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  1. #1
    nemesis256's Avatar
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    Default Help me choose eyepieces



    So what I have is a Celestron 6SE (f/10), the 25 mm plossl it came with, a 15 mm Orion Expanse, and a 2x Orion Shorty Barlow. I have a couple problems with this setup.

    First is my Astronomik UHC filter. It fits the 25 mm and Barlow, but not the 15 mm. I will also be getting an Orion variable polarizer for the moon. Obviously, I would like both of these filters to fit any new eyepieces I get.

    The second problem is with the Barlow. I find that it's just a little too much work to put it in, when compared to simply switching eyepieces. Another problem with it is that the area where the image is visible is fairly small. I have to move my head around to find the entire circle projected.

    So the first eyepiece I'm looking for is in the 8 to 9 mm range, as this seems to be approximately the maximum magnification for my scope. I'm looking to spend around $100 for an eyepiece. I wear eyeglasses, so I need good eye relief, and a slightly wider view would be nice. Two models I'm looking at are Orion Epic II ED and Celestron X-Cel LX.

    The second eyepiece I'm interested in, but may entirely forget about, is a wider one. I mostly want this to be able to fit bigger objects like the double cluster and possibly the Pleiades. But I'm not sure if I really want this since big objects like the double cluster don't seem to be that common. Are there any eyepieces that are wide enough to fit the Pleiades?

    Another related question. What improves with eyepieces as price goes up? Why should I think about spending more than $100?
    Last edited by nemesis256; 12-21-2011 at 01:07 AM.
    Skywatcher 10" Dob | Celestron 6SE | Coronado Solarmax 60

  2. #2
    Pingu's Avatar
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    Default

    Have you looked into Meade's 5000 HD60 EP's? I've read they're pretty nice. You can shop around but here's a link just to show ya what I'm talking about.

    http://www.adorama.com/MDHD609.html?...m_source=gbase
    Cal
    ETX-125
    ES 11mm, 16mm, 20mm, 24mm


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  4. #3
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    Default

    My aging eyes like Zhurmell's "Z" series Planetary lenses. They give a 50 degree view with 20mm of eye relief. Absolutely no difference in looking through a 12.5mm or a 3mm. A little dim for deep space fuzzies, but great for moderate magnitude and higher.

    For wide viewing, I like the 2" 32mm Meade that I have, but I have a short (750mm) focal length.

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    16" ,Celestron Omni 150 XLT(My review here http://tinyurl.com/7me2mb6 ), 2"26mm 2"32mm, 32mm, 25mm, 12.5 mm, 10 mm, 6mm & 4 mm Plossl + 12.5mm, 9 mm, 5mm & 3mm Planetary. 2" & 1.25" 2x Barlows.
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  5. #4
    Bob327's Avatar
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    Default

    Nemisis... While the "listed" maximum magnification is listed as close to 360x we all know that you would have to be on the moon to be able to use that much magnification so you idea of a 8 or 9 mm eyepiece (187x or 166x) right on the money ...

    I tend to view planets between 140x and 200x no matter which scope I am using on any given night...but find myself only using extreme magnification above 300x) on the moon... so a barlow with a 10m mm eyepiece can get you there...

    That said...Visual backyard astronomy is all about gathering light (read aperture) and NOT about magnification ... and I find myself observing with low powered eyepieces between 50x and 100x the majority of the time..again no matter which scope I am using...so to be honest IF I owned your scope I'd be looking for eyepieces in the 30 mm range long before I would be looking for high powered eyepieces...

    As for the filters. when I am being a lunatic (concentrating my viewing session on the moon) I install my moon filter on the diagonal rather then on the eyepiece.. this way the filter is always on and I can rotate eyepieces on and off the scope and it makes no difference if the filter fits all my eyepieces...

    Eyepieces are extremely "personal" items so I gave up recommending specific brands long ago...BUT you scope (at f/10) is not at all demanding on the quality (read cost) of the eyepiece you use...there is no need to spend big bucks to get very satisfactory views...

    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.

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  7. #5
    astronut's Avatar
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    Default

    Id add a 25-32mm ultra wide angle eyepiece like say a 82 degree ES eyepiece for all the large objects like galaxys, star clusters, multiple DSOs in one area, & as a searching eyepiece. Its the one eyepiece you won't get rid of that will stay with you thu any scope.
    I have a pretty good variety but am going to get the ES 25mm for its wide 82 FOV & its just the right mag for what I like looking at. Your a LOT better off with an eyepiece like this then a 8mm-9mm trust me the seeing won't let you use that often, also you can barlow a wide field with wonderful hi power wide fields that still retain long eye relief, another plus.
    Dave
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  9. #6
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    Default

    Bob327 has good advice. You need to use what you have a bit longer, then you won't need our opinion. You will know what you like to look at and what ep is needed.

    The question you asked about price drivers for eps hasn't been addressed yet. The most common low cost design is a plossl. They are inexpensive to make and are made in large numbers. But the eye relief is proportional to the fl. So for short fl eps, they have short eye relief. They also top out at 40 to 50 degrees FOV and have only moderately flat fields.

    Up to about 70 degree apparent FOV and decent 15 to 20 mm eye relief the design is a modified plossl. They are sold under various names. They have either more elements, more complex element shapes, more expensive glass or a combination of these. They inherrently cost more to make so the production run is smaller.

    Nagler was the first to take a really different approach to design and came up with the very wide aFOV and good eye relief. These are sold by Tele Vue. Several manufacturers have similar designs but not the reputation yet.

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