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Thread: Meade 2080 Optics Question

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    Default Meade 2080 Optics Question



    I have an old, 1984 +/- Meade 2080 SCT, which I bought last year on eBay. I had the silvered secondary stripped and recoated, and after reassembling and collimating the optics, have enjoyed the scope greatly over the past six months.

    However, I am a bit of a perfectionist. Despite the diffraction rings being a nicely centered, symmetrical "doughnut" both inside and outside of focus, just before I bring a star image into focus with a moderate to high powered eyepiece I notice that one side of the "doughnut" brightens more than the rest. What could be the cause? I'm certain it is not a collimation issue and the eyepieces I use are excellent orthoscopics.
    Gordon
    Scopes: Meade LX10 8" SCT, Explore Scientific AR102 Refractor on ES Twilight 1 Mount, Oberwerks 15X70 Binos, Orion 10X50 Binos.
    Eyepieces: ES 68* 24mm, ES 68* 20mm, ES 82* 11mm, ES 82* 8.8mm
    Observing: Messier Objects--110/110, H1 Objects-- 400/400. Hundreds of NGC Objects. Significant Comets: Kohoutek, West, Halley, Hyakatake, Hale-Bopp, McNair. Transits of Mercury and Venus.
    2017 Total Solar Eclipse

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    Default Re: Meade 2080 Optics Question

    It's hard to say. But the thing is, the "donut" tells you nothing. What matters is the appearance of the diffraction rings when you are just barely out of focus.

    At any rate, if the Moon and planets look good, stop worrying and just enjoy your telescope.
    Arctic and Rogan like this.
    Uncle Rod

    Uncle Rod's Astroblog: http://uncle-rods.blogspot.com/

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    Default Re: Meade 2080 Optics Question

    Thanks, Rod. The scope works very well for DSOs, which are my primary interest, and decent--but not razor sharp--on planets. Up here, great transparency is common, but great seeing--not so much. Diffraction rings are concentric, but there is a bit of a squeeze just as the a star is brought into focus. No biggie, as I enjoy the scope and only have about 200 bucks invested in it.

    By the way, I recently discovered your blog, as well as your excellent writings on SCTs, and enjoy them very much.
    Gordon
    Scopes: Meade LX10 8" SCT, Explore Scientific AR102 Refractor on ES Twilight 1 Mount, Oberwerks 15X70 Binos, Orion 10X50 Binos.
    Eyepieces: ES 68* 24mm, ES 68* 20mm, ES 82* 11mm, ES 82* 8.8mm
    Observing: Messier Objects--110/110, H1 Objects-- 400/400. Hundreds of NGC Objects. Significant Comets: Kohoutek, West, Halley, Hyakatake, Hale-Bopp, McNair. Transits of Mercury and Venus.
    2017 Total Solar Eclipse

 

 

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