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  1. #1
    Geoff's Avatar
    Geoff Guest

    Default 2 inch GSO Superview eyepieces




    Could anyone out there give me their impression of these eyepieces?

    I am considering getting the 42mm for use in my 10 inch f5 dob.
    Yes I already have a 27mm panoptic and no I dont want to spend the
    extra for a pentax xl 40mm or a bigger panoptic or nagler.

    Thanks.

  2. #2
    Stephen Paul's Avatar
    Stephen Paul Guest

    Default 2 inch GSO Superview eyepieces

    too much ext pupil


    "Geoff" <nospam@me.com> wrote in message
    news:k2rpd0t1sr8qmdtn6vfn1v0hratd2uv8cj@4ax.com...



  3. #3
    Jon Isaacs's Avatar
    Jon Isaacs Guest

    Default 2 inch GSO Superview eyepieces

    >I am considering getting the 42mm for use in my 10 inch f5 dob.

    With an F5 scope, the exit pupil will be 8.4 mm. Assuming a best case of a 7mm
    pupil, your effective aperture will be down to around 8 inches, OK but not
    ideal.

    I have never used one these eyepieces in an F5 scope or any other scope but it
    is hard for me to imagine that they would have the sort of edge correction and
    handle the coma in a way comparable to the Panoptic.

    Probably be disappointed. Also, according to a forum on Cloudy Nights, these
    things have an apparent FOV of around 60 degrees.

    jon

  4. #4
    Geoff's Avatar
    Geoff Guest

    Default 2 inch GSO Superview eyepieces

    On 26 Jun 2004 11:28:34 GMT, jonisaacs@aol.com (Jon Isaacs) wrote:



    I am well aware of all the the above.
    The 27 pan is the longest FL ep I will use for "serious observation"
    where I know that my eye will catch all of the light that my primary
    collects with a 5.4mm exit pupil.

    My question about this eyepiece is purely about getting a largest
    possible fov for a reasonable price and whether this would make a
    reasonable alternative to something like a pentax xl 40mm for an
    eyepiece I wouldnt use all that much.

 

 

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