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    Default I bought my first scope: Celestron Onyx 80ED



    Hi All

    Long time no see. Happy new yr to everyone. just letting u know that i finally bit the bullet and after much search and agony I surprised myself and went with a scope that came into my list in the last minute. The Celestron Onyx 80EDT. Read good stuff about it and got it at a great price from the US.

    It is a f/6.25 so im now searching for the right EPs and a barlow. not sure what mm to start with. thinkin 3 EPs and a 2X barlow will do for a range of planet, lunar and stars.

    Diagonal will be the WO CF 2".

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    Default

    Hi there Ncrwaw.
    welcome back to the forums and Happy New year!

    awesome stuff you finally have a scope now thats the best feeling when wishing to see the stars!

    It looks like a great refractor for viewing, portability and even astrophotography. Saw some great shots with this scope.

    Let me know what mount you got with your new baby Did it come with any accessories? Also would love to see a first light review of your scope and some photos!

    I will ask the great EP members about your eyepiece question.
    Name: Gus OTAs: ED 100 PRO refractor, Orion ST80 (not the CF), 8" Dob stuck in Canada Mounts:HEQ5PRO Synscan mount, Manfrotto Tripod CAMS: Guidecam Philips SPC900 webcams (4), Canon unmodded-450D DSLR

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    Default

    Hi Vin,

    I sure will do as soon as i get it. The mount is the HEQ5 Pro and i rem at the time u told me about some EPs in a pm so il check those out. But is there a certain mm i should look for for my focal length ratio. The Oynx has a f/6.25?

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    Default

    Hi Ncraw,

    Congratulations on your purchase of the Celestron Onyx 80EDT refractor telescope.

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    Default

    Congrats Ncraw! Woo Hoo!

    I'm still waiting for that first scope, but the Onyx 80ED is one I've considered. I'll definitely be watching for the "First Light" report..

    Mike

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    Default

    Well, Im not Vin lol, but the EPs depend on what you want to observe. For DSOs (clusters, nebulas) you will need to use EPs of low magnification 25mm, 30mm, and so own. For planetary its the other way around, you will need EPs of higher magnification, 10mm, 9mm, and so own. In your case the highest useful manification will be around 167x or so. That will go by using an EP of 3mm. Just remember that when you get new EPs, make sure that they do have a good eye relief.


    Quote Originally Posted by Ncraw View Post
    Hi Vin,

    I sure will do as soon as i get it. The mount is the HEQ5 Pro and i rem at the time u told me about some EPs in a pm so il check those out. But is there a certain mm i should look for for my focal length ratio. The Oynx has a f/6.25?
    Joel

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    Default

    Quote Originally Posted by Ncraw View Post
    Hi All

    Long time no see. Happy new yr to everyone. just letting u know that i finally bit the bullet and after much search and agony I surprised myself and went with a scope that came into my list in the last minute. The Celestron Onyx 80EDT. Read good stuff about it and got it at a great price from the US.

    It is a f/6.25 so im now searching for the right EPs and a barlow. not sure what mm to start with. thinkin 3 EPs and a 2X barlow will do for a range of planet, lunar and stars.

    Diagonal will be the WO CF 2".
    Hi Martin. Good to see you back and happy new year to you as well

    Nice choice of scope, especially if you whack a DSLR on the back.

    Yes I can highly recommend the WO 2"CF . I have three of them, well two 2" and a 1.25"

    How much do you want to spend on EPs?

    My favs for the ED80 (although mine at f/7.5 is a bit longer than the Onyx) are the Vixen LVWs in 17mm, 13mm and 5mm

    or you could come back to Baader Hyperions in the same sizes

    or basically try for anything with a nice 65° to 68° AFOV

    or cut out the 13mm and go 17mm and 6mm. Just always seems a shame to put ordinary EPs and barlow on a nice Apo, and you can always carry the EP's over from scope to scope

    Do get an ED barlow. There are plenty of choices out there at quite reasonable prices in the 2" size. Mine is a generic "house brand" and works fine, but yeah make sure it has ED glass

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  11. #8
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    Default

    Thanks guys, I will start researching some prices shortly. A quickk question guys, how do you claculate the maximum useful magnfication and how do u select the EP's mm? i mean will say 4mm give you out of focus while a 3mm will be in focus.

    I dont wear glasses but i will still look for a good eye relief and also good FOV.

    Apart from this what book do you recommend for southern skies and i think i will need a red light and a chart?

    Many thanks

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    Default

    Hi Martin

    IMO this is the book for Aus/Nz beginners (or for us southerners at any level for that matter)

    Atlas of the Southern Night Sky

    The maximum magnification of a scope (and this is a rough guide only) is twice its aperture in mms, so your 80mm scope maxes at around 160x.

    The Focal Ratio (f number) is the scopes Focal Length (FL) divided by its aperture

    In your case you have an 80mm scope at a FL of 500mm or an f ratio of f/6.25

    The magnification for a given Eyepiece (EP) is the FL of the scope divided by the Eye Piece Focal Length (EPFL, thats the number in mms for that EP)

    So for your scope a 17mm EP gives 500 divided by 17 equals 29.5x

    A barlow muliplies the magnification by the number that it is rated at

    Therefore a 2x barlow with the 17mm EP in your scope will give 59x

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    Default

    Sweet!! thanks Vin.

 

 
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