The Meade diagonal is a 10th wavefront error as the TV. The big
advantage that I like about the TV is the one piece bilot construction
and the 2" slip eyepiece type fitting as opposed to the Meade's visual
back female thread ring. Both use the same diagonal glass as you would
find used in a secondary of a large Newtonian and are full thickness. I
have both diagonals but you can't tell the difference visually only
mechanically. You can exchange mirrors from one holder to the other. If
you already own the Meade I would get it resurfaced and overcoated. If
you have none and want the 2" diagonal I would buy the TV, AP or the
Lumicon. QSP strips, new reflective surface and overcoats your glass.
Meade's glass is not inferior, just the reflective surface is in the >85%
range. Send just the mirror. You can find out more buy contacting QSP.
I was wondering where you are getting your information on the Meade 2"
diagonal, inferior to what?
AV

On Tue, 30 May 2000 22:17:11 MDT "Howard W. Jackman"
> Astroviking, Will QSP simply overcoat the diagonal? or do they
> replace the
> existing mirror with a new one?
> How much will the wavefront error of the 'inferior' Meade 2"
> diagonal matter
> when coated with similar coatings to that of the 'superior' Televue
> diagonal, and is the difference enough to warrant the purchase of
> the TV
> diagonal?
>
> When sending the diagonal to be coated (assuming that they simply
> recoat the
> existing mirror) does one send in the entire diagonal? or just the
> mirror
> itself?
>
> Thanks
> Howard
>
>
>
> >Subject: Re: [M]: TeleVue Everbrite 2" diagonal
> >Date: Tue, 30 May 2000 18:27:48 -0700
> >
> >You can have any diagonal coatings replaced at QSP (they advertise
> in S &
> >T) for about $25 less shipping. You can get the same coatings that
> TV
> >uses or even Military Spec if you want to pay a little extra. QSP
> coats
> >most optics in the industry including Galaxy. If you already have
> a
> >different diagonal it's worth the money to change. If you don't
> already
> >have a 2" diagonal than the TV is a great buy.
> >AV
> >
> >On Mon, 29 May 2000 11:12:46 -0500 "R. A. Greiner"
> > > > Nikolidakis George wrote:
> > > >
> > > > Televue maintains that his low-scatter Everbrite
> > > dielectric-coated
> > > > 2"
> > > >
> > > > diagonal has 99% light reflectivity .
> > > >
> > > > I have on my 12" Meade the 2" diagonal and I thing is not
> well
> > > know
> > > > what is its
> > > >
> > > > light reflectivity. Some say that is about 85 %. If that is
> true
> > > then
> > > > some can gain
> > > >
> > > > 14 % more light power gathering just replacing the diagonal.
> > > >
> > > > That means now my 12" scope is functioning as one 10" .
> > > >
> > > > Das any one in the list is using televue 2" diagonal and what
> > > >
> > > > is his overall impression of this accessory ?.
> > >
> > >
> > > I have one and it is well worth the extra money.
> > >
> > > Doc G <http://www.mailbag.com/users/ragreiner>
> > >
> >
> >________________________________________________________________
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>
>
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