Hi John, I have a Kenko Pro 1.4 teleconverter for my Nikons - I have used it on my 105 f2.8 Micro Nikkor with no problem. I know that you would be struggling with the 70-300 f4.5 unless you had a bright day and a well lit subject - I tried it once and then I got a 50-500 Bigma Sigma instead of trying to persist.
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