Archived posting to the Leica Users Group, 1997/07/15
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On 14 Jul 97 at 20:15, Erwin Puts wrote:
> If in doubt use these two time honoured rules;
> The reflectance of fresh green grass is 18%, so metering on this area is
> identical to metering on a grey card.
> The sunny f/16 rule. Midday sunny light should give an exposure
> equivalent to f/16 and the reciproke of the ISO value of your film. That
> is a very easy way to check the accuracy of your exposure system.
Sorry to nitpick, but that should read ASA, not ISO.
ISO is ASA and DIN combined, ie 100 ASA, 21 DIN and ISO 100/21.
(DIN in degree notation to be entirely correct)
- --
Bye,
Willem-Jan Markerink
The desire to understand
is sometimes far less intelligent than
the inability to understand
<w.j.markerink@a1.nl>
[note: 'a-one' & 'en-el'!]