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<blockquote data-quote="FastGlass" data-source="post: 280700" data-attributes="member: 13822">Yes you can use auto ISO when using I-TTL or manual flash. When using flash, the cameras light meter doesn't care if your using flash or not. It's going to expose for ambient light regardless. So if your shooting in low light and you have your auto ISO enabled than yes the camera is going to choose a high ISO to obtain correct exposure when the other settings such as aperture and shutter can't be adjusted any more than what their allowed. So when using a flash in I-TTL. Once the shutter is triggered, the magic of the I-TTL system reads the light that is bounced off what ever subject your focus point is on and it decides how much light from the flash is needed. All this is completely separate from the cameras internal meter. If you want your background to fall into blackness than set your shutter so that no ambient light is recorded. The flash will still expose the subject correct. Remember when using flash, you have two exposures to deal with. Ambient and flash .</blockquote>

[QUOTE="FastGlass, post: 280700, member: 13822"] Yes you can use auto ISO when using I-TTL or manual flash. When using flash, the cameras light meter doesn't care if your using flash or not. It's going to expose for ambient light regardless. So if your shooting in low light and you have your auto ISO enabled than yes the camera is going to choose a high ISO to obtain correct exposure when the other settings such as aperture and shutter can't be adjusted any more than what their allowed. So when using a flash in I-TTL. Once the shutter is triggered, the magic of the I-TTL system reads the light that is bounced off what ever subject your focus point is on and it decides how much light from the flash is needed. All this is completely separate from the cameras internal meter. If you want your background to fall into blackness than set your shutter so that no ambient light is recorded. The flash will still expose the subject correct. Remember when using flash, you have two exposures to deal with. Ambient and flash . [/QUOTE]

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