From Large Format to Digital

[Joanna (Joanna Carter)]

@George

PhotoPhills Advanced dof calculator gives you the opportunity to overrule the standard CoC.

As does TrueDoF-Pro.

@George

About diffraction, thats supposed to become visible when the airy disk is twice the sensel size

Rubbish!

@George

As soon as you select another sensor size as your camera’s you get wrong figures. You just can’t use them

Total rubbish!!! it works for me as well as several of my photographic friends.

As for diffraction vs focus blur, the a look at my series of photos…

Wildlife workflow

You also need to look into diffraction on the sensor when you close down the aperture too much. I looked up your sensor and it has a pixel pitch of 4.38µm, which computes out to a minimum aperture, without diffraction, of f/5. But, since this is too limiting in a lot of cases, f/10 is an ideal compromise. Here is a series of shots at different apertures… f/5 [Capture d’écran 2024-03-13 à 17.50.49] f/8 [Capture d’écran 2024-03-13 à 17.50.55] f/11 [Capture d’écran 2024-03-13 à 17.50.59] …

The focus doesn’t change, the DoF does change obviously and, as the aperture shrinks, beyond the diffraction limit, diffraction becomes more and more obvious.