David Nebenzahl wrote:
On 3/3/2009 12:31 PM Michael Benveniste spake thus:

"Annika1980" wrote in message
...

Remind me again .....

I just got a few rolls of Kodak Ektar 100.
Everything I read says to rate it at either 50 or 64 instead
of 100.

If Johnny tells you to jump off a cliff ... (I'd rate it
at 80 myself).

Doesn't the difference between ISO 50 and 64 fall well under the
tolerance for inaccuracy in most camera's light meters? In other words,
won't make any visible difference.

For me, ISO 50 and 64 can be treated as identical for all practical
purposes. Even 50 and 80 are pretty dang close (1 stop vs. ~2/3 stop
difference).


Calibration may be out a bit with any given meter, but the repeatability
should be pretty accurate. You should always test a film against your
meter to find the best setting for your camera, after which the meter
should be as accurate as you want.

Professional meters like the Sekonic range for example are guaranteed
accurate to within 1/10 of a stop, provided it is used intelligently.

Colin D.