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Thread: Good Collimation How-To Resources

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    Default Re: Good Collimation How-To Resources



    Just picked up a laser collimation tool today for my 6in newt-ref. Gave it a go tonight and it took a few tries but was able to get a fairly sharp view of Saturn's rings as well as some nearby stars for testing. I have noticed a tiny amount of jitter in my tracking motors, is there anything I can do to reduce this?
    Jimmy K

    "A still more glorious dawn awaits" - Dr. Carl Sagan.
    Gear: Orion Astroview 6 - stock setup, Orion 20x80 Giants

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    Default Re: Good Collimation How-To Resources

    Jimmy, I'd start with the tripod. Are you using it with the legs fully collapsed? That's best. Any chance of the tripod tips being on other than a good vibration free surface? And, many have good results from hanging a one gallon water/milk bottle from the underside of the mount. Try these and let us know how it goes.

    Clear skies!

    Bob
    6 inch F/5 GEM mounted reflector

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    >)))))*>

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    Default Re: Good Collimation How-To Resources

    Hi all, I'm new here.
    I've been watching the sky with the aid of optical instruments for some time, especially binoculars.
    I recently decided to buy my first telescope, a Newtonian reflector with a 76mm aperture and a 300mm focal length, which creates an aperture ratio of f/3.9.
    I have noticed optical aberrations in the image when looking at brighter objects (mostly Jupiter), at first I thought it would be
    because the lens treatment (the weak lenses that come with the equipment), but the main aberration continued even with better quality lenses (Fully Coated Polssl). I took some pictures of streetlamps where the optical aberration is most preceptable.






    I would like someone to confirm to me that the optical aberration that I have been observing is COMA created by the primary perabolic mirror.

    Sorry, for my English.

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    Default Re: Good Collimation How-To Resources

    Is this image best focus?
    Can you post a link too this telescope, I have never seen one that small with such a fast focal ratio.

    The focal ratio is going to be hard on any eyepiece design, Plossl though good are not designed for this.
    Highly edge corrected eyepieces are required and most likely a paracor or equivalent, both of which are quite expensive.
    Refractors: Antares 105 f/15, Celestron 150 f/8, Stellarvue NHNG 80 f/6.9, TAL 100RS f/10, TS 102 f/11, UR 70 f/10, Vixen SD115s f/7.7
    Mounts: Celestron SLT w/ pier mod & EQ-3 tripod, Celestron hypertuned CG-5 w/ tracking motor & Argo Navis, Manfrotto 028B w/ Stellarvue M2C, Manfrotto 055PRO w/ 128RC, TAL-1 HD EQ, Vixen SXP w/ HAL-130 SXG & half pier
    Diagonals: 2" Astro-Physics MaxBright, 2" Zeiss/ Baader prism, 2" Baader Herschel Wedge (Photo Version), 2"
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    Amici prism, 2" Stellarvue Dielectric, 2" TeleVue Everbrite
    Eyepieces: A-Z

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    The weakest link in the optical chain is the large nut located directly behind the
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    / camera. - Gabrielle

    Ya gotta keep this Apo/
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    thing in some balance of perspective. Apos are awesome, but long focus Achros aren't that far behind them - Siriusandthepup (CN)

    Refractors kick arse precisely because they don't hide behind excuses. That is, they have no obstructions to hide behind. - Jon Isaacs (CN)

 

 
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