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Old October 30th 15, 08:52 PM posted to rec.photo.digital
Alan Browne
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Posts: 12,640
Default How to measure ISO

On 2015-10-30 03:10, Alfred Molon wrote:
In article , Alan Browne
says...
You can do a standard candle test, if you like. Shoot a grey card in
direct sunlight.


Well, the sun light strength may differ depending on the day of the year
and the geographical location.


That is true enough but it's also one of the sole independent tests you
can do absent a lab with the right equipment.