The scenario you laid out was correct for TTL fill flash. Just leave
the flash off while you're trying to determine the ambient exposure so
the camera doesn't fight back. Even though in auto TTL mode you are
manually forcing the camera down to 1/60 when determining the ambient
exposure. Staying in TTL mode is still necessary to get the proper
output from the flash which is biased downwards by your twiddling with
the exposure compensation dial.
Chuck Norcutt
Rob Harrison wrote:
> On Tuesday, March 16, 2004, at 01:22 PM, Chuck Norcutt wrote:
>
>
>>I think this is all OK except in scenario #1 the flash should be turned
>>off while you are trying to determine the ambient exposure since the
>>camera will lock onto 1/60 as soon as it senses the flash is turned on.
>>
>
>
> Does the camera not lock back on to 1/60th when you turn the flash on
> again then? Or do I need to shoot in manual mode for this to work?
>
>
>>Also, although changing the ASA/ISO and changing the compensation dial
>>actually do the same thing (change the same variable resistor) you
>>should not lift the dial and change the ISO rating since you might
>>forget later. Just rotate without lifting. You might also forget to
>>reset the compensation dial but looking at the dial will tell you what
>>you did.
>
>
> Good point. Thanks!
>
> -Rob
>
>
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