DoF may not exist...

Started 3 months ago | Discussions thread
Erik Kaffehr
OP Erik Kaffehr Veteran Member • Posts: 6,177
Another approach...

We can see that mst good lenses reach optimum sharpness at f/4. The only factor reducing sharpness when stopping down is diffraction.

The airy radius is 1.22 * N * Lambda. Assuming Lambda being 0.55 micron, we would get the airy radius where diffraction cames into role to be 1.22 * 4 * 0.55 -> 2.7 microns.

The corresponding diameter is 5.4 microns.

So, it may make some sense to use around 5-6 microns as CoC good lenses at optimal aperture.

But, that would yield a pretty short DoF.

Best regards

Erik

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Erik Kaffehr
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