--- Lars Michael <[EMAIL PROTECTED]> wrote:
> So, are you saying that you can make a subject
> appear in
> focus on print if it is not in focus on the
> negative,
> simply by changing the print size?
>
> What is in focus on the neg is in focus, and what's
> not
> that's not. Print away all you want, there's no
> way
> around it. Of course for large enlargements you
> obviously
> also have to enlarge the grain, so you loose
> tonality,
> but that has nothing to do with the DOF during
> exposure.
No, this is not true. Your eyes have a certain
resolution which is about 1/60 degree (I think) at its
maximum performance. Whatever is smaller then that
your eyes cannot resolve anymore. That is why you have
DOF. If your eyes could resolve everything then there
would be no DOF!! Basically, if you go out of the
focal plane your dots are becoming circles. But
because your eye has only a certain resolution it sees
the cirles as a dot. Now if you enlarge your images
you also enlarge the circle. So if you look at the
bigger image from the same viewing distance then you
will see some of the circles that before it appear as
dots. Therefore, you decrease DOF because you enlarged
the image but did not increase the viewing distance.
You can also look at it in another way. If the
enlargement wouldn't matter then you could see the DOF
of the final print in the viewfinder. Also you would
not need a lupe and even less lupes with different
magnifications to judge sharpness.
Robert
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