400mm
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400mm

Image quality at 400mm is slightly lower than it is at 100mm, but when shooting distant objects, as always, air quality and thermal haze can also be a factor when it comes to sharpness. At 400mm minimum focus is 4.5m (14.6 ft)

Autofocus performance is pretty good with decent light, but prone to hunting in lower light levels. You have two AF modes: face detection + tracking (a sensible default, which works reliably well for most subjects) and single point AF as an option. Continuous AF can also be toggled on/off.