DoF may not exist...

Started 3 months ago | Discussions thread
JimKasson
MOD JimKasson Forum Pro • Posts: 35,338
Re: DoF may not exist...

Erik Kaffehr wrote:

Now, we can see that f/2.8 yields acceptable sharpness from 206 to 208 cm, while f/11 yields acceptable sharpness from 2.035 to 2.08 m.But, maximum sharpness is reduced from 3500 cy/PH to around 1800 cy/PH when stopping down. That is due to diffraction. So, we gained depth of field while giving up on maximal sharpness.

With a CoC of 7 um, we get something similar from geometric optics:

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