> "Jim Arnott" <[EMAIL PROTECTED]> wrote:
> I have a 28-135 IS and am experimenting with large DOF.
> ... Also if you could, how about the 24mm lens.
Hi Jim,
You probably need a hyperfocal calculator. You could plug
the numbers for the 28-135 into my JavaScript calculator:
http://members.home.net/jul.loke
or the one on Photozone:
http://www.photozone.de/depth.htm
The relevant hyperfocal distances (IN FRONT of the lens):
28mm f/16 1.9m = 6'5"
24mm f/16 1.4m = 4'9"
Remember DOF is from half the hyperfocal distance to infinity.
So, focussing to 1.9m/6'5" with your lens at 28mm and f/16 will
theoretically give a DOF from 1m/3'3" in front of the lens to
infinity.
And if you focus the EF 24mm to 1.4m/4'9", f/16 will give DOF
from 0.7m in front of the lens to infinity.
Cheers
Julian Loke
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