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Thread: Eyepiece suggestions for Celestron Evolution 9.25"

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    Default Eyepiece suggestions for Celestron Evolution 9.25"



    Hello,

    After months of research I have decided to buy the Celestron Evolution 9.25"
    Here are the specifications.

    Schmidt-Cassegrain
    Aperture 235 mm
    Focal Length 2350 mm
    Focal Ratio 10
    Focal Length of Eyepiece 1 40 mm
    Focal Length of Eyepiece 2 13 mm
    Magnification of Eyepiece 1 59x
    Magnification of Eyepiece 2 180x
    Finderscope StarPointer
    Star Diagonal 1.25"
    Mount Type Single Fork Arm Altazimuth
    Tripod Heavy-Duty Stainless Steel
    Power Requirements Internal Battery Included
    Highest Useful Magnification 555x
    Lowest Useful Magnification 34x
    Limiting Stellar Magnitude 14.4
    Resolution (Rayleigh) 0.59 arc seconds
    Resolution (Dawes) 0.49 arc secons
    Light Gathering Power (Compared to human eye) 1127x
    Optical Coatings StarBright XLT
    Secondary Mirror Obstruction 3.35 in (85 mm)
    Secondary Mirror Obstruction by Diameter 36%
    Secondary Mirror Obstruction by Area 13%

    I want to buy eyepieces and after some research and some user reviews, I have decided that I can afford TeleVue Ethos eyepieces.
    I want to buy 3 eyepieces at the beginning then more in the future.

    I have done some research based on my telescope specs, I have selected some eyepieces and I need some help with selecting the correct ones.

    I will go to places where light pollution will be none but I will mostly use it in mid light pollution around the suburb areas.

    My star diagonal will be
    Celestron 2-Inch XLT Diagonal Mirror.

    1) I want to use 6mm for planets and the moon. Should I go for 8mm? Would 6mm make it blurry?

    2) I want to use 13mm for globular clusters and some deep sky objects. Should I for 17mm instead?

    3) I want to use 21mm for all deep sky and feint objects including feint star clusters and nebula.
    Should I go for 31mm instead?

    Thanks

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    Default Re: Eyepiece suggestions for Celestron Evolution 9.25"

    Instead of eyepieces sub form I have realized I have submitted it here. I would be glad if a mod can send this thread to eyepiece.

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    Default Re: Eyepiece suggestions for Celestron Evolution 9.25"

    Quote Originally Posted by Tarx View Post
    1) I want to use 6mm for planets and the moon. Should I go for 8mm? Would 6mm make it blurry?

    2) I want to use 13mm for globular clusters and some deep sky objects. Should I for 17mm instead?

    3) I want to use 21mm for all deep sky and feint objects including feint star clusters and nebula. Should I go for 31mm instead?
    These recommendations are based on NOT using the Celestron .63 focal reducer (which I highly recommend). I own a C11 so I'm pretty familiar with what you will experience.

    The focal length of the 9.25 will make the 6mm only useful during the very best of seeing conditions otherwise it will just sit in your EP case. So I would go for a 9 or 10mm for planetary objects.

    13mm for globs is a little much with this focal length. I use an 18mm to start and rarely go up to my 12mm.

    For wide field (as wide a this scope will allow) I would get the 31mm.

    Now my pitch for getting the .63 focal reducer/corrector (FR). GET ONE. They are not very expensive and it makes a world of difference. With this FR in place, then all your original selections will be fine choices.

    Cheers, and clear skies,
    JT
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    Default Re: Eyepiece suggestions for Celestron Evolution 9.25"

    I have a full set of Ethos EP and in my SCTs I rarely go beyond the use of my 13mm (about 150 mag) and that is for planetary views. The 17 and 21 are good for DSOs, but you need to go to even lower power for many targets. I also use a 31 and 41mm EPs as well.

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    Default Re: Eyepiece suggestions for Celestron Evolution 9.25"

    I would go for a Delos or Pentax 10mm, 13mm Ethos. After that personally I would buy the Nagler 31mm and if you feel you need a filler the Ethos 21mm.
    Bruce
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    Default Re: Eyepiece suggestions for Celestron Evolution 9.25"

    Quote Originally Posted by jaetea View Post
    These recommendations are based on NOT using the Celestron .63 focal reducer (which I highly recommend). I own a C11 so I'm pretty familiar with what you will experience.

    The focal length of the 9.25 will make the 6mm only useful during the very best of seeing conditions otherwise it will just sit in your EP case. So I would go for a 9 or 10mm for planetary objects.

    13mm for globs is a little much with this focal length. I use an 18mm to start and rarely go up to my 12mm.

    For wide field (as wide a this scope will allow) I would get the 31mm.

    Now my pitch for getting the .63 focal reducer/corrector (FR). GET ONE. They are not very expensive and it makes a world of difference. With this FR in place, then all your original selections will be fine choices.

    Cheers, and clear skies,
    JT
    Thank you for your reply.

    The .63 focus reducer is 1.25".
    I am going to use 2" star diagonal.
    On Amazon the seller posted this:
    the reducer will compress the light cone to roughly 1.25 inches, therefore; there is little if anything to be gained by using a 2" diagonal.
    Will this happen to me too?

    Thanks
    Last edited by Tarx; 07-09-2016 at 09:21 AM.

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    Default Re: Eyepiece suggestions for Celestron Evolution 9.25"

    the amazon seller apparently has no idea what they're talking about, the .63 reducer does not compress to 1.25, anyway- mine works with either a 2"SCT adapter or 2" SCT threaded diagonal, if your hung up on getting the reducer, i can tell you this, its more a benefit to have one then not to have one
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    Default Re: Eyepiece suggestions for Celestron Evolution 9.25"

    Look at it this way...
    (I also have a reducer for my refractor...)
    Having a reducer is exactly like having two different scopes.
    The second of which is a "faster" system. Capable of brighter views with a wider field...
    I don't know anyone who's ever been disappointed after buying one...
    Good luck with the new glass!
    Jim
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    Default Re: Eyepiece suggestions for Celestron Evolution 9.25"

    I'd recommend going with the 31mm and 21mm, then add the 13mm which would be a good magnification for planets and globs. I used to own a C11 and my 82* 30mm EP and a 100* 20mm EP were just an awesome combo in that scope! Later on you may want something around a 10mm for some extra magnification on planets during good nights.
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    Default Re: Eyepiece suggestions for Celestron Evolution 9.25"

    Thanks for all the replies. I think I will get the focus reducer.

    I have revised my plan.
    To start with I can either go

    10mm(ethos), 13mm(ethos) and 21mm(ethos) then buy nagler 31mm later this month.
    Or
    13mm, 17mm and 21mm

    Cannot decide between 10-13mm
    I want to see planetary details. Closer moon observation. But the atmosphere may not allow me. I am googling similar setups on google and have seen some YouTube videos that people doing some nice observations with 8mm on the moon. I may not that type of weather all the time.

    Can I see planetary details with 10mm on this scope? Like details on Jupiter etc? Trying to determine if 10mm gets blurry in even slight bad weather conditions or not.

    Thanks

 

 
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