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Old Aug 4, 2005, 1:00 PM   #1
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Is it possibnle to make a good focus while your zumming???

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Old Aug 4, 2005, 6:45 PM   #2
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It depends on the lens - in older days of manual focus cameras most zooms hold their focus while the focal lenght is changed (parafocal). With the advance of Auto Focus manufacturers simplify their lens design and the modern zooms loose this capability (varifocal) - Canon is the most notable one at this.

Nikon, Sigma and Tokina still hold dear to this tradition

"Like the rest of the lenses in the AT-X series, The AT-X 242 AF is what is commonly referred to as a parafocal lens, meaning when focus is achieved at a telephoto focal length, it is possible to zoom back to a wide angle and maintain focus on the subject."
http://www.fredmiranda.com/reviews/s...t=40#poststart
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