Photo question. Using back button focus

Started 1 month ago | Discussions thread
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Crotonmark Contributing Member • Posts: 662
Photo question. Using back button focus

Shot this tonight using the Tamron 17-50. On a tripod. Focused on the moon. 
Could it be clearer? How? 
also, for those who use back button focus, how do you push the back button and not jam your thumb in your eyes ? Is it worth it?

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