Tamron 150-500mm f5-6,7 Di III VC VXD Nikon Z

I was honestly surprised how sharp this stays at 500mm wide open—even handheld shots of distant birds held up beautifully. The autofocus locks on fast enough that I stopped second-guessing my timing.

The vibration compensation works so well I can hand-hold sharp shots at 500mm in twilight, and the autofocus locks onto birds through branches faster than my old lens ever could.

The autofocus on this lens is genuinely fast, locking onto birds mid-flight with barely any hunting, and the VC stabilization keeps the viewfinder rock-steady at 500mm. It's heavier than a prime, sure, but for the reach you get in a zoom, it's totally manageable on the Z6 III.