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Varifocal lenses provide a flexible solution to applications that
previously would have required multiple fixed focal length lenses.
Simply adjust through the indicated focal length range for the
desired field of view, within the specified working distance range,
and then set focus for best image. Due to the variable focal length
range, varifocal lenses are also known as vari-focal,
variable-focus, or multi-focal lenses. Varifocal lenses can select
the focal length within the specified range like zoom lenses, but
unlike a zoom lens focus adjustment is needed after setting of the
focal length. They have a different, simplified optical and
mechanical design that is more cost-efficient to produce than zoom
lenses. The focal length adjustment is typically a middle or rear
assembly of elements that slides back and forth, whereas the
separate focus adjustment is typically a front cell movement. |
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