Re: Another OA Reflector

From: Jon Isaacs (jonisaacs_at_aol.com)
Date: 10/07/04 

Date: 07 Oct 2004 00:02:06 GMT

>The OTA is $649, and the focal length is 1240mm (f/13.6). The weight is
>48.8 pounds, including the SkyView Pro equatorial ($999 for OTA and single
>axis drive, $1048 with dual axis drive).

>Clear skies, Alan

Thanks for the information Alan.

At F13.6 this is a long scope and its only a 91mm scope. I don't see it as a
big seller, what with their 100mm F9 APO only about $350 more and the ED-80
considerably less.

And then Dan's offerings are something around F11 I think which would seem to
be more attractive as well. Orion would seem to be snaking in on Dan's market
but I doubt that they will do as nice a job and they will probably stay small.
------------------

Looking at the photo of the Orion Scope it looks to me like they put the
secondary mirror on the other side of the OTA from the focuser. This seems
wrong to me as it means the secondary has to be much bigger to achieve
reasonable illumination, one of the advantages of the OA Newt is that the
focuser can be quite close to the secondary. This seems to be the way the DGM
scope is designed.

????
-------------

As far as Chas P. goes, well a 10 incher at F11 would need to have been cut
from a 25 inch mirror (something like that) and would be over 9 feet long....

Jon

Relevant Pages

  • Wireless Remote Controlled Switchbox
    ... Like many scope owners I have scopes I piggy-back on my main OTA. ... my mount only has 1 focuser port. ...
    (sci.astro.amateur)
  • Re: Feedback on Antares Refractors?
    ... I really the scope and the fact that it was under $600. ... I didn't experienced pinched optics ... > I was able to collimate the focuser ... > to collimate wrt the objective lens, then I'd love this scope for its low ...
    (sci.astro.amateur)
  • Re: Intes MN-66 tune up
    ... so I spent the afternoon replacing the focuser on ... cap screws and I'm ready to collimate. ... Since I bought the scope second hand, ... defocused star image at 130x. ...
    (sci.astro.amateur)
  • Re: Saturn 2005-10-17
    ... > Second - make sure your scope is collimated properly. ... > focuser) move back through focus again. ... I realised I needed the Barlow to get any chance of a decent ... size image of Mars at all. ...
    (uk.sci.astronomy)
  • Re: Opinions on Meade truss-tube Dob?
    ... I felt the scope could have handled more ... Don't plan on setting the OTA (off the mount) onto its tail bone. ... It was necessary to remove a small roller-bearing from the azimuth ...
    (sci.astro.amateur)