I cut an old Miranda split image focusing screen to fit a Pentax SF1N AF body. Was not all that hard, the SF1 has interchangeable screens, I think there are split image screens available on Ebay, I cut mine with a Dremel, you can use a split image for a Nikon F, Canon F, Minolta 9000, cut it to fit, I was worried that any difference in thickness would be a problem, I had no issues. Just be careful to mask the screen with tape so not to damage it when cutting to size.