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  1. #1
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    Default a 2'' barlow with 1,25'' eyepiece - how does it work?



    Has anyone got any experience with the skywatcher 2'' barlow? Especially, how it works with 1,25'' eyepieces? There's an adapter included. I'd like to use it with my 203 f/5 scope.

    Greetings,

    Eliahu

  2. #2
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    Default

    Hello,
    I'm a newbie here and have small experience with eyepieces/barlows.
    I believe that 2" barlows are designed to be used with 2" eyepieces, and the same for 1.25" barlows with 1.25" eyepieces.
    The 2" to 1.25" adapter is used, if you wish to install 1.25" eyepieces on your standard 2" telescope.
    By using a barlow x2 with, for example, a 30mm e.p., it will change it to a 15mm equivalent.
    Or a 15mm into a 7.5mm e.p.
    Hope I've got it right. Lol

  3. #3
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    Default

    The same way you use a 1.25" eyepiece directly on your 2" focuser, with a 2" to 1.25" adapter. Usually 2" barlows and powermates include the adapter, if not you can use the one of your focuser or buy one separately.

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    Default

    My 2" zhumell works great but only with the included recessed adapter.
    Other adapters place the eyepiece too far from the barlow lens and don't allow enough backfocus on my ed80.
    Just for kicks I used my 1.25" barlow in my 2" barlow with several ep's and got acceptable high power views.

  5. #5
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    Default

    Thank you all for your responses, let's experiment then!

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    Default

    there you go eliahu,
    question asked,question answered.nice place to be.
    you'll find the adapter an easy piece to purchase,and relatively cheap aswell.
    if you struggle with finding dealers,try ebay.loads of them on there.
    good luck,
    clear skies,
    andy

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    Default

    My 2" Zhumell 2x Barlow came with an adapter to allow 1.25" eye piece to be used with it too.

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  10. #8
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    Default the first nite barlow 2" + 1,25 eyepieces

    Following your advice, guys, I decided to buy a 2" barlow. I just finished my first practical test. So here's the results - everything worked perfectly alright. I tried both of the eyepieces that came with my f/5 8" skywatcher - the SP 25mm and SP10mm. The 10mm was a real rocknroll! The sky was very good - we had a short rain today, which is pretty unusual at this time of the year in Israel. After sunset all clouds were gone and the Moon gave me an hour to go without it. So the first shot was Venus - a very good view. Then I had Saturn and Mars. Still, I did not manage to spot the Saturn rings. And then there was the Moon. The 10mm with barlow, if I am not mistaken, gives x200 magnification. I put a Moon filter to my SP and really enjoyed the view. The best was to focus on the edge of the Moon and let the Earth do the job - you get this SF movie feeling of passing by the Moon in a spacecraft as the Earth spins. There was some air wobbling seen on the edge of the Moon but generally the views were very rewarding. I must say I had no problems with the 2'' barlow and 1,25" eyepieces stuck in the adapter. Once again, thanks for all your comments.
    Clear skies,

    Eliahu

 

 

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