This is not a matter, Pentax say that new KP are better in compatibility, than previous ones of their digital cameras, also with lens from K-1000
Sigma still working very well from Pentax K10 to 7. In K3 and K3 IIs, works, but in manual focus and some troubles.
KP make existential electronic crisis, as short circuit, why? Is impossible to use then, without cover with plastic tape, the backside of his bayonet.
Unbelievable that focus peaks not works, when video are running. More worse, the definition of the screen turn blurred, limiting the possibility to follow subjects by manual focus. This is truly horrible for any modern camera and his price...
Peaking focus in digital technology, when cameras offer Live View and Video, are indispensable...
I use it, also from the time of Videotapes old cameras as Betacam, for example... There have not excuses, also cellphones and compact cameras doing it...
Here, the forum seems as Chorus Line of Pentax...