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  1. #1
    Linwood Albarado's Avatar
    Linwood Albarado Guest

    Default Orion 100mm f/6 vs ED80



    Hi,

    I have the Orion 100mm f/6 Achromat scope. I've cut 4 inches off the
    rear to allow using binoviewers without a barlow. Works fine too,
    especially at lower powers. I have a question, which may have been
    previously asked but I've not seen. Not having looked through one, can
    anyone compare the Orion 100mm achromat to the Orion ED80? Does the
    better corrected optics of the ED80 win over the extra aperture, at
    medium to higher magnifications? Will a Minus Violet filter help the
    100mm much, especially for daytime photographic use?

    I also have a 5" Mak-Newt, which gives great views, but I find it very
    inconvenient for binoviewer use, and impossible without a barlow, and
    I'm hooked on binoviewers.

    Thanks,

    Linwood

  2. #2
    jonisaacs@aol.com's Avatar
    jonisaacs@aol.com Guest

    Default Orion 100mm f/6 vs ED80

    Hi: I had a Burgess Optical 102F/6 and I replaced the original
    objective with an Orion 100mm F/6 Achromat. At that time I also owned
    an ED-80 and I did several side by side comparisons, mostly on the
    deep sky (both urban polluted and Navajo Reservation Dark) but also on
    the planets. The ED-80 provided cleaner sharper but somewhat dimmer
    views. The difference is about like the difference between a quite
    good 8 inch and an OK 10 inch, one might see a tad bit more with the
    10 inch but not a lot, I never really found anything the 4 inch woudl
    show me that that I couldn't see in the 80mm.

    For daytime photography, the ED-80 is a much better choice. For
    example, if you are photographing a bird against the blue sky the
    100mm F/6 will show serious color fringing while the ED-80 will be
    free from false color. At night, I did occasionally use an WO minus
    violet filter with the Achromat, it made some difference but never
    enough that I felt it worth while. During the day, it messes with the
    color balance.

    It was really the daytime performance that convinced me to purchase
    the ED-80. It belonged to a friend, he loaned it to me and one
    morning I took a look at a palm tree a maybe 150 feet away. There were
    some details that really stood out, the ED-80, handled 120x quite
    nicely with a clarity that just was not there with the 100mmF/6 nor
    with my Pronto, both faded at significantly lower magnifications.

    With the going price for a used ED-80 somewhere around $300, it's
    wonderful scope.

    Jon.



    On Aug 10, 12:44 pm, Linwood Albarado <all...@cox.net> wrote:


  3. #3
    Linwood Albarado's Avatar
    Linwood Albarado Guest

    Default Orion 100mm f/6 vs ED80

    In article
    <081b7e87-9f86-49c8-b693-71003f4bb522@v37g2000prg.googlegroups.com>,
    "jonisaacs@aol.com" <jonisaacs@aol.com> wrote:


    That's exactly the kind of info I am looking for. I try to photograph
    the birdies, too. Many thanks.

    Linwood

  4. #4
    Pierre Vandevenne's Avatar
    Pierre Vandevenne Guest

    Default Orion 100mm f/6 vs ED80

    Rich <none@nowhere.com> wrote in
    news:6YidnRKfFKNSXx3XnZ2dnUVZ_sCdnZ2d@giganews.com :


    Have you ever used a telescope Rich?

  5. #5
    jonisaacs@aol.com's Avatar
    jonisaacs@aol.com Guest

    Default Orion 100mm f/6 vs ED80

    On Aug 10, 5:47 pm, Linwood Albarado <all...@cox.net> wrote:

    Linwood:

    I noticed you own a 5 inch Mak-Newt, do you own any larger scopes?
    I find a 3 or 4 inch refractor makes an excellent companion for
    something with some muscle... For a casual evening after work, the
    refractor is nice because it is easy to setup and do not need time to
    cool down. And for a week end in the mountains, the refractor's
    widefield, low power views provide a nice change of pace to what a
    larger scope offers. And too, during the day, the refractor is great
    for photographing those little birdies...

    Jon


  6. #6
    Curtis Croulet's Avatar
    Curtis Croulet Guest

    Default Orion 100mm f/6 vs ED80

    >> Have you ever used a telescope Rich?

