Sounds right. Lousy physics, but who cares when discussing
the TRUTH <g>
"Bill D. Casselberry" wrote:
>
>
> Albano wrote:
>
> > > Somebody knows if ALL cameras and ALL incident meters are calibrated for 13
> > > percent? All Asahi cameras or just modern ones? All meters? Gossen?
>
> The real reason for this discrepancy is that way back during
> the Anselian Age the Sun actually shone brighter than it does
> today, thus the "average scene" back in those idyllic times
> did truly measure an 18% reflectance. Some speculate that the
> increased industrialization and concurrent smog (obeying Boyle's
> Law and dispersing evenly throughout the atmospheric envelope)
> density has reduced this reflectance to a mere 13% in recent times.
>
> Friday looming large on the Oregon Coast ..... Bill
>
> ---------------------------------------------------------
> Bill D. Casselberry ; Photography on the Oregon Coast
>
> http://www.orednet.org/~bcasselb
> [EMAIL PROTECTED]
> ---------------------------------------------------------
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