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Every SLR I have (film and digital) has it. The only cameras I have that don't have it are rangefinders. On those, I mostly just make educated guesses on how far the DoF will extend.Do cameras even have a DOF preview anymore? I used this feature extensively when I was shooting film and now that I shoot stopdown.
Certainly the higher end models do, right?
Yes. But. How much different and how does the DoF distribution change.I just know intuitively that a larger f/stop (f/2.8) will yield a shallow DOF and a smaller f/stop (f/16) will yield a longer DOF.
I think it's a very common amateur mistake to consider DoF only in terms of lens aperture, ignoring the several other factors that affect DoF, particularly the focus point distance.
When I shoot, I am always keenly aware of my focus point distance relative to the lens focal length and aperture I am using.