As Taxi has said the Sony FE 90mm F/2.8 is outstanding for any Sony E mount camera and on the APS-C is equal to 135mm on 35mm size sensor. I would also consider the excellent E-mount Zeiss 50mm F/2.8 macro which is made for APS-C sensor Sony cameras. I just used this lens for a review in the current issue of Underwater Photography magazine uwpmag.com with the new Sony A6400 and Ikelite housing. The Zeiss 50 macro gives a 75mm 31 degree AOV v. an 18 degree AOV with the 90mm. Bot angles of view are very useful for macro with the 90mm being better for super macro with add-on closeup lenses.
The auto focus on the A6400 is way ahead of A6300/A6500 in speed and accuracy for both lenses.
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