This lens had to be hand-held against the hood mount as I had no adaptor sized quite to fit it (estimated 58mm), thus the finger in the frame. However as you can tell from closer examination, this was no great loss as the edge quality is horrible almost to the center of the frame. So, while it does generate a very large image circle indeed, this lens would likely not be worth pursuing,

The weight and size are tolerable though if the lens could be produced with a decent image (although by tolerable I mean a TC that weighs as much as the DP-1 and is almost as large).