If you have the last pentax digital utilities, you CAN save in Pef
Better 10% and minus size to DNG.
Tips:
get your picture in your KR-K5 in Pef
Run Pentax Digital Utilites 4.30
Download your Pef
Now You Must Be found (sorry me i have one KX and not again one K5)
one option named "Convert To DNG", you apply and enjoy, you have so
the your raw in DNG for working at this day...
Ps I Say Get your picture in Pef, so because DNG to PEF is Impossible.
I'll try Dowload PEF KR/K5 in PEF in my version 4.21, but not convert/modify picture possible..
And it's not possible help you best/better beceause i HAVE NOT (and asked here...)
the version 4.30, one user must put one ZIP of his New version...in/on rapidshare, Megaupload, etc...
For check...but nobody make this sniff...
Best Regards Jpette