steveheap wrote: I'm investigating Macro at the minute, so here is my explanation of why you may want to do this. A high aperture value - eg f22, causes a softening of the image in its own right. Because the physical size of the aperture is so small, the light around the edges gets bent, and so creates slightly blurred edges in the image. I think most lenses have their sharpest performance between f8 and f16. A second reason may be (and I'm not sure) that with a small aperture size you probably get a slightly less out of focus background which may be distracting.
With focus stacking, you are getting each part of the image in focus on its own, and combining those different areas in one image. The lens is performing at its best range, each piece is in focus (instead of being not visibly out of focus which is what depth of field means, I think) and the background has the blur associated with the wider aperture.
Screamin Scott wrote: Focus stacking involes using many images with minute changes in focus point & is fine for studio work, but is a bit impractical in the field. Using smaller apertures does have the effect of losing some sharpness due to diffraction, however, unless you are pixel peeping or making huge enlargements, you won't readily notice it .
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