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Message: <blockquote data-quote="aroy" data-source="post: 310628" data-attributes="member: 16090">Are you using "Matrix" metering? If so, try "Spot" or "Center Weighed", that may help. Another thing is that the lens/camera combination may not be detecting the distance properly. For TTL to work the distance has to be reported by the lens. I have 50mm F1.8, non D, so the flash has to be compensated for every distance, but I have never had the flash not firing.By the way do you keep your flash "popped up" or assume that the flash will pop up when needed. In my case with the flash popped up it fires every time - under Aperture Priority setting. If you are using the program modes, then the camera does the thinking for you.</blockquote>