I'm inclined to suggest that:
The precision for an accurate infinity focus increases the costs of a lens.
May not be possible on a zoom lens.
Manual focus is not used by the vast majority of people who buy cameras, so
it's added cost for a feature that is useless to most of the customers who care
more about price.
Ralf R Radermacher wrote:
Am 21.03.15 um 22:15 schrieb Larry Colen:
I have often wondered if some zoom designs shift their point of focus at
different focal lengths.
They definitely do. Otherwise one couöd zoom in, focus much more
precisely and zoom out again. You'll admit that this would be far too
easy...
Ralf
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