All flash ratios are expressed as A relative to B and as relative amounts of exposure. For example, “ 1 : 1 ” means firing groups A and B will produce equal exposure, “2: 1 ” means A will produce twice as much exposure as B, “ 1 :4” means B will produce four times (2 stops) as much exposure as A, and “8: 1 ” means A will produce eight times ( 3 stops) as much exposure as B.
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