Originally posted by crussellsprout When you crop an image, you are changing the image format being used to capture or represent the image, so DOF changes because 'c' changes.
This comment shows that you are not understanding the most basic concept of the issue.
You are exactly correct... but with that it has no bearing on the initial post.
If you change things, things change. Pretty much a no-brainer!
Stop making it out to be more complex than it is. We're not cropping. we're not enlarging.
I have no idea where the concept of enlarging or cropping ever came in, except that FF zealots want to bring in "equivalence" to try to prove a point but they forget that it requires that some aspect needs to change. And that will of course change the results.
But AGAIN, that has NO relevance to the initial post.