400mm F5.6 need help

I plan on lots of practice, a 640mm is a different animal and needs to be treated as such I have discovered.

Was practicing over the weekend on flowers, well the wind was blowing so I packed up.

I will get there, this much I do know. Hoping to post great images from the Kruger in December, will have bags of time to experiment.
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I am not so under the affluence of incahol as thinkle peep I am!