1. If the f stop is lower the opening enlarges to let more light into the camera.


2. The larger the f stop the smaller amount of light the camera will allow since the opening shrinks.


3. If the exposure is shorter, there is less time to let light be perceived.


4. Longer exposures allow greater amount of light to enter into the camera.


5. We put the f stop low and allowed a longer exposure for more light to be taken in by the camera.