At 09:34 PM 8/30/1999 -0700, you wrote:
>At 08:22 PM 30-08-99 -0500, Joel Wilcox <jowilcox@xxxxxxxxxxxxxxxxxxx> wrote:
>
>>On a clear, sunny day, probably between about 10 AM and 3 PM, exposure
>>required should be f16 + 1/ASA of your film (roughly). E.g., Velvia would
>>= 1/60 @f16, Provia = 1/125 @16.
>>
>>Exceptions to Sunny 16 are bright snow and bright sand, which creates "more
>>light" through reflection, etc. F22 + 1/ASA is the rule in these
>>situations. Your meter will tell you to stop down to F32 (or equivalent).
>
>The sunny 16 rule surely is based upon an incident light reading. A
>reflected light reading off bright snow or sand would result in an
>approximate one and a half to two stop under exposure as compared to the
>sunny 16 rule.
>
>I disagree that f22 @ 1/ASA is appropriate. This would result in an almost
>two stop underexposure resulting in the brightly illuminated snow looking
>very grey. I have always opened up two stops from the reflected readings in
>bright snow conditions and have always had properly exposed photos.
>
>jh
>
I should have said where bright sand or snow is part of the scene and not
implied I meant direct shots solely of bright sand or snow. The point is
how those elements increase light in the overall scene, not how reflective
they are in themselves.
The Sunny 16 "rule" is the basis for the guidelines printed on the film
boxes. I'm not trying to describe something that will explain everyone's
experiences under every set of conditions. If in one climate, conditions
vary from the Sunny 16 "standard", the variance can be factored in and the
rule still be useful. If someone does not find it useful, one need not use
it. I certainly ignore it almost entirely when I use a spot meter. In my
case I also found that the Sunny 16 rule was a lot more meaningful when I
discovered that my ASA dial was off by one stop. I calibrated this by
shooting slide film of a setting with the meter reading dead level. Then I
shot brackets using the ASA dial to change the speed. Once I had done this
and observed the results and recalibrated ASA on the dial for that film, I
was able to get meter readings which were far more consistent with
expectations derived from Sunny 16 guidelines. YMMV.
Joel Wilcox
Iowa City, Iowa USA
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