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Flash Exposure Differences

bobcowin

New York, US
4 posts

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bobcowin Registered since 05th Jan 2008
Thu 13-Dec-12 05:06 PM

I am using the D800 with a SB-910 flash. I've been taking photos at a couple of evening parties recently, so I set the camera to manual and set adjustments to get a little ambient light (ISO 640, 100th, f4.5 or there abouts). The flash is set to TTL and has the supplied dome as well as the tougsten "gel".

If I have the flash at 90 degrees (pointing stratght ahead) the subjects in the images tent to be underexposted by just over 1/2 a stop. If I turn the flash head up to 70 degrees or so, it does a much better job of exposing.

I am thinking that when it's straight ahead, maybe the camera simply uses the distance info from the lens to calculate how much flash to use, and when its's up, it depends more on the TTL readings?

I'm probably not doing anything right, but can anyone explain why I'd be getting such different results?

Thanks.

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