Well,regardless wether its 1/2 or 1/3, or 1 stop, it will still give better results
than i
got Sunday by not
switching WB from florecent-- to-- sunny. LOL Blue snow,what a concept.<vbg>
Great way to test a new camera eh. :-)
Dave(must remember to change WB)Brooks
> Alex Sarbu wrote:
>
> > Well... rating an ISO 100 film at ISO 80 doesn't
> > means 'overexposing by 1/5 stop ...
>
> Correct
>
> > ... but by 0.4.
>
> Wrong.
>
> The right value is log2(100/80), or 0.322 (approximately)
>
> > ISO 50 is 1 stop,
>
> Correct
>
> > ... and ISO 75 half stop lower than ISO100.
>
> Incorrect. ISO 75 is about 0.4 stops lower than ISO 100.
> Half a stop lower than ISO 100 is ISO (100/sqrt(2)), or roughly ISO 70
>
