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Message: <blockquote data-quote="JohnFrench" data-source="post: 368127" data-attributes="member: 6063"><p>I have both the Tamron 16-300 and the 18-270, that both shoot excellent photos through most of their range for sure.  My 7100 will hunt sometimes or fail to focus when there is not enought light, or it can not focus because of not enough contrast I think.  I use mostly 'full automatic", for the photos I grab on the fly.  One time I had a Sigma 150-500 on the 7100 for long distance shot when it would not focus, I found that my ND filter was the issue and I took it off and the 7100 focused fine.  So all of that said, don't panic, it's just a small issue I'm sure.  Let the folks here work you through it if you have not already resolved the issue.</p></blockquote><p></p>