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Thread: eyepiece spc help.

  1. #1
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    Default eyepiece spc help.



    Does anyone know what the specs are for this eyepiece? particularly the AFOV? It's a 4 mm, 250 X, 1.25" Barrel. came with a Celestron Powerseeker 127EQ. I have been searching online and can only find Celestron's Omni line.

    4mmeyepiece.jpg
    Fish4evr

    Celestron Powerseeker 127EQ / Eyepieces: 20 mm, 4 mm / Equatorial mount /

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    Default

    It's probably a basic plossl or worse - so AFOV is likely to be in the 40-55° range, and the eye relief will be tiny.
    At 250x it's pushing things for a 127mm scope - you'd need near perfect seeing conditions to get good results.

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    Default Re: eyepiece spc help.

    I notice that the "accessory kit" that you can get for the Powerseeker scopes (see: PowerSeeker Accessory Kit [item # 94306] ) has two Kellner eyepieces (a 15mm and a 9mm), so I would imagine the 4mm is a Kellner as well. The Kellner is an older, 3-element design with a narrow FOV, usually no more than 40 degrees, with small eye-relief.

    All the best,

    Dean

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    Default Re: eyepiece spc help.

    It is a Kellner, too powerful for your scope, and one I would replace with a better quality 6-8mm ep

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    Default

    Quote Originally Posted by fish4evr View Post
    Does anyone know what the specs are for this eyepiece? particularly the AFOV? It's a 4 mm, 250 X, 1.25" Barrel. came with a Celestron Powerseeker 127EQ. I have been searching online and can only find Celestron's Omni line.

    4mmeyepiece.jpg
    Sent an email to Celestron got this reply

    "The eye relief on high power eyepieces is approximately equal to the focal length. The apparent field of view is 40 degrees on the 4mm with most Plossl designs or 35 degrees with Huyghenian two element high power eyepieces."

    Fish4evr


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    Default Re: eyepiece spc help.

    Huyghenian two element high power eyepieces
    Now there is an oxymoron...
    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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    The weakest link in the optical chain is the large nut located directly behind the eyepiece/ camera. - Gabrielle
    Ya gotta keep this Apo/
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    thing in some balance of perspective. Apos are awesome, but long focus Achros aren't that far behind them - Siriusandthepup (CN)

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    Default Re: eyepiece spc help.

    The Field Of View for this eye piece should be the inside of your junk drawer in the kitchen! Seriously though I have no idea why companies include such "accessories" with their telescopes. It will only disappoint.
    JJ
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