What is to consider when using a Flash/Color Meter with a flash using Pre-Flash?
When pre-flash fires, a flash/color meter cannot meter accurately.
This is because the purpose of pre-flash is to assist ADI/Pre-flashmetering, not to provide illumination for the picture. Cancel HSS (see flash manual) or eliminate the influence on metering using. However, if you use the test-flash button on the flash, the pre-flash will not fire.
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