Can any of you Nikon long lens shooters recommend a 2x teleconverter that would work well with a 600 VR II and a Sigma 300-800 DG on a D3s? Availability on the Nikon TC 20E-III seems to be non-existent lately; anyone had any experience with either the Sigma 2X or the Kenko Pro-300 2X and know how either would stack up against the Nikon unit? (Yes, I know this is a manual focus proposition with any of the above).
Thanks,
Bill






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