Re: Utterly off-topic: digital cameras

In message <kKeQteGHWE4EFwuW@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>
Michael J Davis <?.?@trustsof.demon.co.uk> wrote:

.... what you *show* is true only for the same (real) focal length for
both cameras, and ignores the fact that the final image is subject to
different magnifications. That means that there is a need to work to
different circles of confusion for different sensor sizes.

Indeed; I didn't introduce every factor that could have been mentioned.

The other factor is, of course, the fact that the better the lens, the
worse the *apparent* dof[1] because the fall off in sharpness is more
apparent.

Very true, though I think I hinted at that in my comment on fixed-focus
cameras.

God bless,
Kendall K. Down

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