If you're serious about audio and don't mind a slightly larger setup, the Sennheiser MKE 600 is an excellent choice. It's a professional-grade shotgun...
@manncy Global shutter.
Sony a7 IV is one of the best cameras for Northern lights.
RS 4 Pro able to utilise optional intelligent LiDAR autofocus.
@b0b0b1 I agree, with Global shutter, FX3 II should looks like a FX6. So FX6 II is more likely to have a global shutter.
I use SanDisk Extreme Pro SDXC UHS-II, works great on my camera.
I use Tamron 17-70mm f/2.8 lens for my a6600 most time. One lens for travel photography.