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<blockquote data-quote="Horoscope Fish" data-source="post: 259634" data-attributes="member: 13090">I can't speak specifically to the D90 or the D610 but if those are like most Nikons, you have been using Focus Tracking if you've ever used AF-C because it's enabled by default and active (when using AF-C). What it does is allow the camera to determine what the subject is in your frame so it can lock focus ON that subject for a period of time. Say for instance you're at the zoo; taking pictures of monkeys because you just looooove you some good monkey shots. You focus on Monkey A and your camera determines Monkey A to be your subject, so it locks focus on Monkey A in case he moves. Just as your about to pop the shot, though, Monkey A moves behind Monkey B, fouling your shot. Curses! Focus lock keeps the focus locked at Monkey A's position, however, for a period of time (as determined in the menu for this setting). If Monkey A suddenly pops out from Behind Monkey B, the focus lock still has him in sharp focus because it &quot;locked on&quot; to him before he hid behind Monkey B. This being the case, AF does *not* need to re-acquire focus on Monkey A. If Monkey A spends too much time behind Monkey B, though, AF will need to be re-acquired but again, the amount of time the &quot;lock&quot; stays on is determined by the menu setting.Hope that helps.......</blockquote>

[QUOTE="Horoscope Fish, post: 259634, member: 13090"] I can't speak specifically to the D90 or the D610 but if those are like most Nikons, you have been using Focus Tracking if you've ever used AF-C because it's enabled by default and active (when using AF-C). What it does is allow the camera to determine what the subject is in your frame so it can lock focus ON that subject for a period of time. Say for instance you're at the zoo; taking pictures of monkeys because you just looooove you some good monkey shots. You focus on Monkey A and your camera determines Monkey A to be your subject, so it locks focus on Monkey A in case he moves. Just as your about to pop the shot, though, Monkey A moves [I]behind[/I] Monkey B, fouling your shot. Curses! Focus lock keeps the focus locked at Monkey A's position, however, for a period of time (as determined in the menu for this setting). If Monkey A suddenly pops out from Behind Monkey B, the focus lock still has him in sharp focus because it "locked on" to him before he hid behind Monkey B. This being the case, AF does *not* need to re-acquire focus on Monkey A. If Monkey A spends too much time behind Monkey B, though, AF will need to be re-acquired but again, the amount of time the "lock" stays on is determined by the menu setting. Hope that helps... [COLOR=#ffffff]....[/COLOR] [/QUOTE]

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