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Are you using a solid tripod and ball/gimbal head?  I'm assuming so.


The 2x with the 100-500 L give you 1000mm at ~f/14.  But that is wide open.  Stopping it down a little and you're looking at 1000mm at around f/16 or f/18.  I think the extra reach is more important than the aperture in your use-case.  But be very careful, you're shooting a moving object and you may need to bump the ISO to keep your shutter speed high enough.


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