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  1. #1
    claws's Avatar
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    Default ES 30mm 82 degree ?



    I probably should post this in the eyepiece sub forum but since I'm a real noob at astronomy, I'm posting it here. I have an XT8 and only two eyepieces now (9mm Ultra Wide and 25mm Sirius plossls). I also have a 2x barlow. I'm thinking about a longer focal length EP and am wondering if the ES 30mm would be a good fit for me and my scope. I'm 65 years old so I imagine my exit pupil isn't much larger than 5mm. I wear reading glasses but don't use them on the scope. I think I'd enjoy the immersed view that the 82 degree EP would provide. Do you all think that this eyepiece would be useful to me or might $300 be better spent on something else?

    Thanks, Kim

  2. #2
    OleCuss's Avatar
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    Default

    For a noob, you're doing pretty darned well! You have a fine telescope, you give us all the most important information for us to have a pretty good idea about your pending investment!

    And yes, I think that eyepiece is likely a pretty good choice for your telescope and your eye. Only you can tell if it is worth the price.

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  3. #3
    claws's Avatar
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    Default

    Thanks for the reply, OleCuss. Almost all of what I've learned so far about eyepieces has been from your excellent sticky on the eyepiece sub forum. I just might go ahead and order the ES30. I think I'll enjoy the view.

    Kim

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  5. #4
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    Default

    I have the exact eyepiece and i love using it. The fov is huge. You can see a ton of stuff and the clarity is awesome. I really enjoy mine. Be warned its really heavy at 2lbs. Lol. Good luck.
    Brett

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  6. #5
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    Default

    I've got the ES82-30mm and use it with a 10" newt -- virtually identical to your 8" dob. It's a fantastic eyepiece that gives me a nearly 2 degree FOV.

    My only caution for you is that there are few objects that really fill that much field in a light-polluted backyard. You have to get under dark skies to really make that much field "worth it" in my opinion.

    If you're observing from light polluted skies, I think the 24mm ES82 would save you some $$ and you'd be just as thrilled with the views and immersiveness. Plus you'd bump the magnification up a bit so you get a little more detail. I use my 18mm ES82 far more than my 30mm when in the backyard (bortle class 5) but use the 30mm quite frequently when in dark sky (bortle class 2-3). Just a point of reference.

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  8. #6
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    Default

    Thanks for your input, skaven. One of the reasons I was considering the 30mm is that I don't have a long focal length ep in my meager arsenal. Since I already have a 25mm ep it seems to me that getting the ES 24mm might be redundant. I do most of my observing from my back yard and there is some light pollution from neighbor's porch lights on occasion, and the sodium vapor street lights in front of my house and throughout our tract every night. Would a 30mm ES 82degree ep be somewhat useless in this situation or would I just not be able to use it to it's fullest extent? Please forgive my ignorance here but I'm trying to understand as much as I can before I make my purchase.

    Thanks, Kim

  9. #7
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    I wouldn't say that it's "useless" by any means. And your justification of not wanting to replicate your existing 25mm is sound logic. The light pollution you're referring to is "local light pollution" and doesn't necessarily impact what you can see in the sky (though it can have a severe impact on your dark adaptation and can cause problems like contrast loss and glare in your scope).

    The "light pollution" that we generally refer to is measured (loosely) on the Bortle scale: Bortle Dark-Sky Scale - Wikipedia, the free encyclopedia

    Assuming you've got the local lights blocked, see where your most common observing location falls on the Bortle scale. If it's 5+, then many large extended objects like M42, M31, and M33 will be washed out at the edges and won't look particularly impressive in a 2 degree field.

    That doesn't mean your 30mm won't get used -- it will! Just remember that there are few objects up there that will fill a 2 degree FOV edge to edge. My advice is more about if you're on a budget and want to get the best bang for your buck. If you don't want to replicate your 25mm, you might start with the ES82-18mm, which is a fine eyepiece in its own right. If you end up feeling like you want more field, you could still get the 30mm in the future.

    It's really all up to you. If you're not sure, visit a local star party and see if you can try one out...

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  11. #8
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    Default

    I have to 100% agree with skaven. Under my LP the 24mm ES is my goto widefield ocular. I have both the 30mm and the 24mm and an XT8! For a quick comparison.

    M45 is great in the 30. It is so far the only EP that showed nebulousity in that object.

    Bodes nebulas, about the same. Slightly brighter cores with 30mm. However, nearby NGC 3077 is only detectable with the 24mm and its darker background.

    Comet Garrad, hands down better in 24mm. Almost undetectable with 30mm. Once again, its all about the darker background.

    I have a 25mm Sirius Plossl as well. The difference from that to the ES is night and day. It would not be money wasted.

    18mm ES 82s are also great EPs. I own one. And it rocks for open clusters and easier to find objects. The slightly larger field of the 24 makes hunting easier.

    FWIW, I'm 32 years old with excellent vision. I typically view in red / orange skies. Can't wait to get them to our "dark site" which is green on a good night.

    Either way you go, it that's an XT8 with the correct tension springs, you need to start thinking "counterweight"

    Clear skies,
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