Originally posted by C.W Tsorotes I personally still think there has been some minor hardware changes between the earlier models and later ones.
The difference in my unit between the old pcb and new lead me to think that the sensor wasn't the issue. Do the SLR's use A/D converters for the sensor to the processor?
I believe Pentax did have some hardware changes to make your K-7 perform better at high ISO.
However, I guess the only to find out is to find another K-7 which has never been sent back for repair to compare. If you really get a chance to get another K-7 to do some test, please do share the results with us.
Anyways, thanks for your information.