Yes, I use both Z1.4x & Z2x lenses without hesitation when the story requires it. When shooting from a friend’s hide this past week, the Z2.x on the Z600f4 TC allowed me to get the image size I desired – this time with 1680mm focus distance – at once when the internal 1.4x was engaged by connecting Z2x! As can be seen below all feathers around her eye were loaded with detail as the Z9 focused perfectly! And no hesitation from me for taking shots with my Z600f4 TC @1680mm!