hehehehehehehehehehehehehehe (I'm still laughing)
Cotty escreveu:
On 6/4/09, Bob W, discombobulated, unleashed:
To calculate the nearest (dn) and furthest (df) points in focus use the
following formulae:
dn = U * F^2 / [F^2 + (U * c * f)]
df = U * F^2 / [F^2 - (U * c * f)]
where
c = circle of confusion
U = subject distance
F = focal length
f = f-number
To calculate the circle of confusion
c = (v * D) / (1000 * S)
where
v = film format / image size
D = viewing distance
S = print size
Source: The Professional Guide to Photo Data, 3rd edition, by Richard Platt.
Very easy with a spreadsheet.
* F . u (2) - 'no*vv Pi55 o'.ff
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Cheers,
Cotty
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Luiz Felipe
luiz.felipe at techmit.com.br
http://techmit.com.br/luizfelipe/
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