From: "JC OConnell"
I just got a macro lens today and want to do some
exposure testing with the istDS flash. I need a
gray card but dont have one.
anybody know of a common household item that
emulates 18% gray or an easy way to make one
with the pc? I have an accurate incident/reflectance
meter so I guess I could just do a bunch of gray
shade printouts till i find the right shade but
that sounds like too much work.
Brightly sun-lit grass is 18% gray in B&W.
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