jim wilson wrote:
"Dave Moorman" wrote in message
]...

In article
,
Grumpy AuContraire wrote:


The F16 rule is ASA speed equal shutter speed @ F16 in bright daylight.
Experience dictates variables from that point. Cloud cuts off the sun,
drop to F8 etc.

Is the other part of that rule of thumb that you set the exposure time
for 1/the lens length? I.e., if you're using a 75mm lens, set the
exposure time 1/75 (or as close as you can get).

Sorry I never heard that one-the focal length by itself has nothing to do
with exposure, only the lens aperature. F16 on any lens passes the same
amount of light.
jim



I don't know why any adjustment would have to be made for any focal
length lens with aperture markings would require compensation.

JT