"Hi Brenner,
You need a cable that breaks out the focus and shutter pins from the multi port. They need to be shorted to ground to command the RX100III to shoot. If your trigger is based on a PWM (servo) signal then you need something like the…"

"I took a look at a QX100 and the 10 extra pin are located behind the 5 usb pins. (Or maybe I am just getting a bit blind)
The QX1 might have more functionality, or someone just figured it out :-) According to this page its doable:…"

"Forgot: The connection is the full 15 pin multi port, so maybe...."

"@Reuben
Yup, did that and the answer is no. However, surely there is a way. There always is. The multi port is the only physical connection (not counting HDMI) and probably where testing and debugging is done. On the multi port connector, a resistor…"

"Yes but it seems like Sony has crippled the interface so no LANC or wire trigger is supported. I checked today. The only solution seems to be the screw-driver/soldering-iron way.
Best
Esben"

"Yes sure, it's just nice to be able to interface with it the "right" way :-) But I'll bring out the soldering iron..
Thanks
Esben"

"Hi,
I have had a bit of experience with the RX100 III for geo-mapping. In my opinion it offers one of the best weight to quality ratios that a have seen. However..
For very precise mapping a feedback mechanism on the exact trigger time is important…"

"I think you are right :-) It could have been a nice camera for aerial work..."

"Hi Reuben
I had the chance to try out a QX100 and I plugged at Sony remote trigger into the multi port. Didn't work unfortunately. Works fine one the RX100. Have you had any luck with this the QX100 camera?
Best
Esben"

"The StratoSnapper needs a servo signal of some sort. I don't know if that's possible with A9?

Perhaps if someone could sketch out what is possible, we'll be happy to make a firmware change to allow this option.

Best
Esben"