100-400L Auto focus

Started May 6, 2012 | Discussions thread
Senior MemberPosts: 1,500
In reply to richard hudes, May 6, 2012

Just curious because I haven't tried it... given that the moon is some 250,000 miles away shouldn't you have tremendous depth of field? Wouldn't that make it very hard not to get the moon in focus even wide open? Apparently though, it is hard. What am I missing?


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