 
Technique tip: handling zoom lenses
There are four important techniques to keep
in mind when using a zoom lens.
1. With a two touch lens focus carefully at the longest focal length
before zooming back to the image size you want.
2. With a one touch lens zoom first and then focus in order to minimize
focus shift.
3. As with almost any lens, close down two or three stops from the
maximum opening, if possible, for the best optical performance.
4. Treat longer zooms like unifocal telephotos; use a tripod or, when
hand-holding, use the fastest shutter speeds.
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More about zoom lenses
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Focal Length Range of Zoom Lenses
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Tips about Zoom Ratio
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Standard or Macro Focusing
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Zoom Lens Consideration
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Tips on Handling Zoom Lens
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Advantage of Zoom Lens vs Unifocal Lens
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Disadvantage of Zoom Lens vs Unifocal Lens
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