Quote Originally Posted by mudman View Post
i am reading an article about the K1-2, which says that the frame rate increases if the camera is switched from full frame to crop mode
....
is my understanding correct?
Yep!.

According to the specs, 4.4fps in full frame mode, 6.4fps in APS-C crop mode.
The reason will be the buffer fill/write rate.

Full frame mode has more data per images(eg. 70-90MB / image), APS-C mode more likely to be 25-30ish MB / image .. so for every 6.4 APS-C images per second, you have less total Mb to write to the card every second.

One thing I like about Pentax .. is their philosophy that the customer is king!
You can update you K1(series 1 model) to a K2-II model for a reasonable sounding fee(I think about $500 or so).
It takes a while to do, as they change physical bits internally AND subsequently label your series 1 model as a -II model too.

A very cheap update