>
> >
> > When reading opinons on tripods in various nature photography books,
> > most authors did not desire leg braces as they made the tripod placement
> > difficult on uneven surfaces. From an engineering standpoint, leg
braces
> > should reduce the vibration problem, at least at lower vibration
> > frequencies. I have a somewhat heavy Manfrotto 3001 which does not have
> > braces, as well as a much lighter Ambico V552 which does have braces.
> > Neither one has shown any noticable vibration problems.
> >
> > But, both of these documents are discussing tripods for fairly heavy
> > astronomical telescopes where very long exposure times are an issue, so
any
> > tendency towards virvration would be a problem for astrophotography.
> >
> > Chris
> >
>
> Hi Chris,
>
> I had been very happy with a lightweight Gitzo CF tripod for several
years.
> I mounted a Zuiko 1000mm on it in a windy location. The image bounced
around
> so much it was difficult to frame the scene without holding the camera
still
> with my hand. The same tripod had previously routinely given excellent
> results with a 400/4 Tamron + 1.4x teleconverter. I've never understood
why
> the results were so very dramatically different.
>
> Recently I mounted a 500/4 cat lens on my new heavier CF tripod. With 10x
> live view I again saw more movement than I am willing to accept. I think
the
> problem this time was the geared head I was using. I'm going to try again
> with the Acratech ball head I've been very happy with.
>
> Your mention of the braces between the legs gives me something to think
> about. The main thing I started wondering about due to the article was
that
> a twin-shank leg(typical of a wood tripod) would be much more resistant to
> twisting about the center axis of the tripod.
>
For long lenses I stick to those that have a tripod ring, such as the
older Vivitar 400/5.6 TX and the 75-260mm TX zoom (both available as T4
also). I do so in order to reduce stress on the camera body when using a
tripod or pistol grip, and I suspect that having the camera/lens mounted
near the centre of gravity would have some influence on the tendency towards
wibration just as much as the construction and materials of the tripod.
But, I'm only hazarding an educated guess here.
Chris
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