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Re: Calibrating film (was [OM] 357 batteries vs substitutes)

Subject: Re: Calibrating film (was [OM] 357 batteries vs substitutes)
From: duncanm@xxxxxxxxxxxxxxxxxxx
Date: Tue, 2 Jun 1998 12:20:43 +1000
This is all getting too technical again,

#engage rant

    The best way to calibrate your meter for slide film is to shoot a
subject at different exposures and then pick the slide you think
is the best.... full stop. This will depend on whether you're
projecting it, scanning it, looking at it on a light table, or whatever.
(eg: you may like velvia at EI40).

    Once you;ve found an AI on one camera body that you like,
repeat for different bodies to get the same exposure as the first.

    For print film, where you have little control over what
the lab will do, 1/2 a stop doesn't really matter (though over
exposure never goes astray).

   For B+W, since the final output will be a print, you should calibrate
your whole exposure/developing/exposure/printing system to give
you base+fog whites and as many film stops as you want to fit in
to Dmax paper black.

as always, imho.

     duncan






fdayrit@xxxxxxx on 02/06/98 09:58:12

Please respond to olympus@xxxxxxxxxxxxxxx

To:   olympus@xxxxxxxxxxxxxxx
cc:    (bcc: Duncan McRae/QSA/AU)
Subject:  Re: [OM] 357 batteries vs substitutes




i can only agree with this. have been considering getting a densitometer
that
will not only help with variability between my different camera bodies but
even
between different types of film. problem is that the affordable
densitometers
that are available are basically for black and white film and not for
slides. i
still haven't looked deeply into calibrating for tansparancies. my om4T for
example is set at 50 when i use agfa 25 professional black and white film.
this
is all best done using the zone system as described by Fred Picker.  but
even
here there is a need for a densitometer to determine which exposure will
produce
zone 1 consistently which is defined as a density of 0.08 to 0.1 above film
base
plus fog. i have found the book of Picker(zone VI workshop) and that of
Davis
(Beyond the Zone system) to be complimentary to each other.
francis




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