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The manual way to calculate is distance/guide number=diafragma goes for bouncing also but. As distance you need the distance the light travels and open one or two extra stops depending on how reflective the bounce surface is.
Guido
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Ist ds, K10D, DA 18-55, FA* 24/2, FA 50/1.4, F 100/2.8 macro, F 70-210, DA* 300/4, Manfrotto 055 Nat
Nature pic's And the Pentax Gallery
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