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The following opinions have been automatically translated with Google Translate.
Opinion:I use it exclusively with the 100-400 on Sony A7-III when I need more range, the quality it returns is almost the same as smooth, with the only exception for the loss of brightness but it is obvious, the weight the compactness the fact of being tropicalized are all Plus! The price is a little high is true, but it is fully reflected in what it offers so I would say more than justified, never in any of the brands I have owned over the years I have found the features i have found on this little gem, is it a saviolinata? it is but for true merits established in the field, which in my opinion are worth more than a thousand laboratory tests. I certainly recommend it to anyone who needs more scope with their goals.
Opinion:I tried it with A9 and A7RIII multiply ingusing the 100-400mm. f4,5-5.6, the 200-600mm. f5.6-6.3 and the 600mm f4, photographing optical and still subjects. With all 3 of the optics tested I found a superlative yield! There is no loss of sharpness! I had never seen such high quality even with the excellent Canon multipliers.