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<blockquote data-quote="WayneF" data-source="post: 346684" data-attributes="member: 12496">Right, the Nikon Teleconverters are sort of special, made for specific lenses.&nbsp; Tamron would be an unknown.Compatibility chart:<a href="https://www.nikonusa.com/en_INC/IMG/Assets/Common-Assets/Images/Teleconverter-Compatibility/EN_Comp_chart.html" target="_blank">https://www.nikonusa.com/en_INC/IMG/Assets/Common-Assets/Images/Teleconverter-Compatibility/EN_Comp_chart.html</a>Read the text at page top.But you have another problem too, with any TC.&nbsp; A 1.4x teleconverter reduces the light by one stop.&nbsp; A f/5.6 lens becomes f/8A 2.0x teleconverter reduces the light by two stops.&nbsp; A f/5.6 lens becomes f/11Nikon DSLR needs f/5.6 to focus.&nbsp; A few advanced newer models claim to focus at f/8.The Tamron lens is f/4-f/5.6, already f/5.6, so except for the widest zoom, auto focus would be expected to be an issue.&nbsp;&nbsp; This is the &quot;AF Limitations&quot; noted in the compatibility chart, for f/5.6 lenses.</blockquote>

[QUOTE="WayneF, post: 346684, member: 12496"] Right, the Nikon Teleconverters are sort of special, made for specific lenses. Tamron would be an unknown. Compatibility chart: [URL]https://www.nikonusa.com/en_INC/IMG/Assets/Common-Assets/Images/Teleconverter-Compatibility/EN_Comp_chart.html[/URL] Read the text at page top. But you have another problem too, with any TC. A 1.4x teleconverter reduces the light by one stop. A f/5.6 lens becomes f/8 A 2.0x teleconverter reduces the light by two stops. A f/5.6 lens becomes f/11 Nikon DSLR needs f/5.6 to focus. A few advanced newer models claim to focus at f/8. The Tamron lens is f/4-f/5.6, already f/5.6, so except for the widest zoom, auto focus would be expected to be an issue. This is the "AF Limitations" noted in the compatibility chart, for f/5.6 lenses. [/QUOTE]

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