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  1. #1
    raresfilep's Avatar
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    Default Eyepiece for planetary observing



    Hello everybody,

    I'm new to this forum, and relatively new to astronomy(with a telescope); I own an Orion XT8 which came with the 25mm eyepiece and I want to buy an eyepiece especially for planetary observing. I have a 200$ budget to spend on this future eyepiece. A read a lot of articles on this matter, but I don't know how well some of the eyepieces perform on an 8" refracter with f/6 ratio. For example: Meade 6.7mm 5000series...Please help

  2. #2
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    Default

    As your reflector is an 8" f6, the 25mm eyepiece would only give 48x, which is fine for wide field views of DSOs, but not enough to reveal much detail when observing the planets. For 8" of aperture the ideal magnification range for moon and planets, (from my own experience), would be for most practical purposes from around 120x to 240x. The Meade 6.7mm ocular would yield 180x which gives a planetary image of useful size.
    Personally I like the GSO Super view eyepieces because of their very good performance at an affordable price. With the budget you have, I would suggest the following three oculars: GSO 1.25" 15mm Superview (70deg FOV) (gives 80x), GSO 1.25" 2x barlow (gives 160x when used with the 15mm eyepiece) , GSO 1.25" ED 3x (gives 240x). Also the barlows can be used with the 25mm Plossl you already have, to give you a number of intermediate magnifications.

    Stephen.(44deg.S.) Scopes 14" and 22" Dobs.

  3. #3
    raresfilep's Avatar
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    Default

    Thanks a lot! I forgot to mention, I wear eyeglases consequently a comfortable eye relief is important for me!

  4. #4
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    Default

    I have an 8" Lightbridge and I have used both the 4.7mm and the 6.7mm Meade 5000 Series UWA to gaze at planets. These eye pieces have an adjustable ocular piece which you can adjust for your viewing pleasure. Saturn and Jupiter look crisp while Mars and Venus never really reveal much detail. The moon looks awesome with these eye pieces. Very crisp and lots of detail.
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    Eye Pieces: Meade 30mm Series 5000 UWA 2", Meade 26mm QX Wide Angle 2", Meade 20mm QX Wide Angle, Meade 15mm QX Wide Angle, Meade 15mm Plossl, Meade 6.7mm UWA, Meade 4.7mm UWA, Meade 2x
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  5. #5
    raresfilep's Avatar
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    Thank you Brian! I'm curious, what do I need, beside a steady atmosphere, to see some detail on Mars with my telescope? What magnification?

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    It's my understanding that 8mm-10mm would be fine. People say to get an EP with a large FOV so you don't have to keep nudging your telescope to keep the planet in your EP. I've also read that having a large FOV can sometimes lead to the image, of what you're looking at, to become slightly less crisp than something like a University Optics orthioscopic. The issues with this is that there is hardly any eye relief and the FOV is 45 degrees I think... but the view is awesome.
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    I have an XT8 and I have found that a 9mm gives me the best planetary views. I can't give you a brand but I do that you don't need a wide FOV as you are not really looking at the edges of the EP. You might look at the Orion Edge-On Planetaries.
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    Quote Originally Posted by neal_mlc View Post
    I have an XT8 and I have found that a 9mm gives me the best planetary views. I can't give you a brand but I do that you don't need a wide FOV as you are not really looking at the edges of the EP. You might look at the Orion Edge-On Planetaries.
    Would you suggest getting the expansion set? The focal lengths offered seem to cover a decent spread, and the cost of the set is only 79 dollars over the 200 dollar limit he initially said at the beginning of the thread. Plus, he already has the 25 mm for DSOs which would work for the time being.
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  9. #9
    raresfilep's Avatar
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    Knowing that, due to Earths motion, objects leave quickly the field of view with higher magnification, would'nt it be better to have a larger FOV?

 

 

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