Sony 1.4x Teleconverter Lens

The sharpness holds up perfectly even with the 1.4x reach added, and the build feels just as solid as the lens itself. I was worried about losing light, but autofocus stayed snappy in dim conditions.

I mounted this on my 200-600mm and the autofocus is still snappy even in low light, which surprised me. It's impressive how sharp the images stay despite the extra glass.

My 70-200mm now reaches out to 280mm and the autofocus hasn't slowed down a bit. The build feels solid and weather-sealed, and I'm honestly impressed at how sharp my shots stay at the long end.