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Message: <blockquote data-quote="spb_stan" data-source="post: 635269" data-attributes="member: 43545">Does the flash display show TTL or TTL BL?   Are you using bounce flash?  When checking the meter in the VF, is it centered or underexposed as it should be.The real problem with auto-ISO and flash is the camera has no idea of what you really want.  In the case of 400 ISO, it assumes you have under exposed intentionally because why use a flash if expose is right without it?  Are you setting a under exposed condition by about a stop? There are a lot of variables, and the camera is having to guess what you want. If the meter is centered and using direct flash, it will be assured to be over-exposed. It is using an ISO as reference that will underexpose so there flash contribution does not run  out of headroom of the shot.  How is the flash being used, what mode does it display TTL, M or TTL BL and is the shutter speed over 1/250, the flash sync speed? If over 1/320, the flash goes into high speed sync mode which greatly reduces power because it emits a very fast set up pulsed light for the duration of the shutter opening time.  That should only be used with direct flash, not bounce. If using bounce, it will under expose and the auto ISO will climbPlease describe the exact display information in the flash, whether it is locked in direct or at an angle, any FC dialed in, shutter speed you selected distance to the subject. That should be enough to track the problem down. None of this is needed if just use what all of us use with flash and strobes: fixed ISO.Try the same shot but 1/250 or slower, front curtain, and an iso that gives about 1-2 stops under exposed on the meter. Try is direct and bounce. Using matrix metering it should say TTL Bl, when shooting direct flash and TTL when metering spot.</blockquote>

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