Just ordered two split screen focussing screens of the Nikon K3 type for my K5's from the Focussing Screen Company in Taiwan.
Focusing Screen
I am just not pleased with not being able to accurately focus under certain conditions and I am hoping that the micro prism and split screen can ameliorate the problem. I understand that the AF will not be affected. I just used to love the classic split screen confirmation. I just hope I do not have to replace the pad that the original Pentax focussing screen uses. Mr.Deki Kuo at focussingscreens.com told me that normally, I should not have to replace it. We shall see.