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Message: <blockquote data-quote="WayneF" data-source="post: 249216" data-attributes="member: 12496">Zooming the camera is not a factor, except if the flash was on camea, the flash zooming in is a factor, the point of which is to concentrate the flash power into a small area, which is brighter.   Generally in many speedlights, zooming from minimum to maximum zoom is near double GN, which is a couple of stops brighter.If you change absolutely nothing except monitoring distance, then double distance (of direct bare unmodified flash) should be two stops weaker (1/4).   Zooming the flash however is modification.In a small constricted area, it might appear not quite so weak, due to reflections from side surfaces redirected back in, adding to combine.</blockquote>