I'm using this EF-S 55-250mm f/4-5.6 IS STM on my m4/3 cameras but also my Z Cam cameras, including the S6 6K.
Overall, very nice, well made lens. Big zoom range. While not absolutely tack sharp, it's plenty sharp enough for video.
I use the "no glass" metabones adapter or the Canon Z Cam mount.
There's several versions of this lens, you want the STM.
Very nice oof at full telephoto. At F9, there is some diffraction, but the DOF is super narrow if you want that effect on m4/3. At F5.6 it's like half inch at full tele.
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