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Thread: Help choosing my next eyepiece (4mm)

  1. #1
    SalehRam's Avatar
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    Post Help choosing my next eyepiece (4mm)



    Hello,

    I'm searching for a good eyepiece that can give me more awesome views through my telescope...
    Currently I have a 25mm, and 14mm and a 2xbarlow, I'm looking to reach the maximum of my telescope (Omni XLT 102) magnification power, which is 240 times

    I am very interested in the ES 82 series, but it is a 4.7mm for $150 USD (UWA)
    Based on my calculations that even if I get a 4mm, it will be above my telescope useful magnification so I am afraid of the bad result..

    On Amazon I found a Celestron Omni 4mm EP for $20 USD... The price gave me the initial impression on the quality of the optics, but I may be wrong!

    I found this Vixen 1.25" SLV Lanthanum Eyepiece - 4mm for about $107 USD - it will give me 212 magnification power..
    And this Olivon 58-Degree Field of View HD 1 1/4-Inch Eyepiece, Black, 4mm for $65 USD...

    My conclusion that I take the ES EP, it is wide and 4.7mm below my telescope magnification which is better than go above it and make the EP useless.. I can see details on DSO and planets as well
    And I can throw $20 to get that Celestron 4mm EP just to see how the view through a 4mm EP will be..
    I can later on get an 8.8mm from ES and use it with my 2xbarlow and get closer to the max of my telescope...


    I have an 14mm EP from ES and I like it a lot, so I'll stick with ES for maybe some more EPs...

    Is this a good idea?
    Telescope(s): Celestron Omni XLT 102mm (4") f/9.8 refractor w/ upgraded GSO focuser and RACI finder + QHY MiniGuideScope
    Mount: Computerized CG-4 | Eyepieces: 25mm, 14mm, 10mm, Omni 2x barlow, GSO 3x barlow
    Cameras: My Google Pixel XL camera, ZWO ASI224MC-S, QHY5L II-Mono | Binoculars: Oberwerk 11x56
    Taking photos from the house's window!

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    Lowjiber's Avatar
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    Default Re: Help choosing my next eyepiece (4mm)

    I would just spend the $20 US to convince myself that 4mm is too much for that scope.

    I have two sets of the ES 82 deg eyepieces (two astronomers in the family). Having said that, I question the quality of your 2x Barlow. Why? If it is a typical cheap barlow, you'll lose some quality putting it in front of a decent eyepiece like the ES series. If so, you might consider either investing in a TeleVue or Baader barlow for those few times you want to stretch the limit of magnification on something like the moon or Jupiter.

    With a focal ratio of f/9.8, either the 11mm or the 8.8mm ES should be your minimum focal length eyepiece. The 11mm with a good barlow would serve you well when it comes to "pushing" the magnification as mentioned above.

    Clear, Dark Skies
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    Default Re: Help choosing my next eyepiece (4mm)

    Buy the Omni and you may as well as throw 20 dollars in the trash...

    Look at a decent 9 or 10mm eyepiece instead.

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    Default Re: Help choosing my next eyepiece (4mm)

    Ok now I don't want to buy the Omni.. I did not like its low price at all, so my only thought of it if I want to try a 4mm without spending much money (like a throw-away thing)...

    As for the other EPs, based on the 2 posts (thanks Lowjiber and Davesellars) and since I already have 8.8mm on my list, maybe that one will be a better option... And instead of spending another $150 on a 4.7mm I can get a good barlow that can give me good performance with the 8.8mm..
    Telescope(s): Celestron Omni XLT 102mm (4") f/9.8 refractor w/ upgraded GSO focuser and RACI finder + QHY MiniGuideScope
    Mount: Computerized CG-4 | Eyepieces: 25mm, 14mm, 10mm, Omni 2x barlow, GSO 3x barlow
    Cameras: My Google Pixel XL camera, ZWO ASI224MC-S, QHY5L II-Mono | Binoculars: Oberwerk 11x56
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    Default Re: Help choosing my next eyepiece (4mm)

    If you 2x barlow the 14mm ES62 you'll get a nice magnification for planetary and lunar observation at 143x The 8.8mm would give you 114x - so a good high power for your long focal length scope for detail on globs and smaller bright DSOs. Jupiter should also show quite nicely.

    There is the Baader Classic Barlow which operates at both 1.3x and 2.25 x which may be worth looking into.
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    Default Re: Help choosing my next eyepiece (4mm)

    Look at a Siebert Ortho.

    Siebert Optics - Eyepieces - 1.25"
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    Default Re: Help choosing my next eyepiece (4mm)

    The lowest you should go with your scope and under good steady skies is 5mm. Anything past that and your are into empty magnification and just degrading the view as much as you are magnifying it.
    Refractors: Antares 105 f/15, Celestron 150 f/8, Stellarvue NHNG 80 f/6.9, TAL 100RS f/10, TS 102 f/11, UR 70 f/10, Vixen SD115s f/7.7
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    Default Re: Help choosing my next eyepiece (4mm)

    There are two versions of XLT102 refractor: F10 and F6. In both cases 4-4.7mm EP will be too much. If your XLT102 is F6 and your are looking for a good quality high power EP I suggest ES 82 deg 6.7mm

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    Default Re: Help choosing my next eyepiece (4mm)

    Well it is an F/10...

    But I am still between 8.8 or 4.7.. as Gabby said above that 5mm should me the lowest I kind of understand why but is isnt 4.7 close enough to 5 to be considered when looking at 5mm?

    I do have a 2x barlow and a 14mm ep so with both I can get a 7mm effect

    So getting a 8.8 still giving me a reason to use the 14mm w barlow and to put the 8.8 in the barlow to get 4.4 without buying the 4 or 4.7mm...

    While using a barlow will degrade my image but I cannot just get every eyepiece out there so for me in the beginning of my days I have to do a trade..

    Now please put in mind that I am just starting to build up my EPs set.. I am in this situation:
    I have 25mm, 14mm and an ordinary (sort of cheap) barlow
    With that I effectively have 25mm, 14mm, 12.5mm, and a 7mm
    Getting 8.8mm seems more logical to me so I can have extra 4.4mm (free)
    But again I have a 12.5mm and 7mm (with barlow) why should I have 8.8mm or 9mm (without barlow)?

    I am maybe exaggerating the thinking of this but getting the eyepiece is costly and I dont want to get a useless one..
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    Default Re: Help choosing my next eyepiece (4mm)

    Using a 5mm your exit pupil is 0.51mm which is about as low as you would want to go on a transparent night and have good views if the skies will support it.
    The 4.7mm drops down to just under 0.48mm and puts you over 50x mag per inch of aperture so unless you are using a premium lens set you are degrading the image.
    Once you get below about an 8mm eyepiece, magnification starts to jump very quickly with just small focal length increments.
    Refractors: Antares 105 f/15, Celestron 150 f/8, Stellarvue NHNG 80 f/6.9, TAL 100RS f/10, TS 102 f/11, UR 70 f/10, Vixen SD115s f/7.7
    Mounts: Celestron SLT w/ pier mod & EQ-3 tripod, Celestron hypertuned CG-5 w/ tracking motor & Argo Navis, Manfrotto 028B w/ Stellarvue M2C, Manfrotto 055PRO w/ 128RC, TAL-1 HD EQ, Vixen SXP w/ HAL-130 SXG & half pier
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    Refractors kick arse precisely because they don't hide behind excuses. That is, they have no obstructions to hide behind. - Jon Isaacs (CN)

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