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<blockquote data-quote="nickt" data-source="post: 373498" data-attributes="member: 4923">Some people just like it. But the main reason is it lets you keep your camera in af-c, but by simply letting go of the button, you lock auto focus, just like you could if you were in af-s. So you have two auto focus servo modes instantly available. Focus and recompose is not possible in af-c servo mode with the shutter button, but with the back button technique you can focus and recompose even though you are in af-c. Just let go of the back button. I have come to like the technique.This explains it well:<a href="http://nikonrumors.com/2014/01/25/how-to-use-nikons-af-on-and-back-button-autofocus.aspx/" target="_blank">How to use Nikon's AF-ON and back button autofocus | Nikon Rumors</a>What he does not mention is that some cameras will not fire when recomposing because it no longer sees focus at the focus point. On those models, you have to set your menu up so that af-c uses 'release priority'. I think your d70 automatically gives you release priority when in af-c mode.</blockquote>

[QUOTE="nickt, post: 373498, member: 4923"] Some people just like it. But the main reason is it lets you keep your camera in af-c, but by simply letting go of the button, you lock auto focus, just like you could if you were in af-s. So you have two auto focus servo modes instantly available. Focus and recompose is not possible in af-c servo mode with the shutter button, but with the back button technique you can focus and recompose even though you are in af-c. Just let go of the back button. I have come to like the technique. This explains it well: [url=http://nikonrumors.com/2014/01/25/how-to-use-nikons-af-on-and-back-button-autofocus.aspx/]How to use Nikon's AF-ON and back button autofocus | Nikon Rumors[/url] What he does not mention is that some cameras will not fire when recomposing because it no longer sees focus at the focus point. On those models, you have to set your menu up so that af-c uses 'release priority'. I think your d70 automatically gives you release priority when in af-c mode. [/QUOTE]

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