...focus on a light or low contrast point. Canon lenses do not seem to have this problem. What to do. In low light situations, connect a speedlite flash to your body (e.g. 430EXII or 580EXII). These ...
...The red focus assist beam sent out by that external flash unit only helps focus within about 20 feet. Solution? Find a place with more available light, or buy one of the lenses with f/2.8
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