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  1. #1
    Franc Koljaka's Avatar
    Franc Koljaka Guest

    Default Which Powermate should I take?



    Hello,

    Ihave decided to buy a Televue Powermate for my LXD55 SN10. Actually I've
    found that the 2.5X and the 5X are being sold for the same price $168. What
    are the differences (except for magnification) and which one is better for
    my scope?

    Thanks a lot,
    Franc



  2. #2
    Izar187's Avatar
    Izar187 Guest

    Default Which Powermate should I take?

    << Actually I've
    found that the 2.5X and the 5X are being sold for the same price $168. What
    are the differences (except for magnification) and which one is better for
    my scope? >>

    The one that does not end up in the empty magnification range, when combined
    with your existing ep's for high magnification viewing.


    john

  3. #3
    Franc Koljaka's Avatar
    Franc Koljaka Guest

    Default Which Powermate should I take?

    Fully agree for observing purposes, but for photography with a webcam?

    Franc



    "Izar187" <izar187@aol.coma> wrote in message
    news:20040909145516.03847.00000341@mb-m10.aol.com...



  4. #4
    Anders Hansson's Avatar
    Anders Hansson Guest

    Default Which Powermate should I take?

    How about the 5x ? I think an effective fl of f/20 sounds like a reasonable
    starting point in this context.

    Anders H.


    "Franc Koljaka" <franckoljaka@yahoo.it> wrote in
    news:chqaub$q8p$02$1@news.t-online.com:



    --
    correct address anhn at telia dot com

  5. #5
    S.O.S's Avatar
    S.O.S Guest

    Default Which Powermate should I take?

    chose the 2.5x. The sn10 being a low focal ratio (f4?) already suffers
    from coma and chromatic aberation, so a more powerful barlow would
    only increase this. Personally, were it me, I would opt for a field corrector
    before any barlow, especially since at f4 with that scope you are not going
    to get great resolution at high magnification anyway. At least with a field
    corrector you will get tighter and sharper images, wide field. If you are
    looking for magnification with decent images, you will have to get a scope
    of at least f/6 or up - on the cheap side a C8 ota or more expensive a
    6" mak.

    Steve







    Franc Koljaka wrote:



 

 

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