Originally posted by enoeske I only have a K-5, so i can't compare. The reason I specify the K-5iis is due to the lack of AA filter in both.
I think that using k-1 in crop mode will give you the same good results (low amount of noise) as shooting in FF mode. Because the quality of that noise is different compared to that produced by K-5iis. Using crop mode on k-1 you simply cut-off the part of sensor pixels. This don't change the quality of picture in aspect of noise. On the other hand k-1 sensor produces very low chroma noise compared to k-5ii at high ISO.
Maybe 1 week later i will try to post pictures made with k-1 in crop mode and witk k-5ii