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Message: <blockquote data-quote="spb_stan" data-source="post: 678098" data-attributes="member: 43545">Yes, I hope I did not give the impression that I use auto ISO with flash. It does not work as one might expect and can't since it has no information to work with that reflects the light conditions when the flash triggers. I was referring to general shooting when needing to control DOF and account for subject speed.  That is a case where it is convenient to use Auto ISO and manual exposure ....without flash at all.In fact I never use any auto exposure mode, only manual exposure when using flash. Using flash allows you so set everything for optimum subject conditions in manual mode...ISO for DR preservation vs flash power needed,  shutter for controlling ambient light, and aperture for DOF and setting ratio of room/scene ratio to subject illumination.   iTTL BL mode is one of the coolest features of Nikon flash and exposure interaction. Love it. All flash usage is manual exposure. Very easily, you can create the impact of the background versus subject exposure. Want to isolate a subject in a crowded room...no problem set the exposure without flash to -6stops and turn on the flash for iTTL BL in Matrix and bingo, well lit subject and a black background and the other people in the restaurant or event disappear just as an example. Or doe the opposite set the  metering in Matrix to decent exposure, by dropping shutter speed and let the flash freeze the subject and balance the exposure of slowly exposed dark background scene and your flash Rear Curtain, fires at the end of the long background exposure of say 1/10sec and the flash freezes the subject proper exposure.  A lot of flexibility with very little effort.</blockquote>

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