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Thread: Celestron Eyepiece and Filter Kit?

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    amirsm's Avatar
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    Default Celestron Eyepiece and Filter Kit?



    I was hoping to buy the Celestron Eyepiece and filter kit along with either a NexStar 130SLT or NexStar 127SLT. It seems like a great quality kit with a wide range of plössl eyepieces, a X2 barlow, and several filters (even though I'll probably only ever use the Moon filter). I have heard many great reviews on it, but some "more advances" astronomers don't seem to be in favour in kits like these. Why is that? It seems to be a great quality kit with several fully coated plössl eyepieces!? Could someone please explain?

    Eyepiece and Filter Kit:
    http://www.canadiantelescopes.com/Sh...l#.Ui-wWhYZfdk

    Also:
    is there a website that can tell me when Planets rise and set in my city at a certain time?

    Thanks!

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    Default

    The eyepiece kits are a fairly cheap way of getting a wide range of eyepieces so you can see which focal lengths you like.

    The filters are mostly marketing filler - most people usually don't end up using anything but the moon one.

    The downside is that they're basic eyepieces - while there's nothing wrong with plossls, once you start looking at premium eyepiece designs, you can get (more expensive, to a LOT more expensive) alternatives that have better eye relief, wider apparent fields of view, and probably a bit better optical performance - for example, a lot of people really like the wide/ultrawide AFOV designs.

    So the argument against the kits is basically, that if you have the budget for premium eyepieces, you're likely to end up using a collection of them - in which case, why bother buying a basic set that you'll end up replacing?

    The argument in favour of the kits is that they're a cheap learning aid - if you're on a tight budget, they're perfectly usable, if not quite as nice as the more expensive ones - and even if you do gradually replace them with premium versions, they help give you a good idea of which focal lengths suit your scope and targets - so you have a better idea of what to buy next.

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    amirsm's Avatar
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    Default Re: Celestron Eyepiece and Filter Kit?

    Is there any specific series or brand in which I can buy good quality, yet inexpensive wide/ultra wide eyepieces?

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    Default

    As with most things, quality tends to be expensive, and cost tends to increase with apparent field of view... For ultrawides, the best are Televue's Nagler (82 degree) and ethos (100 degree) series - they work well in both fast and slow scopes, but are very expensive. There are several other brands that are cheaper, and also give good results. the ES ultrawides seem to be popular in the states. As you move to the cheaper budget end, performance tends to drop off, but can still be good value for money... For example, I have a cheap budget 80 degree 30mm 2" ultrawide from moonfish - cost was around 1/6th of the more expensive versions. While the premium versions are sharp to the edge, this gets a little soft at the edge in a slow scope like an f10 SCT, and the edge gets worse in faster scopes - in a very fast scope, things are heavily distorted quite a way in, but the central part remains sharp... So it's not as good as the premium designs, but still quite usable in a slow scope...

    In the wide (rather than ultrawide) AFOVs, there's more of a choice, and especially in the 2" long focal length eyepieces, a lot of the budget designs do quite well.

    At medium and short focal lengths, things can get expensive again for the higher quality versions - though usually not as expensive as the ultrawides .

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    Default Re: Celestron Eyepiece and Filter Kit?

    I'm a BIG BIG Fan of these Kits...no matter if they are made by Zhumell, Meade, Revelation, or Celestron...especially for beginners and the reason is simple (see the comment that Jerry made above in his post... i.e. Learning aid...!) These kits in my opinion just plain offer you a CHEAP EDUCATION (15 or so bucks for each USEFUL eyepiece, Barlow and moon filter and a Case that is although small is a keeper.

    With the kits you will be able to determine exactly what 2 or 3 magnifications you seem to use most...You will learn all about eye relief the first time you insert a high powered plossl into the scope and discover just how close to the eyepiece you have to get your eyeball.. and when you look at an open cluster that just doe not quite fit into a plossls FOV you discover what wide field and ultra wide field eyepieces bring to the table...

    The eyepieces included in these kits are definitely NOT junk....but as noted they sure as the devil are not high end expensive "glass" either...

    In the long run (a year or two) spending the money now for a kit will save you money... because you will almost certainly replace every one of the eyepieces with other eyepieces that offer you ore eye relief in the higher power eyepieces or a wider FOV in the lower power eyepieces... You simply will LEARN what you personally want in every specific eyepiece in any given focal length.. therefore when you take out your checkbook to buy a new eyepiece you are not guessing if it will work for you..

    In the end I bet that quite a large percentage of the posters on any astro forum will end up spending more money to fill their eyepiece case then they did for their telescope and if they own multiple scopes they actually paid more of one eyepiece then then did for a few of their telescopes..

    Bob G.
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    Default Re: Celestron Eyepiece and Filter Kit?

    Had one of these- and as has been said a great education.
    I have since sold the EPs, but kept the case and the Barlow- which also doubles up as an extension tube.

    Highly recommended for new astronomers.

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    Default Re: Celestron Eyepiece and Filter Kit?

    And, will this kit be adequate for a 60-year old guy like me with a 10" f 4.7 Dob, with consideration to the average eye pupil size? One website has it for $127 which is tempting....and I don't need to wear glasses when using the scope.

    http://www.optcorp.com/celestron-eye...-kit-1-25.html

    One site says to use low-powered EP's for their wider FOV, while another says to use no less than 51x for the size of the scope (aperture / eye pupil size, or 256/5), where the eye pupil size is assumed to be 5mm.

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    Last edited by josta; 07-04-2014 at 12:48 AM.

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    Default Re: Celestron Eyepiece and Filter Kit?

    If your pupil size is 7mm, and your scope is f/4.7 then you can use eyepieces up to 7 x 4.7 = 32.9mm focal length
    If your pupil size is 6mm, and your scope is f/4.7 then you can use eyepieces up to 6 x 4.7 = 28.2mm focal length
    If you want to know the exit pupil of a 25mm eyepiece on an f/4.7 you do this: 25 / 4.7 = 5.3mm (exit pupil)

    The smallest exit pupil that most people still like is 1mm. On your scope that would mean an eyepiece of 1 x 4.7 = 4.7mm focal length.

    A cheap kit is a poor investment. Most people end up using only one or two items in their kit. For instance, the shorter focal length eyepieces in the kit have very little eye relief. I think you'd be better off buying one or two decent eyepieces for the same money.
    Last edited by Ruud; 07-04-2014 at 01:24 AM.
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    Default Re: Celestron Eyepiece and Filter Kit?

    Quote Originally Posted by amirsm View Post
    Is there any specific series or brand in which I can buy good quality, yet inexpensive wide/ultra wide eyepieces?
    Yes. Explore Scientific EPs are almost as good as the best (TeleVue Naglers and up) but at half the price.

    I'm not a fan of the EP kits. If you stay in astronomy, you will never keep using those EPs, you will replace the barlow, and the only filter you keep may be the moon filter (if you don't replace it with a polarizing variable filter later). So you.re paying $129 for a moon filter you may not keep in the end.

    For $25 more ($155), you can start your EP collection and get a 24mm Explore Scientific 68 degree Argon purged waterproof eyepiece that's almost as good as a TeleVue 24mm Panoptic that sells for more than twice the price ($529), and which will give you a lifetime of service. (Or that you can sell easily, should you wish too).

    Good EPs are always a good investment. Ordinary EPs never are.

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    Default Re: Celestron Eyepiece and Filter Kit?

    The eyepiece kits will easily be outgrown as you get more into astronomy but i dont think they are a bad deal to get a few eyepieces and the barlow to play with the magnification and filters etc...
    Brett

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