Take this to the bank when shooting candlelight: ISO 400, 1/15 second, f/2.8-and-a-half. Give or take a smidge (technical term). Flash settings: dial -2 EV (exposure value), and put half-cut of CTO (an amber/warm gel) over the flash head. That's it. Looks like candlelight.
This tip is better than "Foxy Lady in the third race at Belmont." It works, and it won't cost you any dough.
Just remember to stay close to the candle. And remember, the candle is warm, yellow light. The last thing you want to do is blow that away with a strong, neutral white light. If you do that, you are setting up a psychological disconnect for the reader. Instead of getting involved in the photo, the reader says, "Huh?" Lighting is all about feel and color, and in this soulful, quiet situation (photo pictured), you feather the light in, and you stay away from the settings on the strobe that say "jackhammer."
Excerpted from: The Moment It Clicks. Photography secrets from one of the world's top shooters. By Joe McNally, Copyright 2008 Used with permission of Pearson Education, Inc. and New Riders