However, the only microphone that Canon sells to go with the camera is an expensive Bluetooth mono microphone kit, the WM-V1 Wireless Microphone. All other microphones I saw had to connect to a special input shoe, and that shoe doesn't work with my camera. Nobody else seems to sell any other mike or adapter for this camera, and I couldn't find any info on the pinout of the connector to make one myself.
Somebody has got to figure out how to make an adapter and attach a reasonably-priced microphone or two to this camera...
Step 1: The connector pinout
It's a 4-wire 3.5mm (1/8 in.) jack. It's set up for use with a typical consumer mike, and it can be used with a dynamic mike or an electret (condenser) mike. Electret mikes need external power to function, and can have either two or three connections. For a two-connector electret, the mike power and signal are carried on the same line, and for a 3-connector electret, the power and signal are separate. A cellphone external mike uses 2 connectors, while a PC mike uses 3 connectors.
The Canon jack supplies mike power on a separate line, so you can ignore the mike power lead and use a dynamic mike, or use a cheap PC mike powered by the camera. Great!