Thank you, Anthony &Akira!
The lens is 4/300PF with TC14E3 on my D500. Very small and light package with an angle of view and DOF equivalent to a 5.6/630mm DX lens @ 20MP. Great for Insects in flight and other stuff needing speed and stabilisation. The resolution is still very good and the current price for PF and TC together is roughly 2300€. As the 300PF is an essential item anyway you cannot go wron