11.    Research the use of the histogram as part of your exposure calculation process:  

Before Histograms photographers used to use light meters to ensure that exposure was correct. Now that our cameras have built in light meters we can use our histograms to ensure that each photo isn’t over or under exposed. A Histogram is a representation of data, it reads the highlights and the shadows. There is no set right exposure to use because every scene is different, but the histogram helps the user understand if they have over exposed or under exposed. The Histogram on your camera reads left to right, representing Dark to Light.   

2. Focal Length:

A Lens focal length is measured in mm, it is the range that the lenses covers. For example the 18-55mm lens is wide angle and a 70-300mm has a closer range for view. Different focal length are used for different things, for example a wide angle is great for real-estate photography.   

 3. Angle of View: 

The Angle Of View is the scene captured by the image sensor, so a wide angle lens would capture more compared to a zoom lens, also the angle of view is the measurement of the breath of the subject.