chip_master Offline Upload & Sell: Off
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My experience with the high end bodies D8xx, D4, D3s etc they offer both options to enabled AF-ON with half depression disabled, or with both enabled. Even the venerable D300 has the option for both.
Others may disagree, but I liked / require having both options simultaneous. I'd use the back AF-ON when I'd need to have focus on action and then just full depress to get the shot with no need to worry about half depress and hold which can become a "pain" if you are shooting for hours. What was maddening was when I mapped the AF-ON on the D600 sometimes I'd forget to remap and would end up many OOF shots when the action was off and also when I handed the camera to someone else to shoot.
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