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Thread: Help me !

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    Default Help me !



    I'm getting ready to get my first EP upgrade. I am leaning towards Explore Scientific 20 mm - 68° Argon-Purged Waterproof 1.25" Eyepiece.

    If you could have only one EP in your arsenal for all around viewing, would you choose 20 mm or 25 mm? Which brand? 200.00 or less budget.

    I'm sure this has been asked before, but I couldn't find it in previous posts.

    Thanks in advance for your help.
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    Default Re: Help me !

    Quote Originally Posted by OBXgirl View Post
    If you could have only one EP in your arsenal for all around viewing, would you choose 20 mm or 25 mm? Which brand? 200.00 or less budget.
    If could have one and only one EP it would have to be my Meade 8-24mm zoom because of it's versatility. I had this zoom before I ever bought any of my good separates. All my other EP's have specific uses.

    Good luck!
    Abb
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    The Bible tells us God created the Universe; Science tells us how He did it; And through my telescopes I marvel at His handiwork

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    Default Re: Help me !

    The 24mm ES68 works very well at the longer focal ratios and is a great quality EP. It gave me a great view when I used it in my C8 at f/6.3 using the focal reducer - I assume using with your focal reducer?. It would provide the max field of view with 1.25" hardware. After that a 14mm eyepiece or thereabouts which gives you an exit pupil of 2mm for detail in deep sky objects.
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    Default Re: Help me !

    You can never go wrong with an eyepiece in this range. I have an 18mm Radian that I use all the time. Amazing eyepiece but discontinued by TV. They can be found used quite often.
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    Default Re: Help me !

    I see that you have a set of Plossls and it appears that you wish to fill a perceived gap in your line up between the 17mm and the 32mm. Perhaps the best question to ask yourself is what do you want to improve upon your current eyepieces and what are your favorite objects to view? All around viewing can mean very different things to different observers. If you want a wider view at a favorite focal length, the ES would be a good choice, but if you chose the 24mm its wider field would be very close to the view that you have in your 32mm Plossl and the 20mm is not that much shorter. An 82 degree ES eyepiece would also be within your budget and the 82's really begin to create a different view from your Plossls by offering similar fields at much higher magnifications, so you see things against a much darker sky, but the added magnification also means that faint targets will disappear. You could also try a premium Ortho (Baader or Fujiyama) in this price range if you are looking for the best contrast, sharpness and detail in your views, and rely on your guided mount to compensate for the narrower field. I suggest that you begin cataloging your viewing sessions and make notes of which characteristics in your views that you want to improve. This should lead you to a specific focal length and/or type of eyepiece that will best provide what you are currently not able to see.

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    Default Re: Help me !

    Quote Originally Posted by OBXgirl View Post
    I'm getting ready to get my first EP upgrade. I am leaning towards Explore Scientific 20 mm - 68° Argon-Purged Waterproof 1.25" Eyepiece.

    If you could have only one EP in your arsenal for all around viewing, would you choose 20 mm or 25 mm? Which brand? 200.00 or less budget.

    I'm sure this has been asked before, but I couldn't find it in previous posts.

    Thanks in advance for your help.
    For your scope ES 68 20mm or 24mm will work great. 24mm will nicely fill gap between your 17 and 32mm EPs, and works well on all types of targets in my 8" SCT. 20mm will be a bit better on galaxies since it provides 2mm exit pupil - sweet spot for faint targets. But at the end you can't go wrong with either. Both are great EPs.
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    Default Re: Help me !

    The higher focal ratio of your scope would mean that many eyepieces will work well. My understanding is that the Televues (and the like) are well corrected for aberrations exacerbated by faster optics. Given this other factors might prove to be more important: field of view or eye relief perhaps. I love decent eye relief and the big lenses these eyepieces use and find them quite immersive, although others feel they make you look at the surface rather than through the glass. An option here, with 20mm of ER, are the Baader Hyperions. As Trombatissimo points out filling a gap isn't always the best option, but rather having a wider FoV or gaining more ER at your favourite magnification might prove more rewarding?
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    Default Re: Help me !

    The 18mm explore scientific 82 degrees might also be a good option to consider. The 18mm 82 will give you a bigger true field of view as compared to the 20mm 68.

    Also the 18mm ES 82 has gotten a lot of praise based what I read . Take a look at its online reviews. I do not own own because I already have a widefield 17mm. If I did not own a 17mm widefield, I would have purchased the 18mm ES 82
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    Default Re: Help me !

    Thanks for the feedback. Y'all have given me some great info and a lot to consider. Feel like I can make a more informed choice. Thanks again.
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    Default Re: Help me !

    Quote Originally Posted by OBXgirl View Post
    I'm getting ready to get my first EP upgrade. I am leaning towards Explore Scientific 20 mm - 68° Argon-Purged Waterproof 1.25" Eyepiece.

    If you could have only one EP in your arsenal for all around viewing, would you choose 20 mm or 25 mm? Which brand? 200.00 or less budget.

    I'm sure this has been asked before, but I couldn't find it in previous posts.

    Thanks in advance for your help.
    You have a pretty complete set of Plossls which provide good contrast and are also fine for general purpose viewing. In terms of exit pupil a 20 mm wouldn't function that much differently than the 17 mm already in your kit. Even a 25 mm wouldn't change things so much. With your existing set my first priority would be to go long to get a 5mm exit pupil. This would add the capability of showing low contrast larger objects well (think Horsehead Nebula). There are a few 50mm eyepieces out there. Any would work in your Edge. I use a Takahashi 50mm LE in mine. GSO makes a set of wider field eps at 50, 40, 30 mm that are more economical.

    I'm not really answering your question though and it's largely because I think only a drastically different exit pupil will give you an additional capability with your scope.
    Last edited by not_Fritz_Argelander; 05-05-2017 at 10:32 AM.
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