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<blockquote data-quote="WayneF" data-source="post: 444388" data-attributes="member: 12496">I don't recognize BIF, but I assume it must mean Builtin Internal Flash?Manual means the camera?&nbsp; Or the flash?Manual camera is fine, a TTL flash is still automatic.But turn Auto ISO off for flash. Auto ISO is based on the ambient.&nbsp; A manual flash cannot respond to ISO changing.&nbsp; Camera manual mode will vary shutter speed with ISO.&nbsp;&nbsp; There was no clue offered what you might be doing in this regard?If shooting too fast, not allowing full recycle, that will cause the flash power to vary poorly.You probably do not want a fully exposed bright TTL picture for this.&nbsp; Try manual camera, and manual flash (adjust manual power as desired), and Auto ISO Off.&nbsp; In the Commander menu, you can set Group A to be either TTL or Manual flash at a specified power level. Adjust flash power level to give the desired result.</blockquote>

[QUOTE="WayneF, post: 444388, member: 12496"] I don't recognize BIF, but I assume it must mean Builtin Internal Flash? Manual means the camera? Or the flash? Manual camera is fine, a TTL flash is still automatic. But turn Auto ISO off for flash. Auto ISO is based on the ambient. A manual flash cannot respond to ISO changing. Camera manual mode will vary shutter speed with ISO. There was no clue offered what you might be doing in this regard? If shooting too fast, not allowing full recycle, that will cause the flash power to vary poorly. You probably do not want a fully exposed bright TTL picture for this. Try manual camera, and manual flash (adjust manual power as desired), and Auto ISO Off. In the Commander menu, you can set Group A to be either TTL or Manual flash at a specified power level. Adjust flash power level to give the desired result. [/QUOTE]

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