A: Zoom lenses have the ability to change focal lengths much like a vari-focal. However, they differ in many ways from a vari-focal. A zoom lens typically offers a wider range of focal lengths and is physically larger than vari-focal. They can be purchased in Manual, 3-motor type, and Auto-Iris versions. They also have the ability to track (maintain focus while changing focal lengths) and can be operated remotely. Some motorized zoom lenses also offer a Pre-Set ability for the zoom, focus, and iris functions.
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A: Zoom lenses have the ability to change focal lengths much like a vari-focal. However, they differ in many ways from a vari-focal. A zoom lens typically offers a wider range of focal lengths and is physically larger than vari-focal. They can be purchased in Manual, 3-motor type, and Auto-Iris versions. They also have the ability to track (maintain focus while changing focal lengths) and can be operated remotely. Some motorized zoom lenses also offer a Pre-Set ability for the zoom, focus, and iris functions.
