Ken, my experience does not agree with you on this point -
I have used about a dozen Canon EF-series zoom lenses, and every
single last one of them, from the cheap kit lenses, to the monstrously
expensive 28-300mm L IS USM, maintained a constant focus distance
regardless of focal length.
On 11 Jun 2009, at 4:11 PM, Ken Norton wrote:
> Most modern lenses are zoom lenses. Most zooms now are a form of
> "Varifocal"
> design. As such, you cannot zoom in on a subject, manually focus (or
> focus
> lock) and zoom back out and expect the focus to stay put.
--
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