At 19:23 5/24/01, Garth Wood wrote:
John:
You could always post such images to a Web page, and then include a link
in your e-mail. Those who are interested can follow the link -- the rest
can ignore it at their leisure. ;-)
Garth
OK . . . here it is to view or ignore at your leisure (your choice). There
are three graphs on the following web page showing, for constant image
magnification:
1. How focal length affects DOF
2. How the circle of confusion grows behind the DOF for five focal lengths
in creating an "out of focus background."
3. How "field width" (perspective) changes behind subject and DOF for five
focal lengths.
The graphs were set up for 0.25X magnification, the threshold for macros,
an aperture of f/11, and a circle of confusion of 0.025mm, one of the
accepted standards for 35mm format film.
http://johnlind.tripod.com/lenses.html
Be patient; each of the three graphs is about 100k in size. Although I
created the graphs as "GIF's" I haven't been able to minimize their file
size yet.
-- John
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