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Thread: ES 82 deg series EPs

  1. #11
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    Default Re: ES 82 deg series EPs



    Quote Originally Posted by SpyderwerX View Post
    One weighing in at 13.2oz & one at 24.6oz, on your 9.25/CGEM would probably be a negligible difference. If aiming for exit pupil I would probably tend to steer toward the upper of the two , simply for the fact that it would used in a CAT and you will have a slight bit of light fall-off due to the CO of the secondary mirror. On the faintest of objects it can sometimes make a big difference. Ahhh, decisions decisions!
    This is an interesting point. I find the rule more universal and in my SCT and refractors 1.8-2mm works better than 2.4mm on small faint galaxies (which is majority on H2 and H3 lists). The best scenario however is to have both 18mm and 24mm, since 24mm works better on larger faint targets.

  2. #12
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    Default Re: ES 82 deg series EPs

    Quote Originally Posted by Bigzmey View Post
    This is an interesting point. I find the rule more universal and in my SCT and refractors 1.8-2mm works better than 2.4mm on small faint galaxies (which is majority on H2 and H3 lists). The best scenario however is to have both 18mm and 24mm, since 24mm works better on larger faint targets.
    You are absolutely correct that general magnitude, target size and average surface brightness dictates the best focal length and exit pupil. Whether it be galaxy, nebulae, or planetary nebulae, I've never tuned in on a perfect focal length/exit pupil combo that worked well with everything across the board. But yes, the true answer to the equation is to have an eyepiece for every scenario. One can never have too many EP's.
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  3. #13
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    Default Re: ES 82 deg series EPs

    Quote Originally Posted by SpyderwerX View Post
    You are absolutely correct that general magnitude, target size and average surface brightness dictates the best focal length and exit pupil. Whether it be galaxy, nebulae, or planetary nebulae, I've never tuned in on a perfect focal length/exit pupil combo that worked well with everything across the board. But yes, the true answer to the equation is to have an eyepiece for every scenario. One can never have too many EP's.
    Right. It's just that the 2mm exit pupil is an important one to get right because of the human eye aberration optimization thing.

    Once you find a 2mm exit pupil eyepiece you really like one can then collect the rest of the series with some confidence that the aberrations of your eye did not systematically tweak your judgment.
    Last edited by not_Fritz_Argelander; 03-23-2018 at 01:20 PM. Reason: added

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    Default Re: ES 82 deg series EPs

    There's always the Meade 20mm UWA....
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    Default Re: ES 82 deg series EPs

    Like others have mentioned, there's also the ES 68° series to consider. Or the Televue Panoptics @ 68° I have a complete set of 82°'s, but find I use them less and less as I refine and change my observing habits and techniques over time.
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  7. #16
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    Default Re: ES 82 deg series EPs

    Quote Originally Posted by bladekeeper View Post
    The 24mm and the 18mm are both amazing eyepieces, but as Oz mentions, there is a notable size difference.



    They both perform wonderfully in my f/5 12" dob or my f/6.4 5" frac.

    If size wasn't a consideration, I'd be inclined to err on the upper side of the 2mm exit pupil. Either one of these will be nice performers if you pull the trigger on a 14" dob as you've mentioned elsewhere.
    That's a great collection bladekeeper. I only have the 14mm, but it's every bit as good as a 16mm T5 Nagler IMO, plus it has better eye relief.

    IMG_20180311_121709.jpg
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    Default Re: ES 82 deg series EPs

    I use the 24mm ES 82 degree all of the time. It is nice to have in the moderately light polluted area I live in for pulling in relatively faint galaxies, etc. Might just have to look at getting the 18mm after all of the recommendations.
    DB9

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    Default Re: ES 82 deg series EPs

    Quote Originally Posted by Bigzmey View Post
    From my experience, for max contrast is better to go slightly below 2 mm, so 18mm over 24mm.

    But why compromise? ES 68 deg 20mm is great EP and will give you 2mm exactly in your SCT. I tested it side by side with ES82 18mm in my 8" SCT. I was never able to see whole 82 deg in 18mm due to very tight eye relief and other than FOV I liked ES68 20mm better.
    The ES 20mm 68* is a fantastic eyepiece. Although I always start with the 24mm 82* for its wider TFOV (or for viewing extended objects), most of my eyepiece time is with the 20mm. 100X mag with a 2mm exit pupil.

    The 20mm 68* also is a fantastic match with the ES AR102 refractor.
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