RE: Image sharpness and focus distance

[Alan Zinn <azinn@xxxxxxxxxx>]

At 05:50 AM 10/25/2000 -0700, you wrote:
>The following is cut&pasted from a FAQ on
>www.graflex.org (a great site for lens info):
>
>"When a lens is defocused, a point in the subject gets
>rendered as a small circle, called the circle of
>confusion. If the circle of confusion is small enough,
>the image will look sharp. There is no one circle
>"small enough" for all circumstances, but rather it
>depends on how much the image will be enlarged, the
>quality of the rest of the system, and even the
>subject. Nevertheless, for 35mm work c=.03mm is
>generally agreed on as the diameter of the acceptable
>circle of confusion. Another rule of thumb is c=1/1730
>of the diagonal of the frame, which comes to .025mm
>for 35mm film. (Zeiss and Sinar are known to be
>consistent with this rule.)"



>Based on all the responses so far, the areas in a
>panoramic image that the lens is not exactly focused
>on are sharp, fuzzy, blurred, out of focus, and
>stretched or compressed, all depending upon the viewer
>and the subject: phew! <g>
>
>Andy
>

Andy,

HA! You gotta believe!!!

AZ


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