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Thread: Deep space viewing

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    Default Deep space viewing



    So - more help needed folks
    I have the Orion 130ST reflector + 2 x Barlow and 25,10,6 mm eps.
    Will be adding more 3x Barlow soon.
    Do I have what it takes for some serious deep space viewing - nebula clouds etc or not.
    Im asked in UK north west but near a town so I recognise there will be obscured viewing.

    Any advice welcome.
    SpaceKai!



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    Default Re: Deep space viewing

    Spec sheet says 650mm is your focal length
    260 is your max magnification
    I started with a 130steq.
    Even with 2x the planets were dots. I could separate binary stars and did get a glimpse of Andromeda Galaxy (m31).
    I was hooked from then on!
    So, with 2x your eps are 12, 5 and 3
    54x, 130x, 216x magnification (2x Barlow)
    Can you see anything with that 6 mm ep? Its getting close to max mag.
    How about 3x? 8mm,3mm, 2mm
    8mm=81 mag( that's your 25mm), 3mm =216 mag again (your 10mm) and 2 mm=325 mag (too much)
    My point is a 3x Barlow is too much power. You only have one good eyepiece. Your 25 mm.
    When you recieve it, try it, or not. The company I get my eps from has an "oopsie" exchange policy within 30 days. I can return them undamaged.
    All the best.
    Jeff

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    Default Re: Deep space viewing

    Barlows are overkill with that scope. You will be able to see star clusters, galaxies and nebulas, if you can get to dark skies. A few such objects are bright enough to be visible through light pollution.

    Start with M42, the Orion Nebula. It is a naked eye object, so you should be able to find it even in heavy light pollution. Start with your 25mm eyepiece for the brightest and widest view. Once you are satisfied that you have the scope properly aimed, you can try higher magnification eyepieces.

    M31, the Andromeda Galaxy, is also bright, though not as bright as M42. In dark rural skies, it is a naked eye object. With city lights, it may be a challenge to find it, but it should be visible through your lowest magnification eyepiece. It is very big, bigger than the full Moon. It won't look like much, just a fuzzy blob, but its photons have been travelling for 2.5 million years just to reach your eyes, so it has serious 'cool' factor.

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    Default Re: Deep space viewing

    I'd say go with the 25mm eyepiece but also consider a 0.5x focal reducer, which would be like having a 50mm eyepiece. That will deliver a magnification of 13x and field of view of 4 degrees. That will be great for the Andromeda Galaxy (M31) and Orion Great Nebula (M42). You may also find a light pollution reduction filter helps.

    Boosting the magnification won't help with deep sky objects but will with the Moon.
    Equipmentally challenged.

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    Default Re: Deep space viewing

    An interesting idea but I do not know how well a 10mm exit pupil would work with a newtonian telescope.
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    Default Deep space viewing

    Thanks people. Will investigate further. Wide view seems a good idea. Also will look at focal reducer. Have 2x Barlow but might consider 3x also for the fun of it. Just getting my Xmas list ready 🎉👍🏿.


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    Default Re: Deep space viewing

    It kind of depends on what you consider serious deep space viewing? I would not get a 3x barlow as the 2x is sufficient for visual with that scope. Nor would I do the 0.5x focal reducer with a fast newtonian. Your scope has a focal ratio of f/5 and has a wide enough view already with a manageable exit pupil. The best thing to do is to use what you have for a while to get a feel for the complete package. Once you have some experience with the scope and current eyepieces, then you will be in a much better position to make wiser decisions about what you need to change or keep.

    As for serious deep space viewing, take your time and learn the sky. Study the primary stars and brighter constellations as they are your guideposts to finding all manner of objects. Each aperture has its limitations as to what it can see under the prevailing conditions at the location from which you observe. That is true for your 5 inch newtonian as much as it is for my 17.5 inch newtonian. As we gain experience through experimentation we learn what those limits are. Your scope is quite capable as long as one understands and works within its natural limitations. There simply is no substitute for behind the eyepiece experience, and also dark skies. If you are dealing with significant light pollution, taking the same scope to a darker location will reveal its true capability. Good luck and enjoy the learning.
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