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Re: (IAAC) Obj: NGC 6751 + small prism
I am looking for one these prisms. A club member had one that I was using,
but it was a gift to him.
Scott
----------
> From: Nick Martin <nmartin@bonnyton.u-net.com>
> To: netastrocatalog-announce@latrade.com
> Subject: Re: (IAAC) Obj: NGC 6751 + small prism
> Date: Tuesday, August 25, 1998 6:56 AM
>
> At 04:44 PM 8/24/98 -0400, you wrote:
> >Sorry been out of town for a few days.
> >
> >>Have you tried for the other bright planetaries in Aquila, NGC 6781 or
> >tiny 6803?
> >
> >Actually I have an observation of 6781 and 6803 to enter. I picked a
couple
> >of objects to enter that did not have any observations entered for them
> >yet. Intestingly I have also been going after some of the fainter
> >planetaries. Has anyone on the list used a O-III filter to verify some
of
> >the smaller planetaries ? Also I had the opportunity to use a special
prism
> >to find a very small planetary last week. It appeared to be three small
> >prisms glues together like this ( ^ V ^). Does anyone have any details
on a
> >prism like this ?
> >
> >Scott
> It sounds like it is a direct vision prism, a very handy object to have
for
> planetary nebulae. It gives a spectrum in line with the axis so you look
> straight through it instead of at an angle.
> The easiest way to use it is to centre the object in the eyepiece, then
hold
> the prism between your eye and the eyepiece apeture. Look straight
through
> the prism. Keep your eye as close to the prism as to can manage without
> sticking it into it. Where did you get it?
> Nick
> Nick Martin, Bonnyton House, By Ayr, Ayrshire KA6 7EW ,Scotland, UK.
> Latitude 55 24'56" Longtitude 4 26' 00".
> "Had I the heavens' embroidered cloths,
> Enwrought with golden and silver light,
> The blue and the dim and the dark cloths
> Of night and light and the half-light, ....."
> He Wishes For The Cloths Of Heaven by W.B. Yeats
>