AF works perfectly for DIF both on DSLRs and mirrorless. I think it is because their wings flap so fast, are often transparent and relatively small that they are invisible to the AF compared with the body.I have used AF for insects on occasions, e.g. butterflies in flight, but in-flight butterflies change their outline or "shape" as they flap their wings, which makes it very challenging for subject recognition algorithms. AF works much better with dragonflies, as they hover and their shape is more easily recognised and tracked by the camera. Some of my best butterfly in flight shots were actually taken on an old Canon 6D, which had notoriously poor AF, so the hit rate was pretty low!
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