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

Started Apr 8, 2013 | Discussions thread
OldClicker Senior Member • Posts: 2,322
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.  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.

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

Most important? Not necessarily.  Most perceptible, probably.  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.

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

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

DoF is perception.  Anything that changes the 'perceived' sharpness changes the DoF.

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