When using the Tamron 90mm macro lens, he asks his model to step backward. In this test, Eye Autofocus is still working at 30-40 feet (9-12 meters) from the camera while in a poorly lit room – that’s impressive.
The Canon 70-200mm lens seemed to have trouble using Eye AF at 200mm when back-focused but not so when front-focused. Regular AF also works well.
He also found that the Canon 16-35mm f/4 lens and Tamron 150-600mm G2 lens benefit from Eye AF, but these lenses aren’t featured in the video.
(via The Brotographer via FStoppers)
from PetaPixel https://petapixel.com/2017/12/22/eye-af-work-canon-glass-sony-a7r-iii/
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