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Thread: Not another ES 82 thread...re: 24 or 30mm

  1. #11
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    Default Re: Not another ES 82 thread...re: 24 or 30mm



    I've read there are 2 generations of the ES30 82, but the only model number I've seen is the EP3082-00.
    Any insight into this? I've seen one for under $200 that says it is a discontinued version. I understand it has to do with the ability to get your eye closer to the lens.

  2. #12
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    Default Re: Not another ES 82 thread...re: 24 or 30mm

    I think the optics are similar but the main difference is the newer ones have a rubber flip up eye relief while the old one I think had a twist up adjustable one.
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  3. #13
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    Default Re: Not another ES 82 thread...re: 24 or 30mm

    The first gen can be had for $189 on one sight, 2nd gen is $249-wondering about the $60. Is the twist up not high enough to get your face close, but the flip up is? or is there a difference in the barrel as well?

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    Default Re: Not another ES 82 thread...re: 24 or 30mm

    The generation 2 ES82 are Nitrogen purged and wont fog. You can even clean them under running water. Have read somewhere that each ocular is pressure tested under a meter of water (so presumable waterproof).

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    Default Re: Not another ES 82 thread...re: 24 or 30mm

    I have a question related to the choice the op asked about. I find myself asking the same question now that my lady wife, bless her, suggested I should go ahead and order another eyepiece.

    The 24mm is .5 lbs lighter than the 30mm and at present about $50 cheaper. Would people say the wider field of view is worth the extra weight and $$? I have a cheap Owl 30mm 80* and like the wide field it has altho it is not near the viewing quality I am expecting in the ES 82* 30mm.

    Any further thoughts or hands on info would be appreciated. By the way it would be used on an 8" f/5 and 12.5 " f/5.9 dobs.

    Thanks
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    Default Re: Not another ES 82 thread...re: 24 or 30mm

    Bugs- The 24mm FOV is actually too much for me and it rarely gets used. Too much light leaks in for me and the field is really really wide. Surprisingly so. As it is with the 18mm I have to move my head to take in everything that is there and with the 24, when I do use it, I really have to move my head. So the 30 is going to be stunning and the 24 is very close to 30's and 40's I have looked though in other's OTA's.
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  7. #17
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    Default Re: Not another ES 82 thread...re: 24 or 30mm

    Hi lvsaint,

    I have a similar OTA as you (10" f/4.7) and I own the ES82 30mm. The combination gives me a 2 degree TFOV and a (30/4.7) 6.4mm exit pupil. Personally, I find the exit pupil too large. It exacerbates the effects of surface irregularity of my eye, and so the image isn't as crisp as I'd like. Also, the 2 degree TFOV is the maximum you can get in a 2" focuser with a f/4.7 scope. As it's a fast scope and aberrations like coma get worse the further you go from the center of the field, the edges of the field are quite smeared. The huge TFOV is also not particularly useful on many objects. It's nice for the Pleiades, M31, and the Veil nebula, but generally it gets used in my scope as a "super finder" -- hardly worth the hefty price tag in my case.

    It's an incredible eyepiece for sure -- well built, and in a slower scope (or with a Paracorr) it would be ideal for low magnification views. But if I had it to do over again, I'd go for the ES82 24mm instead. The smaller exit pupil and narrower true field would make for a clearer, more comfortable view.

    If you're waffling between the 30mm and 24mm, consider my advice quite clear to go for the 24mm.

    For others that are reading this thread -- note that my comments are strictly related to a fast f/4.7 scope. With a slower scope (such as the XT8 with its f/6), the 30mm would work just as well as the 24mm would in a f/4.7 scope, as it would result in a more manageable 5mm exit pupil.

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    Default Re: Not another ES 82 thread...re: 24 or 30mm

    Quote Originally Posted by lvsaint View Post
    I am interested in DSOs - globular clusters and nebulae especially.
    FYI, if you are looking to improve the views of globular clusters, a low magnification eyepiece is the wrong direction. Since stars are specular in nature, adding magnification (up to a 1mm exit pupil) does not increase their apparent size. The result is that the background gets darker while the stars stay the same brightness. Thus more magnification == you see more stars.

    For viewing globs, I would recommend a wide AFOV ~5-6mm eyepiece, such as the ES82 6.7mm or 4.7mm. Or perhaps the 8.8mm with a barlow for nights of good seeing.

    Nebulae are another story, and tend to require low magnification (mostly due to their size, not brightness). So in that respect, a wide field 24mm eyepiece would be a great match for observing large nebulae like M42 and M8. What I find makes the biggest difference when observing nebulae though is a good filter. A narrowband filter like the Orion ultrablock can make many nebulae appear with more structure and greater contrast. Not all nebulae respond well, but many do. For supernova remnants like planetary nebulae, M27 and the Veil nebula, an OIII filter does wonders.

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    cbrucker (11-09-2012),Joe Timmerman (11-09-2012)

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    Default

    Quote Originally Posted by skaven View Post

    FYI, if you are looking to improve the views of globular clusters, a low magnification eyepiece is the wrong direction. Since stars are specular in nature, adding magnification (up to a 1mm exit pupil) does not increase their apparent size. The result is that the background gets darker while the stars stay the same brightness. Thus more magnification == you see more stars.

    For viewing globs, I would recommend a wide AFOV ~5-6mm eyepiece, such as the ES82 6.7mm or 4.7mm. Or perhaps the 8.8mm with a barlow for nights of good seeing.

    Nebulae are another story, and tend to require low magnification (mostly due to their size, not brightness). So in that respect, a wide field 24mm eyepiece would be a great match for observing large nebulae like M42 and M8. What I find makes the biggest difference when observing nebulae though is a good filter. A narrowband filter like the Orion ultrablock can make many nebulae appear with more structure and greater contrast. Not all nebulae respond well, but many do. For supernova remnants like planetary nebulae, M27 and the Veil nebula, an OIII filter does wonders.
    I would not suggest the 6.7 or even worse the 4.7 mm EP for globular clusters. With those ep's, the cluster would be very dim and focus would be very difficult. The highest mag EP I would recommend would be the 8.8mm. The more powerful ep's would be for planets and extremely bright objects. In my z12 f4.9 the 6.7 or 4.7 stars get very dim and distortion can be very bad.

    Many globs and open clusters look amazing in the 18mm and 11 mm EP. The larger clusters are amazing in the 30mm
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    Default Re: Not another ES 82 thread...re: 24 or 30mm

    I have the 24, 18, 14, 8.8, 6.7 and 4.7. My first one was the 24mm, and I am totally happy with that choice. I used my mid-sized scope, the Z10, as my guidepost to what I chose as my low power EP as it is the one I deploy most often. The 24mm gives me 52x, 4.9mm exit pupil, and 1.6 deg TFOV in the Z10. In comparison, the 30mm would give me 42x, 6.1 exit pupil, and 1.97 deg TFOV. For me, at my age, I don't think the 6.1 deg TFOV would work well for me. The added bonus of it being less expensive and lighter are also good points. In reality, while I really like the 24mm, I wind up using my 18mm more than any other. The 18mm gives me 69x, 3.9mm exit pupil, and 1.2 deg TFOV. It is a solid DSO hunting EP.

    As for the globs, I would recommend the 8.8 as a good general glob EP. The 6.7 is good, but would be a little more finicky during times of poor seeing.
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