With the shortest ever back-focus register distance for an interchangeable lens camera system on Earth, Pentax has made another big achievement with the assistance of Japanese accessory maker Rayqual, whom has made many Q-mount adaptors for various different lenses from C/D-mount to FD and then also one for K lenses of Pentax themselves:-
http://homepage2.nifty.com/rayqual/PTX_Q.html
via 1001 Noisy Cameras.
The prices are 16380 Japanese Yens (now about US$210) for normal SLR mounts and US$162 for the C or D mount adaptors.
So, my congrats to Pentax again, for this big success (that no-one has achieved before!) this time! The 5.5X super multiplier is yet another "the world-first" and "biggest", no matter what and after all! ;-D
Further Reference Read:-
Camera Mounts & Registers (Wikipedia)
Read Also:-
When the Sensor Outresolves the Lens..
More K-to-Q Adaptor Product Images
Leaked Pentax Marketing Q&As in the P-Q Pre-Release Press Conference
The World First / Pentax First: My (Obsolete) Pentax Collection