With the advent of auto focus varifocal zooms have become more the norm,
even though the shift is often small, in previous eras, the mark of a
good zoom was that it didn't shift the focus plane as it zoomed, unless
it was specifically noted.
On 3/21/2015 5:21 PM, 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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