The Pentax website claims that in-camera noise reduction can be set to start at iso 3200.
"The intensity of the high-sensitivity noise reduction can be selected from three levels — weak, medium and strong — while the minimum sensitivity can be set to any level from ISO 200 to ISO 3200."
Taken from
K-7 : Digital SLR Cameras : PENTAX
But, mine allows it from 200-1600. So, I don't use it as I want it to start form 3200. can someone check and tell me whether they have 3200 as the minimum starting point.
P.S: Wrong forum.