Olympus announced its intent to make a 150-400mm F4.5 zoom back in January. There was a demonstration sample on show at CP+ in Yokohama. The Olympus M.Zuiko Digital ED 150-400mm 1:4.5 TC1.25x IS PRO has a name that matches its considerable size.
Features (of some sort) galore
The side of the lens shows five switches, which we’d expect to give direct access to AF/MF, IS, focus limiting and two other things. Possibly including the control to engage and disengage the 1.25x teleconveter that’s built in.
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https://www.dpreview.com/articles/7452340372/cp-2019-olympus-shows-super-tele-zoom-and-2-0-tc-under-glass?slide=2