Wasting some photons on a cloudy morning, testing out the MC-20 2x teleconverter on the MZ 150-400mm. AF response slows down noticeably with this combo, as does AF precision, especially in low light. Image stabilization still works pretty well at 800mm (1,600mm FF equivalent) but does drop off dramatically at 1,000mm (2,000mm FF equivalent). I think I will leave that TC at home from now on.
