Re: [William Optics] Re: Diagonal question for William Optics Zenithstar II ED 80 APO
- Personally?.. Dialectric is the way I go.. quartz is nice...but is the difference worth it?... I don't see itThen again I am mainly Astrphotography.. but I used a standard Williams Dialectric and loved it on my CPC1100, Nextstar 11, 8" SCT and several refractors.. no issues..Good luck\Dave
Thank you again, Dave.
--- In William-Optics@ yahoogroups. com, "Dave Y" <daveyates80@ ...> wrote:
>overcoat and coatings are exactly the same.. the substrate or Black of material thatâs comprised the mirror is the quartz part.. the actual mirror surfaces are the same
> NO.. The aluminized
> Subject: Re: [William Optics] Re: Diagonal question for William OpticsZenithstar II ED 80 APO
> Thank you
> therefore means also is more easier to clean without leavingscratches...
><daveyates80@ ...> ha scritto:
> --- Sab 30/1/10, Dave Y
> Da: Dave Y
> Oggetto: Re: [William Optics] Re: Diagonalquestion for William Optics Zenithstar II ED 80 APO
>Data: Sabato 30 gennaio 2010, 17:57
>I have used all my William optics diagonals on every scope I have ever owned.. no worries.. I have also seen astrotech, Televue, orion, etc used on Williams scopes.. no issues..
> Quartz is more temp stable than class.. wont movein temp changes...and will not alter its shape... Quartz is rock and is a solid.. glass is technically a liquid and flows.. very slowly but it does flow,,, distort and sag.. Quartz will not... itâs a solid and will keep shape, figure and surface indefinately.
> Cheers11:45 AM
> From: Frank.Tomaras@ Cgi.Com
> Sent: Saturday, January 30, 2010
> To: William-Optics@ yahoogroups. comOptics] Re: Diagonal question for William Optics Zenithstar II ED 80 APO
> Subject: [William
> Timm, Stuart,
> Thanks for your
>justification to this appearing on Khan's web site -
> That's about what I figure too, but there must be some
>send the inquiry to Khan and see what he says.
> I will
>(1992) Celestron and my Televue diagonal on my refractors, Sct and Mak with no problems.
> I have used my
><s.k.m.r@ > wrote:
> ------------ --
> --- In William-Optics@ yahoogroups. com, STUART ROSS
> >yahoogroups. com
> > Frank
> > I use a Televue 2" with my ZS80II and it works just fine.
> > Cheers
> > Stuart
> > ____________ _________ _________ __
> > From: Timm B <t.bottoni@ ..>
> > To: William-Optics@
> > Sent: Saturday, 30 January, 2010 10:42:38Zenithstar II ED 80 APO
> > Subject: [William Optics] Re: Diagonal question for William Optics
> >behind that one to be honest.
> > Ã
> > Hi
> > Absolutely Not True - Not even sure what the logic would be
> >price/performance ratio of the WO diagonals, they are hard to beat. I have two of the 2" dielectrics, and they are exceptionally good for the money.
> > But with the
> >yahoogroups. com, Frank.Tomaras@ ... wrote:
> > Timm
> > --- In William-Optics@
> > >Zenithstar II ED 80 APO and he read somewhere that other major brand non-WO diagonals are specifically NOT recommended for WO refractors.
> > >
> > > A member in our club recently bought the William Optics
> > >(no reason was specified)
> > >would anyone know why?
> > > If this true,
> > >
> > > tks
> > > Frank
> > >