Sigma 1.4 TC v Nikon 1.4 TC

Started Apr 3, 2012 | Discussions thread
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WIMorrison
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Sigma 1.4 TC v Nikon 1.4 TC
Apr 3, 2012

I tried a Sigma 1.4 TC on the Sigma 50-500mm OS and it worked quite well, IQ was affected a tad but the the main issue was that the autofocus won't work on my D7000.

I made my Nikon 1.4 TC tye lens fit by grinding the locating tab that was preventing it from fitting and the autofocus works perfectly, but the IQ is not as good as with the Sigma TC - reasonable given it is a Sigma lens

This makes me thing that there is something in the Sigma TC that is preventing the autofocus from activating - does anyone know if the TC disables the autofocus and assuming it does, do you know how to get around this?

TIA

Iain

 WIMorrison's gear list:WIMorrison's gear list
Nikon D7000 Nikon D800E Nikon AF-S DX Nikkor 35mm f/1.8G Nikon AF-S DX Nikkor 10-24mm f/3-5-4.5G ED Nikon AF-S DX Nikkor 18-200mm f/3.5-5.6G IF-ED VR +11 more
Nikon D7000
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