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<blockquote data-quote="DraganDL" data-source="post: 273693" data-attributes="member: 18251">The whole idea is to decouple the shutter releasing (actuating) from the AF - you press (and hold) the back button and you turn the AF &quot;on&quot;. Once you stop pressing it, the achieved focus remains where it is, even if you zoom and/or change composition, and the shutter button only actuates...the shutter (and the metering, if you want it that way - most people do).Word of advice: when using telephoto lenses (or zooming into the telephoto range with lenses like yours) for landscape photography and/or &quot;regular&quot; portraiture, it is often better to rely on a manual focusing (especially when you have plenty of time for doing this, like when you took this second photo - unless you took it from within the vehicle in the motion!?).Also, remember that these lenses of yours are relatively slow (on any Nikon) at AF, so you better wait a little while the AF mechanism sets the focus &quot;dead on&quot;...</blockquote>

[QUOTE="DraganDL, post: 273693, member: 18251"] The whole idea is to decouple the shutter releasing (actuating) from the AF - you press (and hold) the back button and you turn the AF "on". Once you stop pressing it, the achieved focus remains where it is, even if you zoom and/or change composition, and the shutter button only actuates...the shutter (and the metering, if you want it that way - most people do). Word of advice: when using telephoto lenses (or zooming into the telephoto range with lenses like yours) for landscape photography and/or "regular" portraiture, it is often better to rely on a manual focusing (especially when you have plenty of time for doing this, like when you took this second photo - unless you took it from within the vehicle in the motion!?). Also, remember that these lenses of yours are relatively slow (on any Nikon) at AF, so you better wait a little while the AF mechanism sets the focus "dead on"... [/QUOTE]

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