Peter Fairweather wrote: > I might be wrong but doesn't the guide number go up ny the square root of two. > > If the GN is 30 at 100 !SO it is 40 at 200 ISO and 60 at 400 ISO > > > Peter > > > > > On 28/02/2008, P. J. Alling <[EMAIL PROTECTED]> wrote: >> Sorry that was a bit convoluted. Just remember the GN (in this case 22 >> in meters) depends on the ISO. GN doubles as the ISO doubles. >> This explanation is about as good as any other I've read: http://www.naturephotographers.net/articles0703/jm0703-1.html
-- Scott Loveless http://www.twosixteen.com/fivetoedsloth/ -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
