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  1. #1
    Andyvalver's Avatar
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    Default Eye piece info needed.



    Hey guys. Ive recently bought a celestron 130eq and last night was the first night i got to play with it. First viewing was the moon as most people probably go for that. I was pleased with the results using the 10x eye piece. the moon filled the view of the scope so i had great detail.

    Im just wondering, what whats the next eye piece to get? What do magnification do they go too and where would i get one for my scope?

    I want to get even closer to the stars :P lol

    Edit, also does anyone know where i can get a minolta t piece for my sony alpha camera? I see the t pieces around but they are all for canon and nikon ect..

    Cheers

  2. #2
    Chuck289's Avatar
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    Default

    10x eyepiece? I think you mean 10mm, the focal length of the eyepiece. The magnification of an eyepiece will be different in different telescopes. Divide the focal length of your scope by the focal length of the EP to get the manification.
    So 650mm/10mm = 65X magnifcation.

    Try telescopes.com

  3. #3
    Bob327's Avatar
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    Default

    Andy...

    I just looked up the scope and if I am correct it is a 650 mm f/5 scope... and Celestron lists its highest USEFUL magnification as 300x... BUT remember to get up too 300x you will have to have absolutely perfect seeing conditions which may happen (things do happen you know) once every year or two.... and with a FR of f/5 it should give you a pretty generous FOV....

    I own more then a few telescopes ( well after 50+ years in the hobby I have collected more then a few)... BUT I only use 4 of them on a regular basis... 4 and 5" refractors and 8 and 11" Scts...
    and I can tell you flat out that no matter what scope I am using it is extremely rare for me to actually view above 250x most of my viewing is done between 50 and 200x... and the vast majority of the time I am viewing under 100x (the planets and the moon
    are about the only targets I actually use high magnification on)...

    Your 10 mm eyepiece will give you 65x ... pretty good general magnification to view DSO's especially open and Globular clusters,

    So IF I were you I'd be looking at buying a 2x Barlow for sure...
    this will allow the 10 mm eyepiece to let you view at both 65x and 130 x...

    AS for what second eyepiece to buy..????
    That is hard to say because at this point you really have no idea of what you like to look at .

    doing some math:
    a 6 mm eyepiece would yield 108x and 216x...
    a 8 mm would yield 81x and 162x
    your existing 10 mm would yield 65x and 130x
    a 25 mm would yield 26x and 51x...

    So PERSONALLY I would grab an 8 mm at this point...thus you would have the ability to observe at 65x,81x,130x or 162x

    I would also plan on Wanting and NEEDING to buy a few more eyepieces in the near future... Your scope is perfect for low magnification wide field views...but can be pushed up to 200x pretty easily for planetary and lunar observations...

    Bob G
    CPC1100 housed in a slotted domed observatory (Exploradome) 4 and 5 inch refractors for use from the lawn, a 8" Sct (NS 8i) for star parties...
    I Hate the winter so I use heated Motorcycle clothing to stay warm while observing in winter
    Retired, also have 2 other hobbies
    1. tinker with older Corvettes (6 in garage)
    2. make a heck of a lot of sawdust in my wood shop.

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    admin (10-31-2009),ebusinesstutor (10-31-2009),Gerrylightning (10-30-2009)

  5. #4
    Gerrylightning's Avatar
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    Default

    Andy, I would listen to Bob on this one it's sound advise for sure.
    Gerry1 10" f5 Newtonian Equatorial mount.
    20x70 Binos.

  6. #5
    Andyvalver's Avatar
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    Default

    Thanks for the advice guys. I might get one of thos2x barlow things. I've seen one on amazon for my scope.

    Andy

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    Default

    Good advice from Bob. A barlow will effectively double the magnifications and eyepiece choices available to you,

    Most of my viewing on the moon and Jupiter is about 120x to 150x magnification, so eyepiece/barlow combos in that magnification range would be good for these.
    Garland Coulson
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    XT8i dob
    Hyperion 8-24mm Click Zoom

  8. #7
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    Default

    Andy.,.,you get what you pay for.,.don't buy the cheapest barlow you can find,,.,the better your EPs the better your view.,.O+O

  9. #8
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    Default

    Good advice from all, just to add a little... if the guess on your scope specs are correct, most specifically the f/5 part, you may want to be cautious with "bargain" EP's. The general concensous from many is the cheaper EP's work very well with slower f/7, f8 and slower scopes, but tend to be a little disappointing with faster scopes as is the f/5. Same with the barlow. So, as stated in a previous post, you get what you pay for. There are great bargains from time to time on excellent EP's, just have to watch for them.
    Criterion (RV-6) 6" reflector, Celestron 10" reflector (dobsonian), Meade 2080 (8" SCT), Orion 120 mm refractor, Orion ST-80 refractor, many binos, Meade 12x50, Barska 15x70, Visioner 20x80, Celestron 25x100

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  11. #9
    Andyvalver's Avatar
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    Default

    How do I know what's a good eye piece and what is not?
    Cheers

  12. #10
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    Default

    I'm about buying a 30-40mm EP for widefield view, because I feel my 20mm doesn't help me too much for star hopping... maybe I have the wrong idea...

    Saludos!
    Celestron Astromaster 130 EQ
    19° 35' 33.75" N / 99° 1' 6.10" W

 

 
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