Originally posted by KxBlaze This question was asked a while back and another member posted 100% crops of ISO 100 and 200 of a blue sky. He did not say which photo was 100 and which was 200 but instead asked if we could tell and everyone that responded could tell that the 100 has noticeably less noise than the 200. Now to some this is not a big deal because most people do not zoom to 100% in normal use but to others it's a big deal. Try searching for that thread, it surprised me that I could actually see a difference.
OK now I'm confused -
unfortunately I could not find that thread using various search term variations.
I could understand er1kksen saying one may see this in post processing (RAW?)
but will not see the difference when converted to JPGs - and since we all look at JPGs -
that's the reason I could not see much difference from all those 100% crops of test images from dpReview and Imaging-Resource.
However what you are saying is that someone demonstrated this with what had to be JPGs with a plain blue sky.
Now there are plenty of examples of plain blue areas in the DPR and IR test images, and I could not see much difference in the noise - again I am quite willing to say I may not be looking at the right places - but I also have been studying K-x images for quite a while, and so far none of the 100% crop or full sized images show much difference to me.
Here are 100% crops of all the Blue Patches from the Imaging-Resource.com full sized
Multi Target
There probably are measurable differences - but I am not seeing that much difference visually even with these 100% crops from the full-sized test images.