Nikon Z 100-400mm f/4.5-5.6 S vs Tamron 70-300mm f/4.5-6.3

Partly for fun – and partly to see if you get what you pay for – I wanted to compare two rather different telephoto zooms today. One of them is among Nikon’s most coveted professional lenses, the Z 100-400mm f/4.5-5.6 S; the other is a third-party optic that costs about 1/3 as much, the Tamron 70-300mm f/4.5-6.3. Which lens wins? Well, that’s not going to be a surprise, it’s the Nikon. But by how much? That’s what I’ll cover below!