I have just bought Matrice 600, Ronin MX, SRW-60 and a GH4...How do I connect the camera so I can take video and still images when the Matrice is flying?
I have a remote control for the camera when I am using tripod for groound work and works (supposedly ) up to 100 metres away but I don't think this is a suitable solution.

Hi xylotecxz,

If you want to control you GH4 during your flights with Matrice 600 and Ronin MX, you will need the Ronin MX Start/Stop unit : http://store.dji.com/fr/product/ronin-mx-remote-start-stop.

You will have to had the proper control cable, for your GH4 it's this one : http://store.dji.com/fr/product/ ... om=related_products and the extension rod (apparently not mandatory) : http://store.dji.com/product/15mm-rod-set  (page 5 and 6 of the documentation)

Here is the documentation about the Ronin MX Start/Stop unit : https://dl.djicdn.com/downloads/ ... ide_en_20160624.pdf

Then, according to this documentation, your remote control will have the ability to take pictures and start recording videos !
However it seems that they are lack of stock of these products. I've ordered them last week and they told me that my order was delayed due to this lack of stock.

Lucien.

Lucien hit the nail on the head with what you need. You should be able to find the Remote Start/Stop through dealers as well.

How do you control the focus? on a GH4 or any other camera?

DJI Focus.  That will work.