Thanks, Soundy! Very good illustration of how the availability of in-coming light changes as the lens gets longer...and explains why at maximum zoom my light levels in winter just aren't sufficient for what I was trying to do. I never did get my hundred-finch take-off pic. But it gives me something to shoot for in future.
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"We are--each of us--dying; it's how we live in the meantime that makes the difference."
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