Originally posted by Christine Tham Please don't claim your unsubstantiated assertion as "fact."
Why not?
Things such as facts do exist. They are rare and difficult to prove. But do exist. And to the best of my knowledge, the before-mentioned "assertion"
is a fact. In modern times though, there is somebody for
every fact who denies it. So, facts may have become difficult to recognize.
This is where I try to help by calling facts what they are: facts. I don't do that often because, as I said, facts are rare. Because you like to challenge me: I will not provide prove that things I call fact are facts. So, it is my
opinion only that a fact is a fact. It is this opinion I wanted to share on this forum.
If you are interested to understand why I call it a fact, I am ready to do so by PM. But IMHO it shouldn't go into this thread.
BTW, your DoF calculator doesn't provide means of input for image diagonal or Zeiss constant. So, direct input of coc is the only other choice left. As such, your DoF calculator is very good. IMO though, an even better version would replace coc by input fields for image diagonal (or sensor dimensions) and Zeiss constant. By allowing the Zeiss constant to be input, you preserve all freedom your calculator currently offers.
Originally posted by Christine Tham In my "opinion", the CoC can also be constrained by factors such as lens resolution and pixel density
It can't.
But I think I understand what you try to say here. That what you define to be acceptable softness
near the focal plane depends on the sharpness
in the focal plane. This is a valid point when defining an images's potential for pixel-peeping and cropping and I do actually agree. But ... the corresponding measure is
not called coc and the resulting depth is
not called DoF. You need to invent new terms for what you try to express. Or otherwise, you create confusion and nothing else.
DoF (Depth of Field) expresses
one thing and
only one thing: The human eye's inability to perceive softness off the focal plane when watching an image from a distance allowing to perceive the entire image (the distance a human allowed to move chooses to watch an image, like in a gallery). You can't abuse DoF to mean something else you want to say. You need to give it its own name then.