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.