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Message: <blockquote data-quote="Clovishound" data-source="post: 845403" data-attributes="member: 50197">It doesn't have to be that warm. It's about the sun warming the surface warmer air rising into cooler air. It has to do with differential air temperatures. I have seen it on cool mornings with bright sun. With the Z8, you should notice a big difference in how well the autofocus tracks subjects. Be sure and turn on object detection and choose the people icon. I had good luck with the 200-500 on my Z8 using 3D tracking mode with object detection for tracking birds in flight. BTW, you will need an FTZ adapter to mount the 200-500 on the Z8.</blockquote>