Re: Depth of field preview

[P3D Dr. George A. Themelis <DrT-3d@xxxxxxxxxxxxxxxxxxxxxxxxxxx>]

Paul Talbot writes:

>DOF preview is more a mechanical action, stopping down the
>lens to the taking aperture  [...].  In the
>viewfinder the image becomes darker, but with more of it in focus,
> both of course due to the now reduced viewing aperture.

This darkening of the image makes it hard to judge the DOF.
The author of the book about focus that we discussed recently
mentioned a couple of other reasons that the DOF preview will
not give accuarge DOF information.

-- George Themelis


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