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<blockquote data-quote="lrlebron" data-source="post: 769497" data-attributes="member: 39463">I am thinking about replacing my Tamron 150-600 (original) lens. It is having focusing issues. Sometimes it refuses to focus and I have to take it off and put it back on the camera to get it to work again. If you like to shoot birds like I do this is a serious. Other times it just misses focus. I will be using the lens on my Nikon D500.My main candidates for replacement are:Nikon 200-500Tamron 150-600 G2Sigma 150-600 CFrom the reviews I have read this is what I have learnedNikonSharpest image&quot;Best&quot; autofocusSmaller focal rangeHeaviest of the threeTamron G2Longer focal range than the NikonSharper than my original Tamron but not as sharp as the NikonLighter than the NikonProgrammable via the dockSigmaLeast expensiveThe lightest of the threeLonger focal range than the NikonNot as sharp as the original Tamron Any opinions on&nbsp; these lenses would be greatly appreciated.</blockquote>

[QUOTE="lrlebron, post: 769497, member: 39463"] I am thinking about replacing my Tamron 150-600 (original) lens. It is having focusing issues. Sometimes it refuses to focus and I have to take it off and put it back on the camera to get it to work again. If you like to shoot birds like I do this is a serious. Other times it just misses focus. I will be using the lens on my Nikon D500. My main candidates for replacement are: Nikon 200-500 Tamron 150-600 G2 Sigma 150-600 C From the reviews I have read this is what I have learned Nikon Sharpest image "Best" autofocus Smaller focal range Heaviest of the three Tamron G2 Longer focal range than the Nikon Sharper than my original Tamron but not as sharp as the Nikon Lighter than the Nikon Programmable via the dock Sigma Least expensive The lightest of the three Longer focal range than the Nikon Not as sharp as the original Tamron Any opinions on these lenses would be greatly appreciated. [/QUOTE]

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