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  1. #1
    sacstream's Avatar
    sacstream Guest

    Default new eyepiece question

    I have a 8'' dob with 25, 15, 9, and 6mm Plossl eyepieces and a Orion
    Shorty-Plus Barlow. I have been enjoying my scope and have been very
    interested in observing Mars. I have also been using a basic set of color
    filters from Orion. I have not been able to make out any detail except for
    the polar cap though this morning I was able to make out a dark area below
    the cap.( ah progress!). I am wondering if an upgraded eyepiece would help
    and if so what type. I have seen some references here to a 9mm Nagler being
    a good choice for an eyepiece upgrade.Of course it costs just a bit less
    then my scope did! I have found that I get the best bang for the buck using
    my 9mm Plossl with the Barlow in observing Mars. I also like to try to hunt
    down DSOs. I was also wondering what would be the optimal eyepiece for that
    task. Thanks for any advice!

  2. #2
    Al's Avatar
    Al Guest

    Default new eyepiece question

    "sacstream" <> wrote in message
    news:hVSRa.266$ .
    A premium eyepiece may give a marginally better view, but I don't think this
    is the answer...seeing conditions is probably the answer. In spite of all
    the hoopla regarding viewing Mars this year, the planet will still not be
    positioned ideally for best viewing. Unfortunately it's still fairly low in
    the sky (depending on where you are located) and will not get much better.
    On top of this, the Martian atmosphere could be polluted with dust (not sure
    about this as I haven't viewed the planet in 2 weeks). Keep viewing and
    hoping for that crystal clear night.

    Regarding DSO viewing: I find that the eyepieces producing between 80x and
    130x is best for viewing many DSOs. Finding them would be easier with a
    lower power ep.


  3. #3
    Dennis Woos's Avatar
    Dennis Woos Guest

    Default new eyepiece question

    I don't think that replacing your eyepieces with high-end/expensive ones is
    the way to go. I would collimate the heck out of the scope, star test, and
    evaluate the optics. If it is collimated, and the mirror is decent (which
    most commercial mirrors are), you will get excellent views of Mars with the
    eyepieces you have. The most important thing is to collimate. Then, borrow
    a premium eyepiece (e.g. Nagler 3-6 zoom) and enjoy 1) the great view
    through this wonderful $380 eyepiece, and 2) the satisfaction of coming
    pretty close with your <$50 plossl!


    "sacstream" <> wrote in message
    news:hVSRa.266$ .

  4. #4
    John Carruthers's Avatar
    John Carruthers Guest

    Default new eyepiece question

    >Then, borrow a premium eyepiece (e.g. Nagler 3-6 zoom) and enjoy 1)<

    Tell it like it is !!
    I just looked through a Radian and a Chinese generic 25mm Plossl, no
    BUT, under optimum skies I don't doubt there would be a difference.
    Nights like that are few and far between in Britain.

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  5. #5
    Jarad Schiffer's Avatar
    Jarad Schiffer Guest

    Default new eyepiece question

    "sacstream" <> wrote in message news:<hVSRa.266$> ...

    If you are interested in Nebula's at all, I would recommend
    getting a nebula filter - UHC or OIII type. That will make a HUGE
    difference in your views of emission nebulas, especially if you have
    any significant light pollution where you are observing. These cost
    around $125 for the 1.25" versions.
    If you have a 2" focuser, you could consider getting a nice
    low-power eyepiece to give you a wider field of view for large DSO's
    (depending on your f-ratio, a 35 panoptic or 40 Pentax XL might be
    optimal). If you have a 1.25" focuser, you might want to consider
    either a 32mm plossl, or a 24mm panoptic (both give the largest
    possible FOV for a 1.25" focuser).
    For the higher powers, the plossl's you have are probably fine -
    a Nagler will give you a wider field, but that doesn't matter for
    planetary work. It might be nice for higher mag on some objects like
    globular clusters, but will not make a huge difference compared to the
    9mm plossl you have now (assuming the plossl is high quality, e.g.
    Televue, Meade series 4000, Celestron Ultima, etc. If it is a $40 one
    with poor coatings, then it may be worthwhile to upgrade to something

    Hope this helps,

    Jarad Schiffer

  6. #6
    Dave Cole's Avatar
    Dave Cole Guest

    Default new eyepiece question


    Should you need an Eyepiece Calculator, I have one for download at, select "Downloads", then select t-calc. It will take 4
    input items, Scope diameter, eyepiece FL, AFOV, and Objective fl, and give
    you few items regarding your telescope/eyepiece combination. It's free, as
    are a few other programs there.


    For Nexstar11GPS tips, tricks, and general information visit
    For free astronomy software visit, select "Downloads"

    The UNOFFICIAL site for NexstarGPS information.
    All information is "In my opinion" and not to be taken as fact.

    "sacstream" <> wrote in message
    news:hVSRa.266$ .

  7. #7
    Dennis Woos's Avatar
    Dennis Woos Guest

    Default new eyepiece question


    I have a good friend that has some Radians, and another who has Pentax XL
    eyepieces in the same focal lengths. They all are wonderful, and I would
    love to have any of them. I agree that they deliver great views with better
    eye relief and fov, but I think that some people believe that they will
    magically solve all of their optical problems and turn muddy images tack
    sharp. This they will not do, and I think it is important to inform people
    that if the images are poor using decent quality plossls, then expensive
    eyepieces won't provide significant improvements.

    It is always a good idea to go to star parties, and try before you buy.
    Finally, Collimate!


    "Dave Mitsky" <> wrote in message om...



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