> Pierre Bellavance <[EMAIL PROTECTED]> wrote:
> Your calculator looks impressive, but are there instructions for
> its use?
Hi Pierre,
There are no instructions yet. You can change the numbers in the
boxes to suit your lens (e.g. 35mm format, 0.025mm CoC, focal
length 400mm and close focus 1.8m)
You "focus" the lens by changing the Working distance (So), and
the calculator shows the magnifications, field of view, hyperfocal
distances and DOF table below. If you need an aperture value that
is not in the DOF table, you can choose it in place of f/1.0
You can also "attach" a diopter from the list box (e.g. 500D is
a +2 diopter; 250D is a +4 diopter; and a reversed 50mm is a +20
diopter) to see what it does to the focussing range, DOF and
magnification.
You can also see what happens if you add a non-Canon teleconvertor.
E.g. 1.4x or 2x
Have fun
Cheers
Julian Loke
P.S. Since this is getting a bit off-topic, send follow ups by private
mail please to mailto:[EMAIL PROTECTED]
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