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  1. #1
    patrickmathews's Avatar
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    Default Existing eyepiece inventory and use on new XT10



    I recently (last night) purchased an Orion XT10 dob. I also purchased a 2" 35mm Explore Scientific eyepiece with it. I had a 102mm cheapy refractor up until a few years ago (destroyed by accident). I still have several eyepieces that went with that scope and I'm wondering how useful they will be with the new 10" dob. They are all 1.25" and are:

    Meade 4000 DS 9.7mm (came with cheap refractor from years ago)

    Meade 4000 DS super plossl 26mm (came with cheap refractor from years ago)

    Meade GX wide angle 15mm fully multicoated

    Celestron X-Cel 8 mm (this is a much longer eyepiece than the rest for some reason)

    Celestron 2x Barlow

    Garret Optical SWA 20mm F.O.V 72* FMC

    Garret Optical Plossl40mm Fully Multi-Coated

    Orion Sirius Plossl 25mm (came with XT10 still 1.25")

    Lumicon international ultra high contrast filter (again 1.25")

    Are any of these especially useful on a 10" dob? I know they will all fit but I am trying to see if I should trade in some of them and have something different on hand.

  2. #2
    KathyNS's Avatar
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    Default

    Aside from the 40mm, they are all within a suitable focal length range for that scope. The 40mm will still work, but you will get less light than you should because the exit pupil of the eyepiece is too big for the pupil of your eye.

    Whether they work well with that scope is something subjective that you will have to check for yourself. Fast scopes (yours is an f/4.7) do benefit from better-than-budget-quality eyepieces. What usually happens with cheap eyepieces is that the stars at the edge of the FOV deteriorate into smudges or comet-like smears. For a high-magnification eyepiece that you will use for planets, this may be acceptable, since you will only use the centre of the FOV anyway. For a wide-angle EP that you intend to use for large open clusters, it may not be acceptable. It is a judgement call that only you can make.

    Try 'em before buying or selling any.

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    Newtonian Astrograph; ATIK 383L+; EFW2 filter wheel; Astrodon Ha,LRGB filters; KWIQ/QHY5 guide scope; Planetary AP: Celestron C-11; ZWO ASI120MC; Portable: Celestron C-8 on
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    pro; C-90 on wedge; 20x80 binos; Etc: Canon 350D; Various EPs, etc. Obs: 8' Exploradome;
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  3. #3
    patrickmathews's Avatar
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    Default

    Thanks for the response. Given the eyepieces I have, what will be the best setup for viewing Jupiter from my backyard? I tried the x-cell 8mm and it was very difficult to get it focused - it was a bit blurry no matter what I tried. There was too much cloud cover moving in and out for me to try much else last night.

  4. #4
    KathyNS's Avatar
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    You might have had a night of bad seeing. You should be able to use eyepieces down to 5mm on most nights, and even, 2.5mm (or 5mm + barlow) on exceptionally goof nights.

    The 8mm, from your description, sounds like it may be a 16mm with a built-in barlow.

    Anyway, try them all, with and without barlow. See what results you get in different conditions. Then, you'll know if you need to upgrade anything.

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    Newtonian Astrograph; ATIK 383L+; EFW2 filter wheel; Astrodon Ha,LRGB filters; KWIQ/QHY5 guide scope; Planetary AP: Celestron C-11; ZWO ASI120MC; Portable: Celestron C-8 on
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    pro; C-90 on wedge; 20x80 binos; Etc: Canon 350D; Various EPs, etc. Obs: 8' Exploradome;
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  5. #5
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    Default

    I agree with Keith (not unusual) that all of your eyepieces will work...especially on axis... without looking up the FL f the dob al I can say is that I use between 140x and 200x to view Jupiter NO matter which one of my telescopes I am using on any given night...you can do the math.

    Oh and congratulations on the scope...it is kind of a "little bigger" then the refractor however LOL

    Bob G
    CPC1100 housed in a slotted domed observatory (Exploradome) 4 and 5 inch refractors for use from the lawn, a 8" Sct (NS 8i) for star parties...
    I Hate the winter so I use heated Motorcycle clothing to stay warm while observing in winter
    Retired, also have 2 other hobbies
    1. tinker with older Corvettes (6 in garage)
    2. make a heck of a lot of sawdust in my wood shop.

  6. #6
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    Default

    It is GIANT compared to the refractor. Of course, it has been raining/cloudy every night since I bought it but I am crossing my fingers that there will be a let up in the weather tomorrow night so I'll get to give it a real workout.

    I started reading up on eyepieces - specifically the difference between 2" and 1.25". It seems that anything below 26mm would not make a difference so I have no real reason to "trade up" on the eyepieces for the bigger scope. I still may be in the market for a 2" 26mm and may trade in at least the cheapy meades, the Garret 40mm and the orion 26mm.

 

 

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