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This may be of interest to someone here possibly
Arsat 30mm Ultra Wide Angle for Pentax 645, 645D, Mamiya 645, Contax 645 | eBay
Just noticed it on eBay, I'm nothing to do with the listing.
Just edited to add this line as I noticed the coincidence of a fisheye poll in the post immediately before this!
Last edited by Newmoon; 06-18-2012 at 12:23 PM.
Reason: Added last line.