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Thread: First Barlow lens

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    Default First Barlow lens



    Hi everybody!

    I'm new to this forum and new to astronomy as well! I just bought a Sky-watcher dobsonian 6" and it came with a 10mm and a 25mm eyepieces. I am thinking about adding a barlow lens to my set and my astronomy store is selling a Antares barlow 2xTL. Is it any good? Should I be looking for something else instead? I can't afford the Televue or anything in that price range. I'm looking for decent quality-value.

    Thank you very much for your opinions!

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    Default Re: First Barlow lens

    I have the 1.5x version of this, I'm considering getting others.

    IMG_20171108_113702.jpg

    The optical quality is very good even though it's an achromat. I have a lot of Barlows including TeleVue ones and this holds its own against any of them. The twistlock mechanism works well and it is quite a weighty Barlow physically due to the quality brass drawtube. However, the filter threads are oversized and won't hold any 1,25" filter threads at all. This seems to be a common problem on certain Antares products. If you don't mind threading your filters directly into the eyepiece when using this Barlow it should be fine.
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    Default Re: First Barlow lens

    Welcome to the forum!!

    The Barlow should be decent, but you may want to reconsider getting a Barlow. Most of us have at least one, but most of us RARELY use a Barlow. The majority of us only use it for the rare occasion of excellent seeing when we can push the magnification higher than normal and do not want to spend the money on a rarely used dedicated EP.

    With the Barlow, your 25mm would become 12.5mm which is fairly close to your 10mm and the 10mm would become 5mm which is too much power for your scope (the shortest regular use EP for your scope would be 8mm). So you wouldn't get much more than you already have with the Barlow.

    I would increase my EP collection to some more useful pieces in addition to replacing the stock EPs with some better quality ones. I would probably be looking for something between the 25mm and 10mm in the 15-18mm range to begin with, that EP would Barlow well for your highest regularly useful EP if you were still considering a Barlow. I also would get an EP to give me the widest possible view. Once your EP collection is filled out, you likely will not use the Barlow anymore with a very rare exception.

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