oh if you just got here you missed the good part...
I'll start over:
Several months ago, after picking up two K-r bodies, I remembered just what using a penta-mirror viewfinder was like. (Hint: not good.) I sought options that would enable me to see well enough to focus manually, as at the time I owned several manual primes. This was also the time when KatzEye bright focusing screens disappeared as the company dealt with financial issues, so the best-known option was unavailable.
So off I went to the search engines, seeking bargain alternatives. I found a mystery auction dealer that sold one-fits-all Pentax screens for under $20 and ordered a split screen fresnel collared screen. It took a while to get here but i jumped in when it reached me.
only to find it didn't fit!
The screen was labeled for K-7 only but I was pretty sure it was not so exclusive. The K-r swap was new to me though, and clearly it wasn't working - so I sought to return the screen for a refund.
only I never sent it back!
So here's where you came in: today I remembered it had not left my shelf. I still have several manual focus lenses.. but now a K-s1 body makes use of them. Could it be possible that the old cheap screen would fit the new camera?
yes it can.
So now the K-s1 has focus peaking And a more precise focus screen. Test images show that it aligns just fine.
Overkill perhaps, but the screen is here anyway.. so why not?