Quote Originally Posted by neuroanatomist View Post
@Rocco - you may be falling into the common trap of looking at images at 100% for comparison. That's why lots of people complain that their new 7D sucks because it's so much noisier than their old 40D. An 18 MP image from the 7D does look noisier than the 40D's 10 MP image when both are viewed at 100% - you're viewing a much smaller area of the 7D's image. To compare fairly, downsample the higher res image - the 18 MP image, downsampled to 10 MP, looks cleaner than the 40D. So...what does a 36 MP D800 image downsampled to 21 MP look like
Ahhh! I'm so confused! If you took two identically framed images, one 18mp and one 10mp, did a 100% crop on both.. wouldn't you be looking at the same area of the image? And how does down sizing an image from 18 to 10 reduce the noise? I mean.. obviously less pixels= less noise. But isn't that just because there are less pixels to become noisy? Also, how do you go about down sampling images?

When zooming in on those sample images, is that really a 100% crop?

I trust that you know a thing or two. Help me understand? I'm obviously missing something. (And my head hurts trying to make sense of it now. It was so cut and dry for me last night. Heh.)