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"RE: Birding with D7100"
1. I like to use either 9 or 21 points. This keeps you on the most sensitive focus points. I can usually keep those points over a flying bird. 2. Most of the time I keep this on the default setting. If you turn it off then focus can quickly jump to the background if the bird moves away from your selected focus point. For birds the size of eagles or hawks that are flying across a busy background it can be helpful to set it to a longer setting so that you can avoid focus shifting to the background. You probably need to experiment with this setting to get a feel for how it works in different situations.3. Your auto ISO set up looks good to me. I will sometimes bump up the minimum ISO to 400 to maximize shutter speeds before auto ISO kicks in.
Dave SummersNikonians Photo Contest DirectorMy Nikonians Gallery | Current Nikonians Contests