BACKLIGHTING &
FILL FLASH.
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Remember boys and girls. There were no secondary light sources on the moon. No reflectors (other than the moon's surface which is equivalent to asphalt in terms of reflectivity, and you don't see many flash photographers bouncing light off THE ROAD
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). No gobos. No rogue flashbenders.
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It is possible to pick up
some bounce fill off a white spacesuit - but you'd really need to get your angles right.