Do the push-pull-twist zoom/focus rings help these lenses be any
better in tune than the average trombonist?
RB
On Jul 17, 2010, at 2:16 PM, Bob W wrote:
What is meant when a lens is described as "2 touch," e.g., 35-70 F4
SMC
A (58) 2 TOUCH ZOOM.
it means the zoom ring and the focus ring are separate. Some lenses,
such as
the 70-210/4, use the same ring for both - to zoom you push/pull like a
trombone, to focus you twist
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