>In a message dated 98-09-18 11:51:20 EDT, you write:
>
><< Paul Schings wrote
> <<I have Olympus 7mm, 14mm, and 25mm tubes. All are automatic diaphragm. I
> think
> the older tubes ar non-automatic. Not sure when the switch was made.>>
>
> This is the first I heard mention of a non auto tube from Olympus, except
> that I have a 7mm non auto that I picked up with a 25mm auto, from an Oly
> bin at a camera store.
> Am I correct in thinking that the non auto tube will create less vibration
> than an auto?
>
> Charlie Loeven
> >>
>I have a set of non-auto Zuiko extension tubes (7, 14, 25). Found them on the
>web. They're not quite as convenient as auto tubes but at $15 who can
>complain. I suppose there's less vibration but is it in any way significant?
>This is a valid question, by the way.
>Ed
>
The auto tubes do not have a diaphragm. They just provide a linkage from
the camera to the auto diaphragm in the lens. I can't imagine that the
diaphragm supplies any vibration when compared to that created by the
shutter and the mirror.
Winsor
Winsor Crosby
Long Beach, California
mailto:wincros@xxxxxxxxxxx
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