Ok, I've had it with "focusingscreens.com". The one for the K-50 did work fine, but the one for the K-1 has incorrect dimensions - it can't go into the tray properly since the holding tab is located too far to the center and interferes with the metal lip on the tray - guaranteeing distortion - could not be adjusted front-to-back, in part because the little plastic "shims" supplied came in a warped condition which did not relax over time, even under pressure. No telling what sizes they are, either. They don't tell you up front that these things aren't really made for Pentax cameras (a violation of consumer protection laws where I live), indeed, they don't make them at all. As @Stevebrot confirms, they're made by Canon and apparently purchased by the FocusingScreen people and cut down (in this case, rather badly). So one of them was fine, the other was a disaster; and the question I then pose to the assembled multitude is this: you want to risk a hundred bucks on a fifty-fifty chance it might work in your camera?
Originally posted by pschlute One thing you could try is to use the AF/FA menu to adjust the focus to compensate for that backfocus **....
Thanks, but this issue has nothing to do with autofocus; manual focus can only be calibrated by mechanical adjustments.