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There is no info on the Meike website, any idea of price? Any comparisons yet?

My first reaction is that this is way over the top in price. I have the f4 version, which I will stick with, you can always ramp up the ISO. It will be interesting to see if the teleconverters work with my lesser lens?
I must admit that I got rid of my Canon L lenses when I swopped to Sony A7R (and now the A7RII), because I found the lenses had some focus trouble through the adapter, possibly a mistake.
I think I am going to hang on to see what the generic manufactures come out with for the longer lens. In the meantime I am finding my FE 70-200mm f4 excellent, with the ISO up and the 42.4 M, I can get good distance photos.