5 or 5.6 - focal length 90-180mm.
There is a compatibility list of lenses for the 45PS here:

http://www.fotomancamera.com/prodect_list.asp?id=190

I'm sorry if this is an old question - I searched the forum but couldn't find anything relevant.

Thankyou!