Below is a crop of an image viewed at 100% showing focus of a 90 Apo-Asph at F4. True, it is not wide open, but I think it shows what the camera can do, once the vertical rf is tweaked. BTW-I got a Nikon DG-2 and slapped it on the viewfinder. It showed that no further adjustments were needed. The camera was hand-held, distance was about two meters, I think the ISO was set to 400 and the various settings were all at their factory defaults. The image was shot in BW/Jpg-Hi mode -- I actually forgot to strip out the RGB information before posting, which would have made for a smaller file.