    Hmm. Well, I can say that *my* SCT came straight from the factory, and
    nobody has ever borrowed it :-)
    --
    Curtis Croulet
    Temecula, California
    "Rich" <none@nowhere.com>


  7. #7
    Martin R. Howell's Avatar
    Martin R. Howell Guest

    Default Orion 100mm f/6 vs ED80

    On Tue, 11 Aug 2009 23:41:06 GMT, "Curtis Croulet"
    <calypte@**NO**SPAM**verizon.net> wrote:



    Hmm. The above response takes my brain here:

    Three ranchers at a convention having dinner and bragging about the
    size of their ranches.

    First rancher: My ranch is so big that it can be raining on one end
    of it and sunny on the other at the same time.

    Second rancher: Well, that is nothing. My ranch is so big that a keg
    of dynamite could explode at the far side of the property and it
    wouldn't be heard at the near side of the property.

    The third ranch remains quiet until he is prompted into a response by
    the other two. He then says: My ranch is so big that if I drive my
    car for a week, I couldn't get from end of my ranch to the other.

    One of the other ranchers replied: I used to have a car like that.


  8. #8
    Linwood Albarado's Avatar
    Linwood Albarado Guest

    Default Orion 100mm f/6 vs ED80

    In article <6YidnRKfFKNSXx3XnZ2dnUVZ_sCdnZ2d@giganews.com>,
    Rich <none@nowhere.com> wrote:


    Hi Rich,


    You probably right, but only if you assume that all I want it for is for
    a little more serious sky viewing. It's not. A small BV ready refractor
    can also serve, somewhat, as relatively high power binoculars.


    The 6" Mak does sound tempting. But, not yet enough room or money.

    Thanks,

    Linwood

  9. #9
    Linwood Albarado's Avatar
    Linwood Albarado Guest

    Default Orion 100mm f/6 vs ED80

    In article
    <4957059c-c706-404b-9cc3-38bc24694953@m7g2000prd.googlegroups.com>,
    "jonisaacs@aol.com" <jonisaacs@aol.com> wrote:


    Jon,

    Sorry for the delay. For a long time, I've been lazy in my night
    viewing and my backyard location is not so great. I've been more of an
    armchair astronomer (over 40 years now) but like to go out and look,
    just to remind myself it's all for real.

    Besides the Orion 100 f/6, I also have an 8" SCT ota which I don't use
    much, and a C5 SCT ota which is sharp, but when comparing to the
    Mak-Newt, image-wise, it falls down some. However, the flexibility of
    the focusing range of my 5" SCT is tremendous - by combining two 2"
    diagonals and an angled Olympus microscope head converted into a
    binoviewer (I also own a really nice Burgess Model 24), I can see blades
    of grass and some insects in my yard - sort of a long distance low-power
    stereo microscope. Some microscope heads give relatively dim views - the
    Olympus is pretty bright. I wish the Mak-Newt was as flexible as the
    SCT. I also own several mounts.

    You're right though, a small refractor is very useful: as several
    instruments in one, the equivalent (almost) of a 23+ power binocular
    (since I cut 4" off the tube, so no Barlow is necessary), a BV-ready
    refractor, and a good 600mm photographic lens (that is, I guess, if I
    get the ED lens) - to go along with my 100-400 Canon lens. The Orion
    100ED is tempting but 900mm may be a little long to be chasing birds
    with, and carrying.

    When you photograph birds, or other such things, if you do, what
    mounting and what type focuser do you use? Scopes are not nearly as
    quick as AF lenses. And handheld is out.

    Linwood

  10. #10
    jonisaacs@aol.com's Avatar
    jonisaacs@aol.com Guest

    Default Orion 100mm f/6 vs ED80

    On Aug 12, 3:47 pm, Linwood Albarado <all...@cox.net> wrote:


    Linwood:

    I have taken quite a few photos of birds, Many amazingly poor, many
    quite good and some that are quite wonderful. I am a 'digiscoper", I
    use a small refractor, these days mostly a AT-102ED or an 80mm Megrez
    II FD mounted on an appropriate tripod. For the 80mm it's a Bogen
    3040 with a 3046 head. I use 32 mm plossl, focus the image with my
    distance glasses and handhold a Coolpix 4500 up to eyepiece.

    If you have astromart access, you can see some photos under the
    Birding Optics and Photos... Just do a search on my name in the
    group... I should have a website...

    Jon


 

 

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