RE: How to calculate depth of field?

[Jason Revell <jason.revell@xxxxxxxxx>]

The calculations you require are as follows;

Nearest point of focus = Ux(FxF)/((UxCxf)+FxF)

Farthest point of focus = Ux(FxF)/(UxCxf)-(FxF)

U = Subject distance

F = Focal length of the lens

C = Circle of Confussion (acceptable sharpness which their is a calculation
for as well if your interested)

f = f-number

There is also one "rough and ready" one if you know the Hyperfocal distance
of your lens aswell which is much easier to use in the field.

Hope this helps,

Jason Revell
jason.revell@xxxxxxxxx


-----Original Message-----
From: Steven Lam [mailto:slam@xxxxxxxxxxxxx]
Sent: 03 July 2000 04:14
To: infrared
Subject: OT?: How to calculate depth of field?


Hi all,

    Sorry for this off topic question but, just wondering if anyone knows
how to calculate the depth of field for a particular focal length and
f-stop?  I've found a lot of 'rules-of-thumb' for calculating depth-of-field
from infinity, but I wanted to figure out what would be in focus if I
focused at a particular distance.

LMK?
Thanks,
S.Lam

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