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  1. #1
    Ketalar's Avatar
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    Default Considering barlow eyepieces..



    So I got this 130mm aperture newtonian a few weeks ago which came with 25mm and 10mm eyepieces. The store I went to, specialized in astronomy, was really impressive and employees there really looked like they knew the subject and were passionated about it, but I'm scared they might abuse of my ignorance.

    Would 3X barlows be too much - even for 10mm eyepieces - for my scope? I've heard they do an amazing job, but I wonder if it would be actually useful for me to buy them or simply give me an ugly, unwanted result. And if it's too much for my 10mm, would it be worth it to buy them for my 25mm ones or should I simply get smaller eyepieces?

    I'm not sure if this belongs here or into the beginner questions actually, so if I'm in the wrong section correct me

  2. #2
    AbbN's Avatar
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    Default

    I'd wait until you got some mileage on your 2 lenses first - get to know the scope & lenses first then decide. However, if you do go for a Barlow, I'd go with a good 2x. A 3x is probably too much for that size of scope and is certainly too much for either of my scopes

    Lenses tend to be a matter of personal taste.

    Good luck!

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  3. #3
    Ketalar's Avatar
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    Default

    Thanks for the advice Will certainly take that into great consideration.

  4. #4
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    Default

    I do not even own a 3x barlow-- it would have also no use with a 10mm eyepiece. Just buy a 15mm eyepiece and you will be all setup. Here is a good low cost 15mm:
    GSO 1.25" SuperView Eyepiece - 15mm

    Don't forget there are other accessories you might need BEFORE you buy an eyepiece-- like a good field manual star chart, a light folding table, an observing chair, and a red flashlight.... etc etc

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  5. #5
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    Default

    My dad and I own a 3x barlow from TeleVue and it does a nice job. It depends on the focal length of your eyepiece. It works well with a 25mm and gives you a result similar to an 8mm eyepiece. With a 10 mm, it gives you the magnification of a 3.5 mm eyepiece. Only on very good nights should you use it with a 15mm or smaller. If you try very high power on a bad night, you will get a bad result. It also depends on the focal length and aperture of your telescope. Check the specifications of your telescope and see what the highest useful magnification is. The bigger the aperture and the longer the focal length, the more magnification you will be able to get. A lot of people start with a 2x barlow, which does a decent job. But remember to get the right eyepieces. A 25mm with a 2x is too much like a 12.5, so don't buy that if you get a 2x. If you have a 3x, it will act like an 8mm eyepiece, so don't buy that. Think about the magnification with and without the barlow to choose your eyepieces wisely. This will save you money. I think that you should use a 2x barlow if you have one, or buy one to start.

    -AstroMinion

    p.s. Thanks for letting me post my first reply.

  6. The Following 2 Users Say Thank You to AstroMinion For This Useful Post:

    Ketalar (05-28-2011),parrishskies (05-23-2011)

 

 

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