emmanuel_b1 Posted September 10, 2015 Share Posted September 10, 2015 <p>Hi there,<br>I don't remember.<br>Generally for using TTL flash unit , is it necessary to setup the flash with for example aperture and iso?<br>In my opinion, it should not be.</p> Link to comment Share on other sites More sharing options...
wayne_f1 Posted September 10, 2015 Share Posted September 10, 2015 <p>No, the TTL metering automatically sets the TTL flash to the correct power level for the current camera aperture and ISO.<br> The only time the flash is concerned with knowing aperture and ISO is for the GN or non-TTL A modes (when the flash has to compute exposure). Otherwise, in Manual flash or TTL flash modes, the flash is told (by user or by camera) what power level to use.</p> Link to comment Share on other sites More sharing options...
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