Re: What is the Meade LX200R?


"nytecam" <nytecam.21d4xn@xxxxxxxxxxxxxxx> wrote in message
news:nytecam.21d4xn@xxxxxxxxxxxxxxxxxx
>
> It works at f/10 and looks like a regular LX200 so is it more than a
> wide-field RC corrector plate? Intregued! See
> www.telescopehouse.co.uk/
>
> Nytecam 51N 0.1W
>
>
> --
> nytecam

Meade don't say an awfull lot about the RC design. A search dug this up
though. Thought it might be worth sharing?

http://www.astronomy.com/asy/default.aspx?c=ss&id=9

Ritchey-Chrétien
This telescope design was developed jointly by American optician George
Willis Ritchey (1864 - 1945) and French optical designer Henri Chrétien
(1879 - 1956) in the first decade of the 20th century. These two telescope
designers found that the lower the amplification factor of the secondary
mirror, the flatter the field. The Ritchey-Chrétien system has a secondary
mirror that magnifies 2.7x, whereas the Schmidt-Cassegrain design has a 5x
secondary. The Ritchey-Chrétien design is coma-free, whereas the
Schmidt-Cassegrain is not. Ritchey-Chrétien telescopes have hyperbolic
primaries and secondaries that correct for coma; production-type
Schmidt-Cassegrains use a spherical primary and secondary and do not correct
for coma. Finally, the Ritchey-Chrétien design has two optical surfaces. All
Schmidt-Cassegrains have four. Why are Schmidt-Cassegrain telescopes more
popular (by far) than Ritchey-Chrétiens? One word: price. A Ritchey-Chrétien
telescope is quite costly to produce and, therefore, expensive to buy.

Regards


Chris












.

Relevant Pages

  • Re: LX200R
    ... Ritchey-Chretien telescope. ... RC scopes advantages over standard SCT is flat field, no mirror flop, ... secondaries, and relatively long focal length primaries, have a _flatter_ ... Think of the design as an 'SCT-GT', ...
    (sci.astro.amateur)
  • Re: New MEADE scope: RCX400 RITCHEY-CHRETIEN
    ... 2002 Meade's engineers set out to design a telescope ... After carefully evaulating the merits of every telescope design, ... MULTI-PORT CONTROL PANELS ...
    (sci.astro.amateur)
  • Re: Meade Jan 3rd announcement
    ... 2002 Meade?s engineers set out to design a telescope ... After carefully evaulating the merits of every telescope design, ... spikes that degrade image contrast and resolution. ...
    (sci.astro.amateur)
  • Re: MEMO to Meade: How to write an honest news release
    ... > Didn't you release an F14.6 mak cass with an aspheric primary. ... No one at Meade has come up with a new design. ... and we can now charge apo prices for them. ... "There is no direct comparison to any other telescope. ...
    (sci.astro.amateur)
  • Meade RCX telescope design - Is it based on the Palomar 60-inch?
    ... the true optical nature of the Meade RCX telescope design. ... design a variation of the Palomar 60-inch RC Cass, ... Palomar 60-inch telescope then being built, and I took pains to read his ...
    (sci.astro.amateur)