Final answer:
A 35mm camera is a professional-grade camera suitable for movie theater films and involves adjustable focusing for different object distances. Calibration for focus using a 50.0 mm lens can be determined through optical formulas.
Step-by-step explanation:
A 35mm camera is often associated with professional photography and filmmaking. Regarding the given options:
A) When comparing 35mm to 16mm cameras, the cost can vary widely based on make, model, and features, so it cannot be conclusively said that one is generally less expensive than the other.
B) A 35mm camera is typically a preferred choice for films that are intended to be shown in movie theaters due to its high image quality.
C) 35mm cameras are indeed considered professional-grade and are used by both amateurs and professionals alike.
When you focus a camera, you adjust the distance of the lens from the film or sensor to ensure that light rays from different distances converge sharply on the film or sensor plane. A fixed lens-to-film distance cannot accommodate the different converging points needed to focus objects at various distances, hence the need for an adjustable focus.
If a camera with a 50.0 mm focal length lens is used to photograph a person standing 3.00 m away, the adjustments required for focus and the resulting image coverage can be calculated using the principles of optics, such as the thin lens formula. Such calculations prove invaluable in determining the proper setup for capturing the intended photographic composition.