The focus would be set according to \left(1+\frac{b}{6}\right)^sf so that f is the initial focus and s=-a..a for the default of a=2,b=6 assuming g=100mm we have FocusBracketing Dashesy 19:24, 28 May 2008 (UTC) dashesy Dashesy 19:24, 28 May 2008 (UTC)

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