EXIF Brightness Value (what is it)

Started Jul 28, 2008 | Discussions thread
ej64 Regular Member • Posts: 226
no, your Fuji is right

read the above posted wiki-link.

Bv = log2 (A² T/Sx/N)

A= Aperture, here 6.7
T= Time in s
Sx= ISO speed
N= konst. ~ 0.30

=> Bv = log2 (6.7² 4.5/200/0.3) = log2 (0.166) = -2.588

For you can't compute a base 2 logarithm on most calculators, you can use a simple base change:

log2 (0.166) = ( log (0.166) ) / ( log (2) )
--
best regards
Eberhard
my site: http://www.ej64.de -- galleries, blog (german) and other stuff

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