When shooting LF with multiple pops of a flash, it is easy to determine with a s pot flash meter, in multi mode, exactly how many pops of flash it takes to illum inate the subject sufficeintly for a given f stop. To prevent picture blur, I prefer to leave the lens open throughout all the pops. With recharge time of 7 seconds per flash, and 5 pops, that is an additional 27 seconds of ambient light the film will see not accounted for in the flash meter readings. How does one calculate the amount to cut back the multiple pops to account for all the ambie nt light hitting the film? Is there some value that can be assigned for an ambi ent EV reading of the existing light x the seconds open?
I realize I can use a black cloth over the lens between pops, but I pref er to leave the lens open. Thank you all in advance.
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