Wednesday 7 September 2016

autofocus - Why is fine focus adjustment sometimes necessary on DSLRs?




Many DSLRs have a "fine focus adjustment" option, stored in the camera per lens.


Why is it that some lenses need this?


Why do some lenses not project a focused image onto the sensor when the camera body has adjusted it to a point where it believes focus is correct?


I assume this is a side effect of NOT using the sensor itself to confirm focus, using the phase detection array instead...




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