Sony HVL-F43M Operating Instructions Manual page 73

Power level indication
According to the power level interval you set, the power level changes as follows.
When set to [0.3]
F button
1/1 t 1/1(-0.3) t 1/1(-0.7) t 1/2 t 1/2(-0.3) ... 1/64(-0.3) t 1/64(-0.7)
t 1/128
f button
1/1 T 1/2(+0.7) T 1/2(+0.3) T 1/2 T 1/4(+0.7) ... 1/128(+0.7) T 1/128(+0.3)
T 1/128
When set to [0.5]
F button
1/1 t 1/1(-0.5) t 1/2 t 1/2(-0.5) ... 1/64 t 1/64(-0.5) t 1/128
f button
1/1 T 1/2(+0.5) T 1/2 T 1/4(+0.5) ... 1/64 T 1/128(+0.5) T 1/128
Sometimes the power level indication differs depending on whether the f button or
F button is used, even if the power level is the same.
Example:
1/1(-0.7) is the same as 1/2(+0.3).
1/1(-0.5) is the same as 1/2(+0.5).
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