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  1. #1
    Cerdic's Avatar
    Cerdic Guest

    Default Orion ED80 or Orion 120mm scope?



    I am hoping to get a refractor for astrophotography at some point in the
    future.

    Orion has their ED80 which is supposed to be great and is around $500. Of
    interest is also their 120mm (600mm focal,f/5.0) refractor for less than
    $300. They claim that it's a good scope for astrophotography.

    Now, the 120mm sounds so much better for the much larger aperature, and I
    could also use it as a general viewing scope. Does anyone have any opinion
    on these OTAs? Is the ED80 that much better for photography?

  2. #2
    urban astronomer's Avatar
    urban astronomer Guest

    Default Orion ED80 or Orion 120mm scope?

    I only have the ED80 but from what I understand, the superior color
    correction of the ED80 should result in sharper, more pinpoint star
    images. The 120 will yield more bloated star images because of the
    chromatic aberration. The exposure time might be a little shorter due
    to the larger aperture, but I don't think it would be worth the
    minuses. But don't take my word for it, there should be plenty of
    images on the web showing images taken with either scope, so you can
    see for yourself.

    An extra consideration on the side is that the ED80 will do an
    admirable job on the planets, visually and I presume photographically.
    The 120 won't be able to rival it at all.


  3. #3
    George's Avatar
    George Guest

    Default Orion ED80 or Orion 120mm scope?


    "Cerdic" <blah@blah.org> wrote in message
    news:Xns974397D5739BBnospamnooospamcom@63.218.45.2 54...

    f5 ratios are great for widefield and light buckets, but at an f5 ratio,
    you will likely have problems with coma (someone correct me if I'm wrong)
    if you use it for astrophotography. I personally was buying a refractor,
    I'd get an APO with at least an f7 focal ratio. The 80mm ED is an
    adveertized as an apochromatic scope with an ratio of f7.5. It also has a
    crayford focuser, which is highly desirable. So if these two were my only
    choices for the price (which, of course, they are not), I'd get the 80 mm
    ED. But that's just me.

    Having said that, Vixen makes an ED80SF - 80mm f/7.5 APO Refractor OTA that
    comes with a finder scope, flip-mirror diagonal along with other
    accessories, and a hard case for $625.00. And for a little more dough
    (about $800), Williams Optics makes a Megrez 80 II ED - 3.14" f/7 Triplet
    Refractor that is said to have superior optics for the price.

    George



  4. #4
    Brian Tung's Avatar
    Brian Tung Guest

    Default Orion ED80 or Orion 120mm scope?

    George wrote:

    "Have problems with coma" pretty much contradicts "great for widefield."
    Apochromats are exquisite little creatures not just because they correct
    for chromatic aberration, but because they are typically well-corrected
    for coma and astigmatism, too. It is a common error to think that the
    principal benefit of apochromats (despite the name) is color reduction.

    Also, the larger the objective, the more of a problem coma is for a
    given design and focal ratio. So focal ratio alone will not define the
    problem well enough.

    --
    Brian Tung <brian@isi.edu>
    The Astronomy Corner at http://astro.isi.edu/
    Unofficial C5+ Home Page at http://astro.isi.edu/c5plus/
    The PleiadAtlas Home Page at http://astro.isi.edu/pleiadatlas/
    My Own Personal FAQ (SAA) at http://astro.isi.edu/reference/faq.html

  5. #5
    MikeA's Avatar
    MikeA Guest

    Default Orion ED80 or Orion 120mm scope?


    "Brian Tung" <brian@isi.edu> wrote in message
    news:dpmsvu$ufk$1@praesepe.isi.edu...

    Ok, so what does?



  6. #6
    David Nakamoto's Avatar
    David Nakamoto Guest

    Default Orion ED80 or Orion 120mm scope?

    I own a very similar refractor from Orion, and have tried to use it for
    astroimaging. I got bloating around bright stars, the brighter the star the
    more bloat. I thought the results had some aesthetic appeal, but it's something
    you'd better be aware of. It can be minimized by using filters, but this means
    black and white imaging/photography and longer exposure times.

    --- Dave
    --
    ----------------------------------------------------------------------
    Pinprick holes in a colorless sky
    Let inspired figures of light pass by
    The Mighty Light of ten thousand suns
    Challenges infinity, and is soon gone

    david.nakamoto@verizon.net


    "Cerdic" <blah@blah.org> wrote in message
    news:Xns974397D5739BBnospamnooospamcom@63.218.45.2 54...



  7. #7
    Cerdic's Avatar
    Cerdic Guest

    Default Orion ED80 or Orion 120mm scope?

    "urban astronomer" <malcolm.p.g@gmail.com> wrote in
    news:1136583057.556149.4960@g49g2000cwa.googlegrou ps.com:



    One of my concerns was that I wouldn't get enough magnficiation and light
    grasp for the ED80 to give good views of Mars, Jupiter, and Saturn, but
    from what you say, it's not an issue.



  8. #8
    Cerdic's Avatar
    Cerdic Guest

    Default Orion ED80 or Orion 120mm scope?

    "David Nakamoto" <res07oeg@verizon.net> wrote in
    news:HEJvf.5793$ya.4322@trnddc04:


    Does it give you good views of Jupiter, Saturn, and Mars?



  9. #9
    Howard Lester's Avatar
    Howard Lester Guest

    Default Orion ED80 or Orion 120mm scope?


    "Cerdic" wrote


    The issue is more about resolution with a relatively small 80mm objective
    than about light grasp and magnification. I got a "decent" view of Mars with
    a 3mm Radian (200x). It wasn't as good as the view through my 8" reflector,
    but one can't make that into a fair comparison. The ED80 I find to be a fine
    telescope. Some of the others previously cited (e.g., Vixen 80mm with case
    and something else for $625) may be better values.



  10. #10
    Jim Lennie's Avatar
    Jim Lennie Guest

    Default Orion ED80 or Orion 120mm scope?

    I have a 120mm Skywatcher refractor ( F8.3 ) and a Skywatcher ED80 refractor
    and make no mistake the 120 refractor always shows more detail than the ED80
    on the planets and moon. The ED80's views are more pleasing though due to
    the lack of false colour. I haven't tried either yet for photography but the
    ED80 will win here from what I have read. Visually, there is no contest
    between the 120 and 80 refractors, the 120mm always resolves more detail.

    Jim

    "Cerdic" <blah@blah.org> wrote in message
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