1- Auto-focus all cameras simultaneously
Auto-focus can be found from the dashboard. There are two methods of doing it, and you'll need to experiment to know which one works best with your current hardware (some cameras / lenses work better with one mode than the other).
Make sure that
- You have proper light conditions.
- All cameras lenses are in Autofocus (don't worry, we're not going to try to auto-focus when taking actual pictures)
- The AF Method is set to focus on the center point on each camera
2- Single camera manual focus - from the software
From the live view panel, you can manually navigate through cameras (left and right arrows) and quickly perform manual focus by using the top and down keys. From the same window, there's also an "autofocus" button that does exactly what it has to do (but you need to set your lenses to autofocus to make this work)
3- Single camera manual focus - from the cameras
If you have experience using DSLR cameras, you won't learn anything in this section. Doing the focus on a multi-camera installation is the same as doing it for a single one. The focus is made from the camera, not from the software. Here's how I do it most of the times:
Option 1- When I do the focus using the calibration bar, I go in manual focus. Then, using the live view on the camera, I zoom to 10x (top right button on the back of the camera). From there, it's easy to simply manually focus on the center marker. If somehow your white square is not in the center anymore, hit the "delete" button from the back of the camera. Make sure you go back to Manual focus once you're done.
Option 2- If you can have someone standing on the center spot of your installation, then it's easier to use the automatic focus. For this, go in live view, switch to automatic focus (on the lens) and do a half press the shutter. One you hit the target, then go back to manual focus and you're done.
Here's a neat trick to automatically focus tons of cameras in a very dark (difficult!) situation. We used a Mexican blanket (a lot of details / texture) and we ran the autofocus process on it: