CameraLabs posted an interesting demo fo the ECM-B1M Digital Audio Shotgun Microphone and it has a lot of recording options that you can use to maximize your audio quality. The performance is actually pretty good for is size and price, but I would like to see some additional coverage. At this time the Sony a7RIV is the only camera with the necessary pinout to use the ECM-B1M.
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Sony a7RIV: B&H Photo / Amazon / Adorama
Sony VG-C4EM grip: B&H Photo / Amazon / Adorama
XLR-K3M Mic Input: B&H Photo / Amazon / Adorama
ECM-B1M Digital Audio Shotgun Microphone:
B&H Photo / Amazon / Adorama