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Thread: Collimanating an SCT

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    Default Collimanating an SCT



    So for those of you who like to visit the EP forum you no doubt have seen that I have once again reached the 'paralysis by analysis" point in trying to select my first premium EP ... 😬 I've decided to go with a 24mm Panopitc .... Ok with that out of the way, the star party I went to on Wed didn't help much in the EP decision but it did show me that my scope is slightly out of collimation. When switching between EPs that were not para focal I noticed all the 'star donuts ' were slightly off center.

    Can someone point me to a good explination for colliminating an SCT?
    Intercepting & temporarily inconveniencing light photons as they travel through the universe since 2017
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    Default Re: Collimanating an SCT

    Collimation Guide for Schmidt Cassegrain Telescopes

    I have always found this useful for collimating my Nexstar 6

    Great choice of eyepiece by the away.
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    Stevie

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    Default Re: Collimanating an SCT

    Here is a little something. It is not hard if you can keep a star centered.
    The 24 Panoptic is on my wish list.
    http://skywatch.brainiac.com/collimation.pdf
    https://youtu.be/hqRVIDj4aZA


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    Default Re: Collimanating an SCT

    Star Rider likes this.
    Celestron Classic 8, Old Sears 60mm f/15 refractor, Old Edmund Scientific 6 inch F/8 newt, GSO 2" Diag, ES 30mm/70, ES 25mm/70, Orion 32 Super Plossl, Mead 24mm MA,
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    Default Re: Collimanating an SCT

    thx guys!
    Intercepting & temporarily inconveniencing light photons as they travel through the universe since 2017
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    Default Re: Collimanating an SCT

    You already got covered on how to collimate. Just make sure that your scope is fully acclimated. I would give at least 3-4 hours.

    When I started using my then brand new SCT I got spooked a few times seeing all sorts of imperfections in star donuts. But then I noticed they would become perfectly round mid session. Now I give at least 2 hours in addition to 1-3 hours of acclimation before checking.

    In 3 years my 8" been used and abused, multiple trips on really bumpy dirt roads. The collimation is still spot on.
    Scopes: Celestron: 8" SCT F10, Omni 150R Achro F5, Onyx 80ED F6.3; ES: 127mm CF F7.5 APO. Mounts: ES Twilight I, Bresser EXOS2, SW SkyTee2, UA MicroStar. Binos: Orion 10x50, Celestron 8x42. EPs: TeleVue: Plossls & barlows; ES: 82os & 68os; Vixen: SLVs & NPLs; Baader: BCOs & Aspherics; EO/UO: HD Orthos; Meade: UWAs & Plossls; Celestron: X-Cel LXs, Luminos; GSO SVs. Filters: Astronomik: UHC; Lumicon: OIII, H-beta, DeepSky; Baader: UHC-S, M&SG, CB; Orion: UltraBlock, SG. DSO tally: 936 (H400-1: 400, H400-2: 152, H300-3: 27; M110: 110, S110: 73). Doubles: 600, Comets: 6, Asteroids: 30
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    Default Re: Collimanating an SCT

    fair enough, however I had setup my scope at about 6pm or so and I was checking near the end of the star party around 9:30pm ... not that I knew I should what a good 3 hrs or so before checking ... better lucky than good any day!
    Intercepting & temporarily inconveniencing light photons as they travel through the universe since 2017
    What do I have? A M.S. degree in AstroPhysics w/minor in planetary geology & SkyNet (an Orion XX14g time machine)
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    UO 4mm Ortho, KK 9mm & 12.5MM Orthos, Delite 7mm, Delos 10mm, 14mm, Panoptic 19mm, 24mm, Baader 8-24mm Mark IV Zoom & a bunch of NV stuff

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    Default Re: Collimanating an SCT

    Mounts: EQ1, LXD55, Atlas EQ-G (one with Rowan belt mod and one without)
    Scopes: C11, 8" Reflector, 102mm MCT, ST80, W.O. FLT98, 6" RC, Lunt LS50THa/B400
    Cameras: Canon XTi, DSI-C, DSI, ST402, QHY8L, QHY183C, QHY163M
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