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p.3 #13 · 5DII Do you use one or all focus points | |
The exposure is separate for the camera and flash. I shoot flash with the flash in auto and the camera in Manual so I can control ambient light and shutter speed with the camera. As long as you stay in sync speed, shutter speed does not effect the flash, only the ambient light Go to the Strobist site and read the tutorials there--very helpful. Generally I use only the center focus point and recompose but Canon advises not to do this because the focus distance changes with recomposition--not usually a big problem unless shooting wide open with a very fast lens. I never use all focus points because you never know which focus point will grab focus, it may be one off your subject but in a high contrast area. I also use back button focusing so I cam focus on one area and choose another for exposure setting using the shutter button.
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