I have seen Kenko 1.4x PRO 300 TC for EOS on the eBay with the comment that some EF lenses do not work (autofocus) with it. The lenses mentioned were 50f/2.8EF MACRO,100 f/2.8 MACRO(NON-USM},300MM./4.0 IS USM & 85MMf/1.8 USM. This is the first time I hear about such compatibility problem. Does somebody have any experience like that? Thank you. Eugene.
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