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Message: <blockquote data-quote="nickt" data-source="post: 530006" data-attributes="member: 4923">Just to throw a little more info out there in simple terms:The focus modes like auto area, dynamic, single point, etc. These modes are "how the camera determines a focus point". The camera looks at your subject and uses the selected method to find a focus point.Af-a, af-c, af-s are focus servo modes. These are "how the camera behaves after it finds a focus point"  Basically will the camera focus once and stop or will it continue to servo and attempt to keep the subject in focus. Af-a in theory gives you both servo modes, but nobody trusts it.Not all combinations of focus mode and focus servo mode are allowed, but that will become more clear as you learn them.</blockquote>