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    nammyboi's Avatar
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    Default wondering celestron 130 eq



    I was wondering, what is the strongest magnification can the celestron 130 AM get? What is the lowest eyepiece can I get it?

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    Default

    Hi Nammy,

    Generally, you can figure maximum magnification to be about 2x what your objective is, so in this case it is 130 x 2 = 260x

    To get to that 260x (which may be too much power, except in near perfect, very dark skies) you would need to calculate the power of a given EP.

    To do that, you take the EP in mm, and divide that by the scopes Focal Length. In this case, the Celestron 130 reflector scope has a 650mm focal length. Using a 2x Barlow lens and a 5mm EP will get you there, right at 260x. (650mm divided by 5mm = 130, add the 2x barlow and you get the 260x)

    For most objects though, staying with a lower power EP, and then working up as you go. Be sure to allow adequate time for the scope to acclimate (cool down) before trying the higher powers. In some cases this can take over 30 min. of cool-down time for the mirror to achieve it's best performance.

    Hope that is of some help, and BTW, to the site! Be sure to stop by the Introduction Forum and tell us a bit about yourself and your scope!

    Mike

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  4. #3
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    Default

    Hi nammy,

    Welcome to Astronomy Fourm.

  5. #4
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    Default

    Highest usualable EP 5mm but preferably stay around a 10mm
    Lowest 30-40mm which will give you a wide field of view

    A good EP collection should be about 3 good EP's and a 2x barlow

    a 10, 20, 30mm EP wih a barlow will give you

    5, 10, 15, 20, 30 mm EP's

    with magnifications with your scope of 130, 65, 43, 32, 22

    remember that the quality of the EP, field of view and eye relief etc are also important

    IMO

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    Howdy and Welcome Nammy ... glad you dropped in and we all hope you enjoy the site ...

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    Bill - "Recreational 'Stronomer" and "Astro-Junk User" ... EGO lego , proinde EGO operor ...

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    Default

    thanks trevor, I am planning on buying EP's actually, however, what im interested in is viewing nebulas, galaxies, and other planets; I live in louisiana and the light pollution where I live has really bad light pollution. I am able to view the moon fine but I really want to see others. So, the highest magnification I can get is from a 5mm eyepiece? So, a 2mm eyepiece wont work? I currently have a 10mm and a 20mm eyepiece. I also have a question about filters. What are they used for exactly? I don't know much about it thanks in advance =D
    Nam

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    Default

    Higher magnifications will result in fainter images. You do not want them for most deep sky objects (DSOs). You want wide field eyepieces that gather a lot of light. And probably a light pollution filter. If possible, trips to areas with darker skies is much recommended, you'll be doing your eyes (and scope) a treat. For some DSOs, high powered eyepieces might be needed (some of the smaller planetary nebuale for instance).

    Higher magnifications are limited not only by the telescope's aperture, but more importantly, by the seeing conditions. Average seeing conditions (wind/moisture in the air etc), combined with pollution, and then light pollution, will really limit how much magnification you can obtain. Then there's physics/optical limits - things like Dawes limit, diffraction, airy disks, etc.

    You've been given very good advice by the others and I'll echo it. The 130EQ is a f5 unit, so it's focal length is worked out by - aperture X f ratio - i.e. 130mm x 5, ie a 650mm focal length. Magnification is worked out by the focal length of scope divided by the focal length of the eyepiece, in your case with your scope and a 5mm eyepiece:

    650/5 = 130x.

    About right. Couple that to a 2x barlow unit, giving effectively 260x and you're at the upper limit of what the equipment is optically capable of. And this is on a night with perfect seeing. Expect it to be not as good on average nights. Even worse with pollution, light pollution, etc.

    For galaxies etc, I'd really recommend a 20 or 30mm. Go for high quality, multi coated eyepieces (which the Celestron ones should be anyways). They'll cut glare and reflections etc down, increasing contrast and making it easier to see fainter objects.

    A nice tip - the human eye does not see faint objects well. Due to the design of our eyes, we actually see fainter objects better at the edges of our vision, than centrally. This is known as averted vision. It's a technique that takes some time getting used to, but given practice, it'll help.

    Filters - they're used for a variety of things, depending on the type of filter. You'll probably want at least a light pollution filter (1.25" - threads into the base of the eyepiece), and possibly a Hydrogen Beta filter as well. Again, dark skies are a real must.

    Bear in mind that smaller scopes gather less light, which makes it more difficult to see fainter objects with. You should have a lot of success still, with that scope, it's a good'un. Lots of galaxies and nebulae await you I suspect.

    Hope this all helps a bit.

    Dave

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    Default

    same scope i have.... very solid overall beginners package for the money.

    so far i've only been using the included eyepieces....

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    ... glad you went with that 130 SIL ... I've been wrestling with my 114 lately ... lol ...

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    Quote Originally Posted by FatherGuse View Post
    ... glad you went with that 130 SIL ... I've been wrestling with my 114 lately ... lol ...

    haha, i'm sure our scopes share the same eq2 mount?

 

 
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