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  1. #1
    Ballbin's Avatar
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    Default A decent Barlow lens for a reflector telescope?



    Hey All - I'm a first time telescope owner and loving every minute of it... My next move is to purchase my first accessory which I have decided to go for a barlow lens. Figured this would be a good next step until I mastered what came with my telescope. I have a reflector telescope and I heard some conflicting advice about what kind of barlow to get... Not so much 2X vs. 3X vs ...nX or how many elements. More about the length or how deep it seats the lens in the scope. I heard that with reflectors you want a longer barlow that seats deep down... but I also heard that you want a "shorty" for a reflector.

    What do you recommend? I am thinking something around the "budget" line maybe slightly higher. I own the Celestron Astromaster 130EQ (and am pretty pleased with it so far). Thanks in advance.

    Chris

  2. #2
    gmazza's Avatar
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    Default Re: A decent Barlow lens for a reflector telescope?

    Currently I use Celestron OMNI with my reflector and refractor, it's a fine barlow for these instruments operating at F6 and F11 and you could unscrew from the tube to have only 50% magnification a fine think in some situations.

    It's budget line as you need, but I'm not sure how it would perform in faster instruments.
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  3. #3
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    Default Re: A decent Barlow lens for a reflector telescope?

    The longer the Barlow the lower the change in field curvature induced by the Barlowing effect.

    This is not to say a shortie Barlow cannot be made to perform just fine, it is just that the prescription is more demanding on both the scope and EPs being used.

  4. #4
    Ballbin's Avatar
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    Default Re: A decent Barlow lens for a reflector telescope?

    I was leaning towards the OMNI barlow but wasn't sure... Knowing that I can unscrew the bottom lens is good to know. Is the bottom also threaded to allow you attach filters to it? Thanks for the info so far.
    Celestron AstroMaster 130EQ
    10mm & 20mm (came with the scope)
    Celestron 2x Barlow

  5. #5
    Don Kittrell's Avatar
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    Default Re: A decent Barlow lens for a reflector telescope?

    My scope is a F4 and I use the Orion shorty 2x barlow. Works fine.
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    Default Re: A decent Barlow lens for a reflector telescope?

    Me too, on the Orion Shorty 2X..... I've had mine for years, and it's a pretty good quality barlow.
    Chris
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    Default Re: A decent Barlow lens for a reflector telescope?

    I got an Orion Shorty 2x not long ago and it works well for my 130mm F/5 reflector.
    Will
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  9. #8
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    Default Re: A decent Barlow lens for a reflector telescope?

    I have owned several barlows all 2x........ really not much difference between brands.
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    Default Re: A decent Barlow lens for a reflector telescope?

    Yea I would say the Omni or Orion Shorty would work fine...you might be able to even find one used on cloudynights.com
    Scopes:Zhumell Z10, Celestron C90, Celestron Nexstar 127slt, Celestron AZ3 mount
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  13. #10
    Ballbin's Avatar
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    Default Re: A decent Barlow lens for a reflector telescope?

    Thanks everyone, looks like a shorty or OMNI depending on which one I get the better deal.
    Celestron AstroMaster 130EQ
    10mm & 20mm (came with the scope)
    Celestron 2x Barlow

 

 

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