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  1. #1
    RKroeppler's Avatar
    RKroeppler Guest

    Default 6" achro or 8" newt for DSO's?



    Here I go again,
    I was debating in another thread between a Konus 8" newt and a Meade SN-8.
    In light of the responses I decided against the SN-8. But here's another
    question: How about a Konus 6" refractor instead of the 8" reflector. Will I
    notice a huge difference in DSO's with the extra 2 inches or is it negligible
    considering the obstructed aperture of the newt? Thanks in advance for the
    help.

    Scott
    Scottsdale, AZ

  2. #2
    Reef1969's Avatar
    Reef1969 Guest

    Default 6" achro or 8" newt for DSO's?

    The difference will be visible. The biggest difference you will see is on
    Globulars.

    Clear Skies
    Richard

  3. #3
    LarryG's Avatar
    LarryG Guest

    Default 6" achro or 8" newt for DSO's?

    On 02 Apr 2004 01:05:35 GMT, RKroeppler <rkroeppler@aol.com> wrote:


    While I haven't had direct experience on this question, I'll share
    some of the thinking others have stated.

    The Reflector will offer more light, but less contrast. Contrast is
    lost due to scattering inherent in metallic films and the effect of
    rough optical figures on reflected wavefronts vs refracted (2:1 error).
    Diffraction and secondary obstruction play somewhat less important
    roles.

    The Refractor *can* offer superior contrast and final image quality.
    And they don't suffer the tube currents Newtonians are susceptible to.

    The human eye requires that an object meet minimum brightness and
    size criteria to be detectible. The same is true for detail in
    extended objects.

    In the end, it may be six of one, half a dozen of the other.
    Refractor / Deep Sky enthusiasts may have a more definitive answer.

    Cheers,
    Larry G.





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  4. #4
    jerry warner's Avatar
    jerry warner Guest

    Default 6" achro or 8" newt for DSO's?

    DSO's would be better in the reflector, if the mirror is any good. You have the
    further advantage of more true colours (stars etc) withthe reflector vs this
    sloppy achromat. Im glad you dumped the sn8, by the way. Whatever you get
    if at allpossibleget a mount wth a drive - having a drive makes viewing 1000%
    better in terms of not having to move the scope constantly to keep an object in
    the eyepiece, you are able to concentrate on a object longer, and the whirrrr of
    drives
    sounds neat in the late night hours (keeps you company). Good luck!
    Jerry



    RKroeppler wrote:



  5. #5
    zgseronik@netway.com's Avatar
    zgseronik@netway.com Guest

    Default 6" achro or 8" newt for DSO's?

    LarryG <no.return.addr@none.com> wrote:



    Unless unusually extreme, the scatter you write about will not
    perceptably impact the view of deep-sky objects.



    I have had experience using 6-inch refractors and 8-inch Newtonians
    and I disagree. The 8-inch Newt will be sufficiently superior that
    the difference will be obvious to even a first-time scope user. It
    will also likely be easier to use and transport.

    Gary

  6. #6
    RKroeppler's Avatar
    RKroeppler Guest

    Default 6" achro or 8" newt for DSO's?

    Thank you Larry, Jerry, and of course Gary Seronik. Excellent advice from
    everyone. Yes, I do want a scope with a drive and I think waiting for the Konus
    8" newt to come in is my best bet. I observe DSO's 99.9% of the time so those
    extra inches of glass will be helpful!

    Scott
    Scottsdale, AZ

  7. #7
    Jon Isaacs's Avatar
    Jon Isaacs Guest

    Default 6" achro or 8" newt for DSO's?

    >How about a Konus 6" refractor instead of the 8" reflector.

    I don't have a 6 inch Achromat, but I did have a 120mm and compared it to my 8
    inch Newt. In that case there was no doubt which would show the DSOs better.

    If you are considering the 6 inch F8 refractor, I suggest making sure you look
    through one first. The false color on bright objects is definitely a factor to
    be aware of.

    jon

  8. #8
    Bill Meyers's Avatar
    Bill Meyers Guest

    Default 6" achro or 8" newt for DSO's?

    Hello, Gary,
    It's good to have you post on a telescope equipment thread, given your
    impressive knowledge and experience with this subject.
    Moreover, I agree a hundred percent with this particular post. To me,
    the difference between 6 and 8 inches of aperture is obvious.
    I would add that if the original poster means by "DSOs" globular
    clusters and galaxies, I think a 10 inch Dob would be considerably better,
    particularly for the globulars. That aperture seems to be a kind of
    threshold point for resolution of many globulars with direct vision. I
    don't know if you agree with this, though. The original poster didn't ask
    about 10 inch Dobs but it naturally comes to my mind owing to his focus on
    visual. observation of deep sky objects.
    Cordially,
    Bill Meyers

    zgseronik@netway.com wrote:



  9. #9
    Scott Kroeppler's Avatar
    Scott Kroeppler Guest

    Default 6" achro or 8" newt for DSO's?

    The reason I didn't mention a 10" dob is that I really want a newt with
    motor drives for using at public & school events. I'm tempted by the price
    but really want the tracking, and the 10" Atlas or Celestron models are a
    little out of my price range! Thanks again for all the great advice.

    Scott Kroeppler
    Scottsdale, AZ
    "jerry warner" <jwarner@igor.net> wrote in message
    news:406D132E.AB0DCE28@igor.net...
    have the
    this
    1000%
    object in
    whirrrr of
    SN-8.
    Will I
    negligible
    the




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  10. #10
    zgseronik@netway.com's Avatar
    zgseronik@netway.com Guest

    Default 6" achro or 8" newt for DSO's?

    Bill Meyers <stars@auriga.uc.edu> wrote:



    Indeed, nothing convinces one of the virtues of aperture more than
    globulars!

    Gary

 

 
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