Depends on a number of factors. There is no right answer, just like with any other camera setting.
TTL - using FEC (Flash Exposure Compensation) is usually the easiest way to balance flash in low light. Combining this with "dragging the shutter" techniques and second or rear curtain sync is usually the best way to go. But, like I said, there is no right answer.
A few things to remember when doing flash photography:
Aperture controls flash exposure. FEC can be used more conveniently when using TTL mode.
Shutter speed controls ambient exposure.
ISO controls overall exposure.
Tv (Shutter priority) mode is great when doing indoor TTL flash photography. It'll allow your flash to do it's job getting subject exposure right, while allowing you control to balance ambient light.
Message edited by author 2010-10-29 11:47:00.
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