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    The EOS M lineup will be addressed later in 2020 [CR1]

    According to canonwatch.com, the 100-300mm is f/5.6-f/8 which is very dark. But if the physical size is similar to the 55-200mm which easily fit in a small bag, I will still consider getting it. We can always adapt EF 70-300mm if we want a brighter telephoto zoom anyway.
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    Canon EOS R trouble with third-party lenses

    I have the Tamron 85mm too, it focuses accurately on my Canon 6D, but consistently back focused when adapted to my Canon M5, so I suspect it is somehow incompatible with M5's DPAF. (Same thing happen to Sigma 18-35 according to dpreview forum but Sigma release a firmware update which solved that...
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    Patent: New Consumer Level Zoom Lenses

    The first two lens are EF mount or RF mount?