Does anyone out there have a P1 back for Contax for sale? I have a P20 now and need at least a P25 as I do more and more billboards and I'm also tired of losing my wide angle lenses with the square chip size. Also, I have had a lot of moire problems with textiles on my P20. Do people experience the same problems with the larger P25 chip? I've had to just about give up shooting fashion with my P20 and gone back to my Canon 1Ds.