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Message: <blockquote data-quote="nickt" data-source="post: 491815" data-attributes="member: 4923">I'm pretty sure you can. Re-assign the back button to af-on, set af-c mode and you are good to go. Af-c mode is always release priority on the d70, so that is good too. I'm not 100% sure if the d50 has release priority though, so OP might not be able to fire if focus point no longer sees focus. Its essential to have release priority for the technique to fully work. Easy enough for him to test though. My d3100 can't do it. No release priority. So even though I could initiate focus with the back button, if I recompose, it wont fire if there is no focus under the point.</blockquote>