In a message dated 4/29/2005 6:48:18 PM Eastern Daylight Time, dickburk@xxxxxxxxxxxxx writes: > Simply that when using ISO speeds the exposure in bright > sunlight is f/16 at a shutter speed equal to 1/ the film > speed. So, for Plus-X (ISO-125) the exposure would be f/16 > at 1/125th second. This works OK but one must decide what > constitutes an average scene and what "bright sunlight" > means. > "Bright sunlight" in this sense means just about as bright as it gets on the clearest day in say, Boston, Washington DC, or Atlanta Georgia. It means sunlight that casts a sharp-edged shadow, as opposed to a diffuse one, and of course it refers to the light falling on the subject, which may be different than that falling on the photographer. Sunlight that casts a shadow, but not a sharp-edged one will require one full stop more, and bright but diffuse overcast with no discernable shadow will need two stops more. Add another half stop to any of the above if it's within 2.5 hours of sunrise or sundown. G. King --- Rollei List - Post to rollei_list@xxxxxxxxxxxxx - Subscribe at rollei_list-request@xxxxxxxxxxxxx with 'subscribe' in the subject field OR by logging into www.freelists.org - Unsubscribe at rollei_list-request@xxxxxxxxxxxxx with 'unsubscribe' in the subject field OR by logging into www.freelists.org - Online, searchable archives are available at http://www.freelists.org/archives/rollei_list