FWIW, you don't have to have your lens in correct focus to measure a "gray
card". As a matter of fact, several manuals I've seen say to de-focus the
lens to eliminate any "dings" in the card.
You just have to ensure that the card is lit by the same light as your
subject.
Rgds,
Dave
Agree on the "Gray Card," I keep one in my Macro bag.
Just have not figured out how to use it with my telephoto's yet.
Kinda hard to hold it out to minimum focusing distance. You know, 8 to 10
feet or so. Especially when I am shooting some wily coyote or some man
eating
animal.
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