Quote Originally Posted by RalphLambrecht View Post
there is reciprocity failure due tolow intensity exposure and long exposure times but also due to high light intensity and short exposures. both create a similar problem, under exposure. since you can't extend the flash exposure times,only opening the aperture can battle this problem. try opening by a stopand tick to your development regime for now. adjust from there.
I beg to differ about one point. As you increase the strobes power you decrease the flash duration, as you lower the power output you increase the flash duration ... So you do have some control over the flash duration (exposure time).


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