Originally posted by WPRESTO I have a KatzEye on my K5, but I'm not convinced the registry of its focal point with the sensor is correct. I suspect it may be just as accurate to press the AF button and wait for the beep, and easier to tweak the focus point than finding appropriate shims for an out-of-register screen, and besides, SFAIK, the shims can only adjust in one direction (to front focus if I'm thinking correctly)
Why not put your K-5 on a tripod, disable AF, and draw a nice bold, straight line on a piece of paper or posterboard, and tape it to a wall with some low tack tape? Then just focus manually, until the line looks completely straight (you might even take a second camera with macro capabilities and photograph the viewfinder of your K-5), and then check the image in live view with punch-in magnification.
I have two Katzeyes now for my K20d and my K-3, neither one required shims, and they are perfectly in focus straight out of the box. Do I still miss focus sometimes? Yeah, my eyes aren't quite as sharp as they used to be. Adjusting the diopter helps, paying close attention to what I'm doing when I'm shooting helps even more.