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<blockquote data-quote="WayneF" data-source="post: 249307" data-attributes="member: 12496">Yes, the flash still zooms in camera M mode (assuming it all understands the Nikon CLS hot shoe communication system).You can set the flash zoom to manual, by zooming it manually (to be a mismatch), and the M appears on the LCD, and it won't zoom automatically then.&nbsp; Reset it (Nikon flashes) by by manually zooming it back to match the lens zoom, and the M disappears, and it zooms again.If not accounting for zoom, I think that was a factor.&nbsp; Zooming the lens to same view at 2x distance is 2x focal length (for same magnification).&nbsp;&nbsp; Zooming the flash is very much cruder and rougher, not the same concepts, and 2x mm is probably only about one stop, but ought to be 2 stops (but isn't).&nbsp; That part is about designing the reflector, not about the power. Otherwise (assuming manual camera and manual flash and manual zoom), sure, moving the camera and flash (and leaving all else alone) would be same as observing from a different distance.&nbsp; Either way, all else the same, 2x distance should be two stops down.&nbsp;&nbsp; 1/4 power at 2x distance should match 1/16 power at 1/4 the distance.&nbsp; There could be different room reflections occurring then.</blockquote>

[QUOTE="WayneF, post: 249307, member: 12496"] Yes, the flash still zooms in camera M mode (assuming it all understands the Nikon CLS hot shoe communication system). You can set the flash zoom to manual, by zooming it manually (to be a mismatch), and the M appears on the LCD, and it won't zoom automatically then. Reset it (Nikon flashes) by by manually zooming it back to match the lens zoom, and the M disappears, and it zooms again. If not accounting for zoom, I think that was a factor. Zooming the lens to same view at 2x distance is 2x focal length (for same magnification). Zooming the flash is very much cruder and rougher, not the same concepts, and 2x mm is probably only about one stop, but ought to be 2 stops (but isn't). That part is about designing the reflector, not about the power. Otherwise (assuming manual camera and manual flash and manual zoom), sure, moving the camera and flash (and leaving all else alone) would be same as observing from a different distance. Either way, all else the same, 2x distance should be two stops down. 1/4 power at 2x distance should match 1/16 power at 1/4 the distance. There could be different room reflections occurring then. [/QUOTE]

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