This is a quick guide on how to properly balance your brushless gimbal. Its important to first balance your gimbal with your camera before you try to tune it as some parameters will change if you are using a different camera.
Its best to first choose what camera/lens you are going to use and try not change it as you will probably need to go through the whole balancing process again if the Centre of Gravity (COG) changes significantly (such as with zoom lens) In general a 14mm to 35mm lens is what you want to use with a gimbal as it gives a nice wide angle. Its also a good idea to put things like camera battery, memory card etc into to the camera before balancing.
Another tip is to attach a quick release mount as its makes life much easier when you need to remove the camera, or put it back on.
Balance the Pitch Axis
The first step it to balance the pitch axis as shown in the image above. You will need to adjust the height of the camera and also the position (forward/backwards). When its perfectly balanced then when you move the camera to point down slightly, then it will stay there (with no power to motors/gimbal controller). See the video at the end of this post for an example.
Balance the Roll Axis
Follow adjust your gimbal to make sure the COG of the camera is along the motor axis as shown in the image above. Again once its balanced when you change the angle it will stay there when the gimbal is turned off. A video of a balanced gimbal is shown below.
Hopefully this guide can be of some use to help you get the best performance out of your brushless gimbal!