Re: [ATM] Stereo view

["Arjan te Marvelde" <arjan.te.marvelde@hetnet.nl>]

Eric,

Surely the technological challenge is a valid reason, but to know, while
grinding two mirrors, that an equal effect could be reached with a viewer
(and a bit larger mirror) would discourage me a little.
I hadn't thought of the smaller field of view you'd get though, good point.
Are splitters really that expensive? It doesn't seem much harder to build
than a dual secondary/tertiary construction?

thanks,
Arjan

----- Original Message ----- 
From: "Eric Royer" <eroyer-liste@9online.fr>
To: "Arjan te Marvelde" <arjan.te.marvelde@hetnet.nl>
Sent: Monday, 07 February, 2005 18:35
Subject: Re: [ATM] Stereo view


> I made a 6 inch binoscope and I use it a lot. There is no doubt that
> viewwing with two eyes is much more comfortable than using just one.
> Now, there are two possibilities to enjoy binocular viewing : either
> build a binoscope or buy a binoviewer. I used a binoviewer just once at
> a star party on a 16 inch scope. Both methods give great views. However
> there are several reasons to choose a binoscope over binoviewer :
> - the pleasure to make it yourself (We are on the ATM list, aren't we ?)
> But maybe there's a way to make a binoviewer as well.
> - for a given light gathering power, the field of view is larger in a
> binoscope. A 150mm (6 inch) binoscope gives as much light as a 210 mm (a
> bit more than 8 inch) scope with a binoviewer. If you assume a 7mm exit
> pupil, the binoscope has a minimum magnification of 21x. The larger
> scope has a minimum magnification of 30x.
> - cost : the whole 6 inch bino costs less to build than a binoviewer
> alone (and you need a telescope to use it).
>
> There are some important advantages of a binoviewer with a bigger mirror:
> - you can use it on several scopes.
> - better resolving power.
>
> Both methods for using two eyes work well and in my opinion any of the
> two is much better than using only one eye.
> Eric
>
> Arjan te Marvelde wrote:
> > A question about binoscopes:
> > I was wondering wheter the stereoscopic aspect of binocular viewing has
> > anything to do with the acclaimed better results. This can hardly be the
> > case, since even with a bino-scope the eye-base is nothing compared to
the
> > object distance. So the effect must be in your head, where the nervous
> > system does some smart signal processing with the dual light source.
> > But if this is the case, why are so many people going through the hassle
of
> > making a complete double telescope, while just a binocular eyepiece
would
> > suffice?
> > Who knows the answer?
> >
> > Arjan te Marvelde
> >
> > _______________________________________________
> > ATM mailing list http://www.atmlist.net/
> >
> >
>

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