Is auto ISO fixed with fill flash?

Started 2 months ago | Questions thread
sybersitizen Forum Pro • Posts: 20,757
Re: Is auto ISO fixed with fill flash?

Kev The Doc wrote:

dbm61 wrote:

Auto ISO and TTL are counter-intuitive. Auto ISO will try and boost the exposure before the flash even fires. Then TTL tries to sense the needed flash to fill in the rest. And bouncing a flash loses power. So you're using the worse possible scenario for the flash ...

I’m not sure how you’ve come to the conclusion that auto iso and TTL are counter intuitive? I’d say they work together to yield the correct exposure, but until you’re experienced and knowledgeable with flash shooting you might not always get the desired results.

If the discussion is about auto ISO in combination with TTL autoflash, Sony cameras have a pretty long history of generating some less than ideal results that way. (Maybe other brands as well, but my experience with those is limited.) I wouldn't use the term counter-intuitive, but I'd call it a less than ideal approach.

I had exactly the same problems as the OP when starting off, but now I realize I didn’t know what I was doing 😀.

Now that you know what you're doing, how do you make auto ISO with TTL autoflash produce ideal results every time? What do you do differently now?

As for the original question ... One possible reason for the auto ISO algorithm to choose a lower value than the designated maximum is that the camera knows a flash will be fired during the exposure, and there will be more light than is provided by the ambient source, so the ISO won't really need to be set as high as it would without it. But a potential sticking point is that the camera can't accurately predict how much light the flash will be able to contribute until the metering flash is fired and analyzed, when the ISO has probably already been set.

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