Sunny-16 Rule

[P3D Adrian McCarthy <Adrian_McCarthy@xxxxxxxxxx>]

The "Sunny-16" rule that people have been quoting seems wrong to 
me.  I just returned from Hawaii (poor me) where I shot 15 rolls 
with my "flat" SLR and my twin SLR rig.  On sunny, cloudless 
days I was shooting Sensia 100 (slides) at f/16 at 1/30 to 1/60 
second. In other words, I needed roughly one to two stops more 
light that the Sunny-16 rule.

With the polarizers on, I resorted to 1/15 s and hoped that I 
could hold the monopod steady enough.  I bracket my exposures, 
but for nearly all these pix, the meters seemed right on -- 
awesome color saturation and little to no burn-out on the 
highlights.

I checked my notes from a photography class I took.  According 
to those, the "1/film-speed" rule applies to slides around f/8, 
two stops more light than Sunny-16.

My first guess was that Sunny-16 is intended for print film, but 
the discrepancy is in the wrong direction.  What's the scoop?

Aid.


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