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  1. #1
    Mike's Avatar
    Mike Guest

    Default refractor design



    How does overall design of an OTA affect performance? Can you have
    a top quality ED objective with a medium standard 3 or 4 baffled system and
    still
    get excellent returns? The light path is what matters. Should it be an
    issue if that path
    is passing through 3 baffles or 6 assuming that the interior of the OTA is
    as black as you can get it?
    And what about the focuser barrel? As long as it is of rack and pinion
    design.

    My point is, can you put a porche engine into a 73 volkswagon and still go
    fast?




  2. #2
    Jon Isaacs's Avatar
    Jon Isaacs Guest

    Default refractor design

    >My point is, can you put a porche engine into a 73 volkswagon and still go

    Your analogy is probably a good one. When you put a Porche engine in a 73 VW
    is a car would have some pretty impressive straightline performance but that
    would be all over the road, would not have enough suspension or braking to
    handle the engine and in general just a road hazard.

    Good optics requires good mechanicals to make them reach their full potential.

    jon



  3. #3
    Jim Beam's Avatar
    Jim Beam Guest

    Default Air spaced Refractor Versus Other Techniques

    I am thinking lately about making a Manwich spaced APO,
    but not sure, there are many sauces and spices in Manwich ,
    and should I add beef to lens or not?

    I know Roland say "No beef in my lenses, no beef", but I
    do not think he is spacing with Manwich, I think his lens
    are Mazola spaced.




  4. #4
    Jim Beam's Avatar
    Jim Beam Guest

    Default Air spaced Refractor Versus Other Techniques


    My friend says he can control his AP900 with PDA, like Palm Tungsten, but I cannot give up on my dream to control my AP1200 with my Intellivision. I think the Intellivision hand paddles are ahead of their time and the cartridge interface is perfect. I have crafted a series of 27 cartridges so far, which cover almost 30 objects in the region between Pollux and Castor.


  5. #5
    Mike's Avatar
    Mike Guest

    Default refractor design


    potential.

    You haven't explained why. I need to know why.



  6. #6
    Mike's Avatar
    Mike Guest

    Default Air spaced Refractor Versus Other Techniques


    "Jim Beam" <jb@brewme.com> wrote in message
    news:UMqdnVakIZMGuEndRVn-tA@giganews.com...
    I cannot give up on my dream to control my AP1200 with my Intellivision. I
    think the Intellivision hand paddles are ahead of their time and the
    cartridge interface is perfect. I have crafted a series of 27 cartridges so
    far, which cover almost 30 objects in the region between Pollux and Castor.

    I think you need lithium real fast. Bipolar disorder has nothing to do with
    polaris!



  7. #7
    CHASLX200's Avatar
    CHASLX200 Guest

    Default refractor design

    >Subject: Re: refractor design
    *****************************
    You also need super seeing for good optics...

    Chas P.

  8. #8
    Jim Beam's Avatar
    Jim Beam Guest

    Default refractor design

    "Mike" <mik@yahoo.com> wrote:

    Baffles dont make images, lenses do. Baffles hide partially illuminated tube walls from your sight. 3 baffles, 6 baffles, a million baffles. You want the least amount of baffles that do the job: hide the tube wall from your sight. Once the tube wall is hidden, extra baffles accomplish nothing.

    Crappy refractor hardware (like Synta makes) generally works for holding an eyepiece in the approximate position for good viewing, refractors are pretty forgiving at Synta type magnifications. Throw a chromacor in the mix and Syntas generally inferior hardware quality is no longer enough to hold the entire system in collimation adequately.

    Good hardware, like an Astro-Physics refractor, holds the lens and focuser in very precise alignment, this lets you get the most out of everything, like seeing concentric fresnel rings in star tests at 400 - 600 power. Super high power reveals more subtle problems and errors. If you have a Synta, you probably aren't going to be viewing planets at 400x anyway, so again the lower quality level of their components isn't much of an issue. If you've got a $4500 lens up front on the other hand, then it's nice to have everything held in alignment and concentricity as only a well built refractor can do.

    JB


  9. #9
    Jon Isaacs's Avatar
    Jon Isaacs Guest

    Default Air spaced Refractor Versus Other Techniques

    >

    Actually Polaris is a nice binary systems..

    jon

  10. #10
    CLT's Avatar
    CLT Guest

    Default Air spaced Refractor Versus Other Techniques

    "Mike" <mik@yahoo.com> wrote in message news:6YYAc.4752$7d2.1462@clgrps13...
    but
    I
    so
    Castor.
    with

    Naw, look at his name. "Jim Beam" is what he was drinking before he posted.

    Clear Skies

    Chuck Taylor
    Do you observe the moon?
    Try http://groups.yahoo.com/group/lunar-observing/
    And the Lunar Picture of the Day http://www.lpod.org/
    ************************************



 

 

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