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Thread: Best High Power EP for 10" Dob

  1. #11
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    Default Re: Best High Power EP for 10" Dob



    I find that I use my 8mm most often, and my 5mm on occasion. I cannot see going below 5mm and getting anything useful with the skies I've been under. I only recently got a Barlow, so I'm really considering Barlowing the 8mm on the next good seeing night I get, just to try it.

    I found personally that the 10mm Plossl was useless to me, but I'm very sensitive to eye relief (even observing without glasses). I can easily focus on detail on my 8mm Stratus, while the 10mm Plossl was just a blur.

    I think that many of us try for the highest magnification we can get, then realize that there's a lot more to see in a wider field. You can barely capture the center of M31 in a wide-field 24. I only learned to appreciate it at 40mm.

    As to the original question, I'd strongly consider something in the 6-8mm range to be the useful max on most nights of the year. I think an 8mm with a barlow would cover even the best situations with a 10" 1200mm scope. If you are collecting EPs, I'd wouldn't go below 4.
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  2. #12
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    Default Re: Best High Power EP for 10" Dob

    As most have said, being able to successfully use really high magnification is a rare occurrence. I have the ES 82░ series (24mm down to 4.7mm). I can tell you from experience that my 8.8mm gets more use than the 6.7mm, and way more use than the 4.7mm. Conditions rarely stabilize to the point that the 4.7mm will perform admirably. In reality, for planets, I wind up using the 14mm, 11mm or 8.8mm the most. While observing Jupiter, start with your lowest power EP first, then work your way methodically higher in magnification (shorter in EP focal length), to determine when the image softens to the point that you cannot discern details well. Depending on the prevailing conditions at the time, there will be times when you can bump your magnification a little higher and maintain a good image, while other times, you just can't. Just the nature of the game.
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  3. #13
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    Default Re: Best High Power EP for 10" Dob

    Quote Originally Posted by MattAGreen View Post
    You can barely capture the center of M31 in a wide-field 24. I only learned to appreciate it at 40mm.
    Matt, I would slightly disagree with that. Your statement is dependent upon how wide of a field EP you are speaking of. In my Z10 with the ES 82░ 24mm, I can capture M31, M32 and M110 all in the same FOV. Therefore, I think it is relative to the focal ratio of your scope, plus the AFOV of the 24mm EP you're using.
    Last edited by KT4HX; 01-30-2013 at 07:56 PM.
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  4. #14
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    Default Re: Best High Power EP for 10" Dob

    Thanks for the really useful advice! I was all up for buying the lowest focal length eyepiece I could but I'm starting to understand how it all tends to work. I will have a look around the 12-16mm range, so if I then Barlow that I will get 6-8mm.

    Also, does using a Barlow reduce the quality of the views?
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    Default Re: Best High Power EP for 10" Dob

    Matt,

    Barlows are generally used for bright objects, and so reduced light throughput isn't critical, but optical quality is. I use Televue Plossls and a TV Powermate, and I reckon the optical quality of that combination competes well with top end small eyepieces.

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    Default Re: Best High Power EP for 10" Dob

    Ok, Thanks
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    Default Re: Best High Power EP for 10" Dob

    The most used eypiece I have is the ES82 24mm in my dob. It probably spends as much time in the focuser as the others put together.....
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    Default Re: Best High Power EP for 10" Dob

    Quote Originally Posted by StarBiker View Post
    Also, does using a Barlow reduce the quality of the views?
    An eyepiece and Barlow combination will have a slightly (2%-4%) dimmer image and slightly lower contrast than the short eye relief/short focal length eyepiece alone that is needed to get the same power as the eyepiece/Barlow combination. If you have an ED Barlow (extra-low dispersion) the difference will not be noticeable. Extra low dispersion glass prevents chromatic aberration because it concentrates and directs the wavelength of light more effectively.

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    Default Re: Best High Power EP for 10" Dob

    I wood not go any higher than a 4mm.

  10. #20
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    Default Re: Best High Power EP for 10" Dob

    Quote Originally Posted by KT4HX View Post
    Matt, I would slightly disagree with that. Your statement is dependent upon how wide of a field EP you are speaking of. In my Z10 with the ES 82░ 24mm, I can capture M31, M32 and M110 all in the same FOV. Therefore, I think it is relative to the focal ratio of your scope, plus the AFOV of the 24mm EP you're using.
    Alan,
    I should've been more specific. In my scope (F/4.7), even an 82* 24mm gives only about 1.6* AFOV. Also, I misspoke. It was a 41mm Panoptic in my friend's scope that gave me the breath-taking view. Over 2* of AFOV gave me good contrast and allowed me to finally really "define" what I was seeing.

    Actually, your 24mm 82* gives a wider FOV than my 40mm Plossl does. I think my 24mm Stratus (an xmas gift) may replace the 40mm Plossl as my wide-field piece moving forward anyway, as the AFOV is so close, I don't think I'll be able to tell, and I'll get more magnification to boot.

    Sorry to muddy the waters.

    Going back to the OP, I do stand by my recommendation of an 8mm as a high-power EP, with the option to Barlow it on those amazing nights. Prior to getting the Stratus 24 and 17 recently, I spent most of my time bouncing back and forth between the 18mm Xcel for medium work and the 8mm for high-power. Very few other EPs got used.
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