While I was out on my last shoot, I did a quick test to show the effects of diffraction on image sharpness. If you don’t know what diffraction is, here is the dictionary definition:
Diffraction is the process by which a beam of light spreads out after passing through a narrow hole or across an edge.
Practically what this means is that when you use physically smaller apertures, the light passing through the lens spreads out more.
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