Photographic lenses come in many shapes, sizes, and designs, and are manufactured to fulfill many functions. The Camera Assistant need not be an optical engineer, but should know something about the way lenses work, and the limitations present in some of the wide range of lenses available to the cinematographer.
APPROXIMATE LENS ANGLE COMPARISON (ROUNDED OFF TO USABLE NUMBERS):
* also VistaVision
For purposes of our discussions, I have divided commonly used lenses into three categories; Prime Lenses (including Anamorphic Lenses), Zoom Lenses, and Special Lenses (including Macros, Tele-Extenders, Wide-Angle Adapters, ...