Re: Sunny 16 Rule (digest 1539)

[P3D Bob Howard <bobh@xxxxxxxxxxxxxxxxxxxx>]

RE: Dave Worrell is amazed his Realist and the Sunny16 Rule did so well
with Wedding Pix! 

I think we talked Sunny16 some months ago and most agreed it worked. I
don't know if I mentioned then that the Sunny 16 rule is not just some
rule of thumb that fell out of a turnip truck, It was formulated by Jack
Tupper of Kodak Reaearch Labs from the equation of illumination (on a
film plane) which is buried somewhere in the 1938 Keith Henny HANDBOOK
of PHOTOGRAPHY by McGraw Hill. (Henny did the EE handbook too!, NOw
IEEE). The Sunny16 rule is my standard method to see if an exposure
meter is working. If they don't match it under standed condtions they
need adjustment. (Don't check you super matrix camera meter this way
though..they are a lookup table based on a sampling of the area of
several patterns) Also behind the lens meters are poor meters for
another camera if behind a zoom lens with unknown variable f/stops and
losses compensated for in the behind the lens reading. BobH
(For thos who say WHAT is SUNNY16? That is a standard exposure for any
film/camera between 10am-3pm with sun in clear sky at back (full
illumination on subject) and is: 1/ASA at f/16! (ASA=ISO/ASA film speed
used as the shutter speed.)


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