Originally Posted By: siberia37
The simple explanation of diffraction is that as light rays go through a small hole some of them get "caught" on the edges of the hole and bend around them and distort. Wikipedia can give a more technical explanation. That's why the smaller the hole (e.g. higher f number) the more diffraction effects you get.

Oh! Of course!
See, I'm actually familiar with diffraction, but did not think of it this way: so, is the hole at such low aperture value THAT small? Wow.
I see it now and indeed it makes sense.
See, diffraction can well be caused by change in refraction index from one medium to the other on the path of the light ray, and I assumed something similar was happening, maybe coupled with some change in the path of the light inside the lens body. Well, all very great to know!
smile
Quote:

Not quite. Same aperture + same magnification + same image format = same DoF.

Got it. Thanks! smile
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