Re: [ATM] Telescope Mounts

[George Anderson <georgea@cam.org>]

Ahhh, but can your scope and mount handle a 60 to 120 minute exposure
with a 4" by 5" film plate and show no mount related errors or field
rotation? As well as provide a flat focal plane over a large area?
Those large alloy castings and oversized bearings were used for a
reason, film is a very unforgiving medium when trying to accurately
record the night sky over long exposures.
Fast "film" (probably kodak type 103 plates) probably had a speed of
around 100ASA max.

George Anderson
Montreal Canada

Cleak skies and good health

Kevin Whitefire wrote:
> 
> That looks like it weighs as much as a small car.  I
> think my scope and mount tops the scales around 70
> pounds or so.  Less when I change things around to
> aluminum and weldings.
> 
> Kevin
> --- Mark Holm <mdholm@telerama.com> wrote:
> 
> > This first link shows a non-B&C optic tube on a
> > refurbished B&C mount.
> > (Temporary setup at the refurb shop.)  You can see
> > the large diameter
> > polar bearing housing and the long, large diameter
> > polar axle
> > extension.  With that extended polar axle, the tube
> > never collides with
> > the pier.  The scopes were mostly Cassegrain, so the
> > fact that the long
> > mount puts the top of the scope way up in the air
> > wasn't so much of a
> > problem.
> >
> >
> http://www.abengineering.com/projects/bollerchivensretrofit.htm
> >
> >
> > This second link isn't as good a picture, but it
> > shows a B&C optics tube
> > on a B&C mount.
> >
> > http://www.chara.gsu.edu/HLCO/bnc16/
> >
> > B&C made scopes in the 16 - 40 inch range for
> > colleges and research
> > observatories.  These were serious research
> > instruments, solidly built
> > with routine, professional use in mind.  Real
> > workhorse instruments.
> >
> > It is not uncommon for colleges or research
> > observatories to lose
> > interest in an old instrument, even though it is
> > still basically in good
> > condition.  When that happens, an amateur club can
> > often get a scope
> > just for the cost of hauling it away.  These B&C
> > scopes were well built
> > to begin with.  It wo
> > uldtakealotofabusetorenderoneunfixable.
> >
> > Mark Holm
> > mdholm@telerama.com
> > _______________________________________________
> > ATM mailing list http://www.atmlist.net/
> >
> 
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