Sony A7RIII ILCE-7RM3A Operating Instructions Manual page 175

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Interchangeable Lens Digital Camera

Phase detection AF

When there are phase detection AF points within the auto focus area, the product uses the combined autofocus of the

phase detection AF and contrast AF.

Phase detection AF is available only when an applicable lens is attached. If you use a lens that does not support phase detection

AF, you cannot use [Automatic AF], [

Also, even if you use a previously purchased applicable lens, the phase detection AF might not function unless you update the

lens. For details on compatible lenses, visit the Sony web site in your area, or consult your Sony dealer or local authorized Sony

service facility.