I have just bought the Kenko 1.4 Pro 300 to fit my 80 - 400mm AF VR f/4.5-5.6D and D200 ...
First real outing today and first impressions are it is a great bit of kit ... no loss of functionality They do a x2 as well and equivalent less expensive units too ...
Similar Nikon units would not fit with this lens would you believe ... loss of functionality ... esp. AF ...
First choice would be a Sigma unit .... should be matched better with their own glass. I've got a Kenko which works ok with my Nikon stuff. There will always be a trade-off whichever marque you use.
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