David I find the 1.4x really good and have no hesitation using it , in fact use it a lot on both 70-200, 80-400 . From my understanding the 1.7x is better quality but I dont want to loose that extra stop of light . Maybe if I didnt have a 1.4 already then I may have gone with the 1.7 with fast glass at least. 70-200 is so sharp its very hard to pick any diff with or with out TC imho.
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