I am trying to get a correct meter calibration as a starting point for proper ASA setting to use on my Sekonic L-358 with the purpose of making more accurate transparency exposures.
I am already familiar with the "1/ISO @f16" Sunny 16 rule which applies during the time of day 2hrs after sunrise or 2hrs before sunset on a sunny, cloudless day.
However, from all the threads I've researched, none has mentioned WHERE the dome of incident meter should be properly oriented in relation to the sky. The readings one gets vary widely based just on that!
Ie, does one hold the meter perfectly vertical, with dome directly toward the sun's direction? Or does one have the meter held at an angle up slightly with dome's center directly pointed at Sun's center? Or is the meter held horizontal with dome point perfectly straight up into the sunlight sky? Or is it "none of the above"?
Expert advise appreciated!
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