Sony A1 Human Eye AF for Tight Head Shots, Sony FE 135mm f/1.8 GM
This page looks at Eye AF on the Sony A1 for close-range portraits at f/1.4 and f/4 on a tight head shot.
Sony A1: Eye AF for Portraits, Head Shots
Includes images up to full camera resolution, plus crops.
Below, a slight 'miss' for the iris.