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There are a limited number of extreme varifocals that go up to about 10:1 or more (for example a 5 - 50mm lens), but to be honest, in some situations you may be better off using a proper zoom lens. It should perhaps be mentioned at this point, that whilst varifocals are increasingly being fitted to cameras "off the shelf" as a complete package, the fact remains that the latest varifocal designs, are significantly better quality than some of the rather poor offerings available in the not so distant past.. So what exactly is the differance between a short zoom and a long varifocal; well its all to do with elements. Any complex lens is actually made up of individual pieces of glass called elements, which are themselves arranged in groups. With a varifocal, one or more fixed groups are moved in relation to another; whereas with a zoom lens, individual elements (lenses) and groups can move to create complex relationships to each other. This latter more sophisticated degree of optical design, does generally produce a much better quality, and more highly corrected approach to achieving top quality images.
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