Weird ugly bokeh with Teleconverter MC-20

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Omayok New Member • Posts: 2
Weird ugly bokeh with Teleconverter MC-20

Hello !
I have the Olympus OMD-M1 MK III
I just received my new Teleconverter MC-20 + Olympus 40-150mm f/2.8.
Unfortunately,  the bokeh seems so ugly in particular situation, like
zooming on a bird located at 6 meters from me .... Weird 'vertical shaking-looking' bokeh ....
Is the MC-20 ou 40-150mm f/2.8 is defect ?
Thank for help!

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