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- Name
- Toby
- Edit My Images
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I've always thought that perceived sharpness is due to the circle of confusion, and that the smaller the circle of confusion the sharper the perceived image. I've also known that stopping down a lens generally improves sharpness. However, I've just posted an example of how aperture affects depth of field and the CoC is the same at f2.8 than it is at f11 (0.03mm in the example below). Now I understand that the zone of focus is larger at f11 therefore overall the image will appear sharper as will have less sharpness fall off, but if the CoC is the same at f2.8 as f11 why can I see my images look sharper even at the point of critical sharpness when the lens is stopped down? I thought that it would be due to greater spherical aberrations with wider apertures, but then I thought aberrations (spherical aberrations at least) were related to the CoC.
As you can see, I'm a bit confused. Can anyone clear this up for me please?
As you can see, I'm a bit confused. Can anyone clear this up for me please?