Nikon 400 to Eight With a Teleconverter

It takes your favorite things to teleconverters, the 1.4 X and the two X,. A lot of their other mega zooms, like the 100 to 500, that only accepts it at a certain range. With the one four converter, your why does a 140 and your tele is a 420? It's actually four for four, right? That's an F four. You put on a two X converter by itself, you're at 200 to 600 at a aperture values five six. The max is like a 200 to 600, but it's still going to be big. And I still don't like teleconverter if it's a built in TC.