What is the three-step process used to focus a zoom lens called?

What is the three-step process used to focus a zoom lens called?

• A. Zoom technique
• B. Focus shift
• C. Pre-focus
• D. Depth focus

Answer: (C)

The correct answer, which identifies the three-step process used to focus a zoom lens as "pre-focus," is significant because it refers specifically to the technique of setting the focus in advance before operations, ensuring that the subject is sharp and clear when framed within the shot. This is particularly important in dynamic filming situations where the framing may change quickly. In the context of zoom lenses, pre-focusing involves adjusting the focus according to the distance of the subject within the camera's frame, allowing it to maintain clarity regardless of the lens's zoom level. The other terms, while potentially relatable to focus or zoom functions, do not accurately describe this specific technique or are not recognized terminology in filmmaking.

The correct answer, which identifies the three-step process used to focus a zoom lens as "pre-focus," is significant because it refers specifically to the technique of setting the focus in advance before operations, ensuring that the subject is sharp and clear when framed within the shot. This is particularly important in dynamic filming situations where the framing may change quickly.

In the context of zoom lenses, pre-focusing involves adjusting the focus according to the distance of the subject within the camera's frame, allowing it to maintain clarity regardless of the lens's zoom level. The other terms, while potentially relatable to focus or zoom functions, do not accurately describe this specific technique or are not recognized terminology in filmmaking.