Accurately comparing FF vs APS-C sensor performance? An open discussion.

Started Apr 8, 2013 | Discussions thread
Klipsen Veteran Member • Posts: 6,150
Re: You misunderstand

VirtualMirage wrote:

Klipsen wrote:

I  put the ~ there, because you can't have the same number of pixels and the same pixel size on the two formats, and both have an influence on the perceived DoF.

Pixel size doesn't matter when it comes to measuring DoF.

But it does. Just like grain size did in film. It's all about sharpness.

The sensor can be 12MP, 16MP, 24MP, or even 100MP, Dof will be the same.  But you are right that it makes it more or less perceptible, but it doesn't change DoF.

There is one - and only one - plane of focus. DoF is the perception of sharpness, where there is actually a slight unsharpness.

Actually, it's at shorter distances and wide apertures that the relative differences are most important.

Most important? Not necessarily.  Most perceptible, probably.

Let's say 'greatest', then, because DoF increases enormously with increase in distance and stopping down. You might want to read about the 'hyperfocal distance' - not just what it is, but also its relation with DoF.

But it doesn't hide the fact that there is a difference in DoF due to a difference in the size of circle of confusion with each sensor size.

Well, you got that one right. But you're wrong if you think the diameter of the circle of confusion is carved in stone.

You are stating perception, I am stating the technical side.

Oh, come on!

Perception is .9 inches and 1.0 inch are the same, but technically they are not.  And while from afar that won't make much of a perceptual difference, it becomes more noticeable the closer you get.

Actually, DoF also depends very much on the viewing distance.

Maybe I should have posted my examples in inches instead? Or perhaps cm or mm?

What difference would that make? But don't let me stop you.

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