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Thread: Recommended eyepieces for new scope

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    Thedarkhole's Avatar
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    Default Recommended eyepieces for new scope



    Hi,

    I have just bought a skyliner 200p for my main telescope, I would like abit of advise on eyepieces for it.

    It comes supplied with a 10mm and a 25mm 1.25"
    I have read these are poor quality, for an amateur like me would that matter so much? I do have a 10mm plossl lens is it worth keeping that, I was thinking about returning it (I wont bore you with details why I have it)

    So basically what to keep what to bin what to get and maybe a barlow aswell?

    Is 25mm the biggest lens you can get, I ask this because I would perhaps like to look at the moon and see it as a whole before I begin zooming in. It can accept 2" eyepieces so im abit confused there regarding fov.

    Regards

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    Default Re: Recommended eyepieces for new scope

    Nothing really wrong with your existing Plossl eyepieces but you can get better all depends on how much you want to spend. I use celestron Xcell lx 10mm and 18mm and Astro tech paradigm 5mm these are around 80 pound here then I have a Orion Stratus 8mm which is around double that, and finaly my favorite a 22mm orion lathanum superwide (not sure what that costs) , there are far more expensive eyepieces but just not affordable here in RSA.
    I dont use any 2' eyepieces
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    Default

    Would you recommend a barlow?
    Would more experienced astronomers use them?


    Sent from my iPad using Tapatalk

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    Default Re: Recommended eyepieces for new scope

    Quote Originally Posted by Thedarkhole View Post
    Would you recommend a barlow?
    Would more experienced astronomers use them?


    Sent from my iPad using Tapatalk
    I know a lot of people use Barlows. Myself included. I'm not a very experienced astronomer (I've had my telescope for less than a year) but it is a good, cheap way to essentially double your EP collection. I've heard many people say they'd be happy with one or two eyepieces and a barlow.
    ~David, Astrophysics major/wannabe~

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    Finder(s): 8x50 RACI, Telrad
    Eyepieces: GSO 30 mm and 9 mm Plossl, ES 25mm, Olivon 6mm Planetary, Zhumell 2x barlow

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    Default Re: Recommended eyepieces for new scope

    If I went back to the start I would buy a 32mm e/p first, to open the world of the deep sky objects
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    Default Re: Recommended eyepieces for new scope

    Depends on your budget a bit. For the majority of observations you'll be in the area of 20 to 25mm and around 14mm being the most useful perhaps with a high magnification 8mm ish for planetary.
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    Default Re: Recommended eyepieces for new scope

    I use a 10mm plossl with 2x barlow for planets and I can just about get it to focus when the conditions allow it, which isn't very often. 30-32mm is useful for getting into the DSO's.

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    Default Re: Recommended eyepieces for new scope

    If you are wanting the best performers vs. cost, that's the ES line of 68s and 82s. If you want good performers at an economical cost, that's the X-Cel line of EPs. A 2x Barlow is useful especially if you only have a few EPs, but as your EP collection grows, you will use the Barlow less and less. Forget a 3x or higher Barlow, they aren't nearly as useful as a good 2x Barlow. Your scope will work best with EPs from 6mm-35mm.
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    Default

    At high magnifications, you're just looking at the central part of the image formed by the scope. So a 1.25" barrel is fine.

    As you decrease the magnification (increase the eyepiece focal length) or increase the apparent field of view (size of the circle you see the image in, measured in degrees - larger numbers mean bigger circles), then you see more of the image formed by the scope.
    If you keep doing this, you eventually reach a point where you're seeing all of the image that will fit inside a 1.25" barrel. To see more, the eyepiece design has to use a bigger barrel size, thus the 2" designs. That's why 2" 40mm eyepieces can have a bigger field of view than 1.25" 40mm ones, and why some ultrawide AFOV eyepieces are only available as 2" versions - they need to see more than would fit in a 1.25" barrel.

    That's why most people with scopes that support 2" eyepieces usually prefer them for low power, wide field views - you can fit a lot more in than is possible with a 1.25" eyepiece.

    Some 1.25" optical designs have dual barrels or a 2" lower body, so you can use them in either size focuser without needing an adapter.

    On the Barlow side, they can be useful when starting out, or if you're using basic scaled design eyepieces like plossls.
    The problem with scaled designs is that - well - they're scaled . To make a 10mm version, you just scale a 20mm eyepiece down by 50%. Unfortunately, that scales everything down, including eye relief - so you have to put your eye twice as close. So if you use a 2x Barlow with a 20mm, you start off with twice the eye relief that you'd have with a 10mm.

    On the other hand, many premium eyepiece designs manage to keep the same eye relief across focal lengths, by using non scaled designs (often by incorporating Barlow like elements.) They can also have bigger apparent fields of view than the basic designs. They also tend to be quite a bit bigger physically than the basic designs, and more (often a lot more) expensive.

    So in my case, since I've managed to build up a collection of premium eyepieces over the years, I tend to mostly only use a Barlow for imaging - and rarely for visual - but that's just me.

    Note that there tends to be a lot of personal preference involved in choosing eyepieces, and that just because an eyepiece uses a basic scaled design doesn't mean it's bad - quite a few folk like plossls and orthos for planetary use, if they can live with the short eye relief at high powers.

    If you have the chance, it can be worth going along to a star party and having a look through different types to see for yourself how they perform and how well you get on with them.
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    Default Re: Recommended eyepieces for new scope

    Well put Jerry a barlow 2x with your existing eyepieces will be fine for now I have a 32mm plossl eyepiece quite cheap and that will work for you for wide field view inyour scope but I have glasses so need slighly better eyepieces 30 years ago plossl would be fine
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