The diaphragm of your camera is a little structure with an opening at its center: We called it the aperture. The role plays by it is to stop the passage of the light through the lens when you command.
You will have a lot to decide and bear in mind about setting the aperture of the camera:
- What is the size of the aperture?
- What is the depth of field: which can be directly affected by the aperture
- What Max and Min of the lens aperture of your camera?
Remember, you will need to provide the perfect answer to the above questions to be a professional photographer.