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Optimal Autofocus

2019-12-05 • SEND FEEDBACK
Related: focusing

This article is part of a series. See Introduction to Camera Features to start.

Autofocus accuracy has gotten really good, but falls flat in the context of focus shift and field curvature.

Requirements:

  • Deadly accurate focus mode with pinpoint AF relying on image analysis including near/far focus peaking.
  • Deals with secondary color intelligently.
  • Focus wide open or one stop or two stops down or specified aperture, but compensate for focus shift at shooting aperture vs focusing aperture.
  • Must take into position within frame of focus position (e.g., compensation in center differs for edge of frame or similar).
  • Can be disabled.
  • Must not get in the way of using manual focus!
  • Works with AF initiated via shutter or with AF-ON.
  • Option to focus first, then press button to see adjustment (two step compensation).
  • Incorporates focus lock and recompose support.
Autofocus Accuracy
Sony Nikon Fujifilm Canon Panasonic Leica
           
Some cameras focus wide open, some at shooting aperture, some arbitrary and unpredictable.


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