The HartBlei Cam (disclosure: we are dealers) allow the use of a 17mm on a P65+ (full frame 645) with a mm or two of movement. I've not personally used this combo (though I have used the HartBlei cam) and the
LL review says the corners are not great (not a shock given it's utterly extreme wideness)
17mm on a P65+ is the same as an 11mm lens on a FF dSLR with a small bit of room for movements (especially if your subject is not filling the frame in the horizontal direction).
That's the widest rectilinear lens I know of (probably isn't the widest in existence so please jump in if you know of wider).
Doug Peterson
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