Re: Joe Feldman sunny-16 (digest 1592)

[P3D Bob Howard <bobh@xxxxxxxxxxxxxxxxxxxx>]

RE: Joe says he is having exposure problems shooting at 1/50th @ f/6.7!
Going to try Sunny-16 rule next and wonmders what all the meter numbers
mean?

Well Joe, I presume you meant 1/50 f/6.3? Unless you are astute enough
to conert 1/60 f/6.3 to 1/50 f/6.7??? The former is the standard Leica
exposure for Kodachrome and the latter is a good adjuxtment for 1/50th.
BUT in either case THIS IS FOR WESTON 8/ASA10 KODACHOME OF 1945-50 ERA.
You would get such from the exposrue table in the Realist lens cover for
example. It is better to use the Sunny 16 rule and its offsets than a
meter because you will then THINK!
The Sunny 16 rule says: Any film is correctly exposure at 1/ASA @ f/16
for a clear day between 10am-3pm with sun at your back (front lit
subject). ASA being the ISO/ASA film speed used as the shutter speed.
The offsets are those found on the paper calculator of Kodak or the
exposrue sheets. e.g. cloudy-bright one stop more, dull two stops more,
open shade three stops more. Sun with side light one stop more, sun with
backlight two stops more. One determined for f/16 and offsets you can
convert to more covenient f/stop or shutter speed as f/stops and speeds
are same increment if you shift two stops higher number then lower
shutter speed two positions lower, etc.
A light meter will read pehaps a light value or other number, when the
dial arrow of the meter is set to this reading all the equivalent
f/stops and shutter speeds are lined up. Choose any pair. The Sunny 16
rule is good as we want max depth of field in stereo so can be left on
f/16 until light forces a change. BobH


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