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Posted by Martin Heffels on 02/10/07 13:34
On Fri, 09 Feb 2007 09:59:06 -0500, Rick Merrill
<rick0.merrill@NOSPAM.gmail.com> wrote:
>The 'subject' may change from 300 ft to 2 ft pretty quickly
>plus I' may or may not have a way to support the camcorder
>other than with my hands alone.
Don't worry too much. If you would have a focal length of 6mm (wide angle),
and an aperture of 5.6, then at 2 ft you are in-focus from 0.9ft -
infinity. If you're shooting during the day, you will have an even smaller
aperture and an even higher depth-of-field (this all assuming you have a
1/3" CCD).
You can work it all out for yourself at
http://www.panavision.co.nz/main/kbase/reference/calcFOVform.asp
And then you can pick your optimal numbers. If you focus on the
hyperfocal-distance, you will be in focus from the minimum calculated till
infinity. So, say in this example the hf is 1.9ft, min is 1.1 ft, max is
infinity.
cheers
-martin-
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