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<blockquote data-quote="WayneF" data-source="post: 506877" data-attributes="member: 12496">This is a &quot;I don't know&quot;, but it is really the same question for bounce flash on the hot shoe.&nbsp; The bounce is a longer path, so whatever lens zoom is set on the flash has more distance in which to spread out wider than the lens coverage. IOW, lens zoom seems &quot;wide enough&quot;.&nbsp; Twice the path distance should spread twice as much, which I think of as a safety factor for subject coverage.I'm not aware there is any good answer, but more spread shouldn't hurt, other than power dilution.&nbsp; Assuming power is not a concern, I usually just use 24mm on the standalone bounce flash (lazy).&nbsp; &nbsp; Once in a while, looking at the scene, or a high ceiling, I get the notion that a more narrow spread might work better (might concentrate more light on the actual subject), but I don't think there's any way to describe that case (maybe when sufficient power is a concern).&nbsp; Every case is surely different, but you could try a different thing or two in such a test case, and compare the results.</blockquote>

[QUOTE="WayneF, post: 506877, member: 12496"] This is a "I don't know", but it is really the same question for bounce flash on the hot shoe. The bounce is a longer path, so whatever lens zoom is set on the flash has more distance in which to spread out wider than the lens coverage. IOW, lens zoom seems "wide enough". Twice the path distance should spread twice as much, which I think of as a safety factor for subject coverage. I'm not aware there is any good answer, but more spread shouldn't hurt, other than power dilution. Assuming power is not a concern, I usually just use 24mm on the standalone bounce flash (lazy). Once in a while, looking at the scene, or a high ceiling, I get the notion that a more narrow spread might work better (might concentrate more light on the actual subject), but I don't think there's any way to describe that case (maybe when sufficient power is a concern). Every case is surely different, but you could try a different thing or two in such a test case, and compare the results. [/QUOTE]

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