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  1. #1
    Kurt52's Avatar
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    Default Eyepieces for CPC 800



    Hey Folks.

    Just purchased a new Celstron 800 and I am wondering what are the best type of eyepieces to get for a newby.

    Thanks, Kurt

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    Lola Bruce's Avatar
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    Default Re: Eyepieces for CPC 800

    Their isn't a best type that is quanitive. What kind of budget and objects so we may help you? As a starting point 10mm and up 1.25 barrel eyepieces, you will have to upgrade the diagonal to a two inch for two inch eyepieces. You have a great scope and it is capable of extracting the performance of good to premium eyepieces. Kits generally are not very good.
    Bruce
    CPC 800XLT, Takahashi 102 TSA, Takahashi Mewlon 250s,
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    Default Re: Eyepieces for CPC 800

    I also have a cpc800 my advise would be dont rush out to buy any new eyepieces just yet because you will just probally end up upgrading them again in a few monthes time, i did, so my advice would be to spend the coming weeks using the stock 10mm and 25mm and keep researching the different eyepiece types and sizes either by books, online articles, customer reviews and forums like this one and only then decide to maybe upgrade the star diagonal to 2 inch and then you can unleash the full potential of your scope.
    Most newbies make the mistake of thinking that the higher the magnification the better the view and whilst in some circumstances this maybe true most of the time it is the opposite. Also remember that what works well for one type of scope may not work so well in yours.
    Have fun and learn loads.
    Scope = Celestron CPC800 8"sct. Sky-watcher Heritage 130p flex tube Dobsonian Binoculars = Helios Ultima 10x50 porro prism.
    Eyepieces = Baader Hyperion Aspheric 31mm and 36mm. Baader Hyperion 8mm, 13mm, 17mm, 21mm and 24mm.
    Diagonal = 2" Altair dielectric diagonal.

  4. #4
    Bob327's Avatar
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    Default Re: Eyepieces for CPC 800

    Gosh I swear you have asked this question more then once lately....

    BUT Personally I would recommend something in the 13 to 17 mm range as well as something around 30 ....You do not have to spend big bucks for eyepieces your scope just id not that demanding ...To be honest I;d invest about 150 dollars and buy a eyepiece kit then LEARN what you seem to use the most and they gop looking for replacements SLOWLY...

    In the end I'm willing to bet you will have more money tied up in eyepeices then you have in the scope (this is common lol)

    Bob G
    CPC1100 housed in a slotted domed observatory (Exploradome) 4 and 5 inch refractors for use from the lawn, a 8" Sct (NS 8i) for star parties...
    I Hate the winter so I use heated Motorcycle clothing to stay warm while observing in winter
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    Default Re: Eyepieces for CPC 800

    For the budget minded take a look at Paradigm Dual ED eyepieces or the Agena Starguider eyepiece. For about $60.00 each they are very good eyepieces for a 8" SCT. I have 4 of the Paradigm and 1 Starguider and they are identical eyepieces. The have a 60° FOV and are sharp in my SCTs. Both versions perform just great in my Meade LS8 and C9.25 scopes. You can find them on the used for sale sites at very good prices also.
    Johnny
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  6. #6
    pvaudo's Avatar
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    Default Re: Eyepieces for CPC 800

    I'm also curious.. about 1.25" vs 2" EPs with a CPC 800.

    I am considering CPC 800 and 925. My understanding is the 800 cannot take full advantage of 2" EPs due to it's narrower central tube, but the 925 can.

    Any comments appreciated, Thanks!

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    pvaudo's Avatar
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    Default Re: Eyepieces for CPC 800

    Found my answer on 2" EPs with the CPC800, the answer is: most will work fine.
    Below 35mm you will see vignetting, but 35 is already pretty wide so probably not an issue unless you get a wider, lower power EP.

  8. #8
    Kurt52's Avatar
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    Default Re: Eyepieces for CPC 800

    I bought an eyepiece kit for my CPC 800. What will 2" eyepieces do for me?

    Kurt (new guy)

  9. #9
    pvaudo's Avatar
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    Default Re: Eyepieces for CPC 800

    Kurt, I don't have my CPC800 yet (arrives tomorrow!) but have been looking into that same question.
    Here's my current understanding:

    1) Wide field-of-view eyepieces can give you a bigger, wider, more comfortable viewing experience.
    2) Wide FOV EPs are available in both 1.25" or 2" sizes. But..
    3) LOW magnification EPs may need the larger 2" optical path.
    4) HIGH magnification EPs only require the smaller 1.25" optical path.

    Optically I think it works like this:
    Imagine the back of the scope with the eyepiece and mirror removed. There is a hole.
    The scope itself, with nothing attached, delivers an image approximately the size of that hole.
    A low magnification EP will take most of that image and deliver it to your eye, so a wider optical path is good.
    A high magnification EP will take just the small center of that image.. so a smaller optical path is no problem.

    I think it has to do with where the focal points of the EP and the Scope overlap. I picture two imaginary cones (focal points) pointing into each other. The size of the resulting circle (where they overlap) relates to magnification. A low-mag eyepiece means the cones are farther apart and the overlap circle is smaller, so a 1.25" path is fine.

    In summary you can buy wide FOV eyepieces in either 1.25" or 2" size, but only a low magnification EP (high mm) can take advantage of a 2" optical path.
    If you are using a wide path, you might as well be using wide FOV 2" EPs to get that nice view.

    Another poster said his 35mm EP is about the highest mm you can use with a 2" path before you start to see vignetting, or dark edges. Remember that 'mm' factors into magnification, not the field of view. It's the eyepiece that determines the FOV delivered to your eye. More FOV = more $.

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    Bob327's Avatar
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    Default Re: Eyepieces for CPC 800

    Kurt:
    You DID NOT waste your money with the kit as you will get an education allowing you to figure out what eyepieces you seem to use more then others etc...The kits eyepieces although far from top of the line are definitely not junk although the higher power ones have extremely short eye relief so in a few moths you can start replacing them one at a time with better ones (and these do not need to be high end eyepieces.

    2 Inch eyepieces just allow you to get a little wider FOV which is useful especially under low power...AS such ALL of my 27 mm and Lower Power Eyepieces are 2 inch ones...and EVERYONE of my 25 and higher power eyepieces are 1.25 inch ones...

    Be aware however that the C8 can not take full advantage of the full 2 inch barrel of the eyepiece since the internal baffle inside the OTA measures only 1.5 inches ..BUT it is still worth the money to convert over to them ...Te view in my C11 which can utilize the full 2 inch diameter is only slightly wider then the view in my C8 . MY 35 mm does vinegate a hair in my C8 but it does not bother me at all..

    Bob G
    Bob G
    CPC1100 housed in a slotted domed observatory (Exploradome) 4 and 5 inch refractors for use from the lawn, a 8" Sct (NS 8i) for star parties...
    I Hate the winter so I use heated Motorcycle clothing to stay warm while observing in winter
    Retired, also have 2 other hobbies
    1. tinker with older Corvettes (6 in garage)
    2. make a heck of a lot of sawdust in my wood shop.

 

 
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