DSLR Lens Buyer's Guide

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DSLR Lens Guide -Which lenses hold focus through the zoom range?

aparke's picture

Not mentioned here, nor mentioned by manufacturers specs, which of these zoom lenses hold focus through the zoom range of the lens?  Video and film lenses must hold focus. Still lenses do not as the autofocus sets focus at a given focal length before shooting.  Video lenses must focus during the shot.  In my experience almost all of the still photo zooms shift focus when zooming, even some very high end lenses.  Please apprise us of what lenses to look for that can hold focus while zooming.  Especially in the wider zoom ranges like 10:1 which are needed for documentary work or event videography.  Thank you.