A: A vari-focal lens has the ability to change focal lengths much like a zoom lens. However, there are two major differences between a vari-focal and zoom lens. The most vari-focal lenses are more compact in size and they do not have the ability track (maintain focus while changing focal lengths).
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A: A vari-focal lens has the ability to change focal lengths much like a zoom lens. However, there are two major differences between a vari-focal and zoom lens. The most vari-focal lenses are more compact in size and they do not have the ability track (maintain focus while changing focal lengths).
