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  1. #1
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    Default Eyepiece quality for high power



    I have a Celestron Omni xlt 150 reflector, i have a standard Meade eyepiece filter set. At high power planet viewing images are ok. Would i have better views with a high quality eyepice and barlow or would there be not much difference worth spending the extra money for? Thanks Tom

  2. #2
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    Default

    Every scope has a maximum magnification (which is usually significantly lower than what the manufacturer quotes you) beyond which the image quality deteriorates. If the reason that your high magnification views are merely "OK" is because you are already at that maximum, then getting more expensive eyepieces will be a waste of money.

    You can easily calculate the maximum practical magnification. It is equal to your aperture in millimetres. So, the maximum magnification of your 150 mm scope will be 150x. The eyepiece that will give you that maximum is equal to your focal ratio. In excellent conditions, you will usually be able to go to double that magnification, but not in average conditions.

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  4. #3
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    Default

    Really a hard question to answer as the 150 Xlt is really designed as a nice LOW POWERED Wide Field telescope ...

    At f/5 it is a fast scope and will require better then average eyepieces...to preform very well BUT I do not think the scope would really show "ME" a much better image in the eyepiece..

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  5. #4
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    Default

    Quote Originally Posted by KeithBC View Post
    . It is equal to your aperture in millimetres. So, the maximum magnification of your 150 mm scope will be 150x. The eyepiece that will give you that maximum is equal to your focal ratio.
    Neat trick with the focal ratio - when you do the sums it's obvious, but it hadn't occurred to me before :-). Don't think I've seen it mentioned before - but a great shortcut.

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    Default

    Quote Originally Posted by tomcat View Post
    I have a Celestron Omni xlt 150 reflector, i have a standard Meade eyepiece filter set. At high power planet viewing images are ok. Would i have better views with a high quality eyepice and barlow or would there be not much difference worth spending the extra money for? Thanks Tom
    Can you provide more detail? What ep are you using? What do you consider "high power?"

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    Default

    Quote Originally Posted by tomcat View Post
    Would i have better views with a high quality eyepice and barlow or would there be not much difference worth spending the extra money for?
    High quality EPs only perform their best when the main objective is also of similarly high quality.

    I had a set of Zeiss Orthos pass through my posession most of a decade ago. In my 6" Astro Physics Refractor, I could tell the difference between these Othors and some random Orthos a friend had. In my C11 I could not tell the difference between either set of orthos.

  8. #7
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    Default

    I have the Celestron eyepiece filter kit. Eyepiece says multi-coated. High power i'm using would be 2X barlow with either the 6,8,13mm eyepieces. Thanks Tom

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    Default

    Quote Originally Posted by tomcat View Post
    I have the Celestron eyepiece filter kit. Eyepiece says multi-coated. High power i'm using would be 2X barlow with either the 6,8,13mm eyepieces. Thanks Tom
    Using the barlow with the 13 mm makes sense to get better eye relief than the 6 mm, but they are similar magnification. Using the barlow with the 8 mm is at the top of your scope capability. It is also greater than most skies will permit.

    Better eps will give you flatter fields. That means less coma around the edges. You may also get wider fields of view.

  10. #9
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    Default

    Thanks for feedback. Tom

 

 

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