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A lot of the time, kids just stop what they are doing and stare at the camera when they see someone taking a picture of them. That would be boring and awkward. You may want to keep your distance to hide your presence and the fact that you're taking their photo. This way, you can catch them at their most candid moments. Having awesome
zoom lens will come in really handy in these situations. There are moments with kids that catch you off guard, though, and you have to be ready for these instances.