The application sounds REAL specialized... Almost like some sort of object recognition thing, but hand-held on the fly rather than like a fixed factory automation setup? Do you want the individual disks to more or less fill the frame? Or are you sorting out a bunch of disks? The killer is the 45 degrees while maintaining DOF. Best thing would be if you had a LOT of light, think maybe electronic flash. Would really need to know more about the applicatrion, and do some head scratching. You may be into the world of swings and tilts. Is this done today with film cameras, and you are just looking to change to digital?