Gord,
At 7:57 PM +0000 1/1/04, olympus-digest wrote:
>Date: Thu, 01 Jan 2004 11:19:20 -0700
>From: "Gordon J. Ross" <gordross@xxxxxxx>
>Subject: Re: [OM] Forbidden Shutter Speeds
>
>Hi AG
>
>I'm sure there is, a quick fix, attach your carry bag or case to the tripod
>once its setup- it adds weight, dampening and stability. I like light gear,
>and I may get dumped on but I was looking at buying a Manfrotto 159PRO with
>a 141RC Head, but although less stable, the Velbon 'Sherpa 250' was more
>what i wanted to truck around so I bought it at about half the price. The
>geared column has a screw at both ends so I'm trying to devise a bracket
>that I can use on the bottom of the column to attach my carry case as
>ballast- any ideas on this, or is there already something I can use?
I think I've seen a gizmo that does this, being a hook that screws onto the
bottom 1/4-20 screw.
There is also a standard bit of hardware called an "eye nut", which looks like
a metal loop welded to a nut. I did a Google on " 'eye nut' 1/4-20", and found
for instance <http://www.smithfast.com/regeyenut.htm> where their part number
C-186A will do the job. There were lots of suppliers listed in the search
results. They cost about US $5 each.
These eyenuts are all drop-forged and quite strong, being rated for at least
500 pounds. The yield strength will be a factor larger. If one wants a hook,
I would just take hacksaw and metal file to one, and make it into a hook. It
will still be more than strong enough to hold any plausible camera bag. (Hook
nuts do exist, but are both uncommon and commonly too large for our purpose.)
The half-remembered photo gizmo may be just a standard eyenut with a new name
and bigger price.
Another approach would be to use a "coupling nut" (like a regular nut, but very
long and used to couple two pieces of threaded rod together) and a "machine
screw eye/hook". These are more common in hardware stores, and can be had in
1/4-20 or 3/8-16 threads. The coupling nut connects the tripod screw to the
screw eye/hook.
>- ----- Original Message -----
>From: "AG Schnozz" <agschnozz@xxxxxxxxx>
>To: <olympus@xxxxxxxxxxxxxxx>
>Sent: Thursday, January 01, 2004 10:04 AM
>Subject: [OM] Forbidden Shutter Speeds
>
>
> > Ah, to start the new year off with real OM content:
> >
> > There is a range of shutter speeds that I generally try to
> > avoid. Namely the 1/30 - 1 second range. When using a tripod,
> > these speeds tend to create vibration induced image degradation.
> >
> > I haven't gotten very scientific on this, but I'm curious if we
> > have specific harmonics being setup with certain combinations of
> > lenses, bodies, winders/mds and tripods/monopods?
There are, but it's too complex and setup-dependent to be very useful. My
approach is to use a big, heavy tripod screwed securely to the camera body or
lens (no rubber pads allowed -- too squishy). It's most important to prevent
angular rotation of any kind. Displacement, unless gross, is far less likely
to cause trouble.
Joe Gwinn
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