I own a Panasonic Gx9 camera and a 100-300mm lens. That gives nice reach, not that more reach could not be even nicer (for waterfowl, etc.)
Is there an adapter for Micro Four-Thirds that has good autofocus performance with any of the Canon EF mount Sigma or Tamron zooms going up to 600mm? And does that combination have any other issues.
I am not concerned with weight or balance in this instance.