BlakeinatorMate Senior Member  438 posts Likes: 1 Joined Feb 2011 Location: Australia More info | May 14, 2011 17:18 | #1 So the simple equation GN divided by distance = aperture. What has flash output got to do with this. The equation is for flash output on full power right? How would you properly decrease the power of the flash and still have the exposure exactly the same as it would be with full power? 16 year old photography and videography enthusiast.
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PhotosGuy Cream of the Crop, R.I.P.  More info | May 15, 2011 10:14 | #2 Guide numbers are sometimes (usually) a bit optimistic. You'd be better off if you did some test shots & figured out what yours really is. The first section is here: https://photography-on-the.net/forum/showthread.php?t=171657 Then you can use "Flash fact #3:" to modify your exposures at different distances. FrankC - 20D, RAW, Manual everything...
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