When you are outside you are going to notice that you are unable to control the light the same way as if you were indoors and using studio lighting or a portable light kit. All you have is a viewfinder on the Bolex 16 mm film camera and that does not give you the kind of information about the final image that the LCD screen would on a regular digital video camera. This means that you are going to have to go through a number of steps, remember certain principles about lighting, and trust your video equipment.
Never film outdoors in locations with lots of people without a clear light meter as the light will likely change for every set up. Make sure that crowds of people are staying away from any local light source that you want to use and that they do not create shadows. Understand that the image in the viewfinder of the Bolex 16 mm film camera is going to be a little darker than it may come out, so you should usually try to trust your light meter readings.