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<blockquote data-quote="§am" data-source="post: 109591" data-attributes="member: 9187">Take the GN (28) and divide it by the aperture you're shooting at to give you the distance the flash will fire;So on a f/1.8 50mm lens for example;&nbsp; 28/1.8 = 15.6m (at an ISO of 100).If you were to increase the ISO to say 200 then you need to multiply the GN by 1.4... so in this example it becomes;&nbsp; (28x1.4)/1.8 = 21.8mHere's another example, you know how far away your subject is (2.93m) so you need to know what aperture to use: GN/2.93mSo in this case; 28/2.93 = f/9.5 (not that you can get an f/9.5 but you then use the next closest aperture.Also, I'm assuming from your earlier figures you have the SB-700, in which case have a good read through the manual - there's some informative pages in there that explain all this&nbsp; <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile&nbsp; &nbsp; :)" loading="lazy" data-shortname=":)" /></blockquote>

[QUOTE="§am, post: 109591, member: 9187"] Take the GN (28) and divide it by the aperture you're shooting at to give you the distance the flash will fire; So on a f/1.8 50mm lens for example; 28/1.8 = 15.6m (at an ISO of 100). If you were to increase the ISO to say 200 then you need to multiply the GN by 1.4... so in this example it becomes; (28x1.4)/1.8 = 21.8m Here's another example, you know how far away your subject is (2.93m) so you need to know what aperture to use: GN/2.93m So in this case; 28/2.93 = f/9.5 (not that you can get an f/9.5 but you then use the next closest aperture. Also, I'm assuming from your earlier figures you have the SB-700, in which case have a good read through the manual - there's some informative pages in there that explain all this :) [/QUOTE]

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