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Thread: Explore Scientific 100 degree 9mm or 14mm?

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    Default Explore Scientific 100 degree 9mm or 14mm?



    I was at a star party on the weekend and had the privilege of trying out a TeleVue Ethos 13mm and was completely blown away by the view. I never thought I would notice that much difference with my sco. pe and eyes.

    There is no way I can justify(or afford) spending 2x the cost of my scope on an eyepiece so I did some looking and saw the ES eyepieces had very comparable reviews for far less money. Am I better off getting the 14mm or the 9mm? I would mostly use it for DSO's. Is it advisable to get a 2" barlow to use with the 100 degree eyepieces because then it would be hands down the 14mm to me.
    Sky-Watcher BK Dob 14" SynScan
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    Default Re: Explore Scientific 100 degree 9mm or 14mm?

    Quote Originally Posted by MrFancypants View Post
    Am I better off getting the 14mm or the 9mm?
    It is undoubtable that you are better off with BOTH. it is undoubtable that your bank account is better off with neither.

    Over the last 20 years, I have used my 13mm EPs a lot more often than my 9mm EPs in scopes ranging from 6" AP APO, C11, and 20"DOB.
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    Default Re: Explore Scientific 100 degree 9mm or 14mm?

    I agree with MitchAlsup! I have a Z8 and use the 14mm a little more.

    Lets look at the data: the 14mm will give you 85x with a TFOV of 1.2°, while the 9mm will yield 133x with a TFOV of 0.8°. In most scopes I use a spend a majority of my time at ~75x to 100x for most DSO's.

    Don't beat yourself up, once you buy one... you'll have get the others.

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    Default Re: Explore Scientific 100 degree 9mm or 14mm?

    Quote Originally Posted by Jimi View Post
    Don't beat yourself up, once you buy one... you'll have get the others.

    That's exactly what I'm afraid of.
    Sky-Watcher BK Dob 14" SynScan
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    Default Re: Explore Scientific 100 degree 9mm or 14mm?

    They also make a 25mm one for about $600....that's still $50 cheaper than 13mm Ethos. All I can afford to do is look at pictures of them without my wife killing me
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    Default Re: Explore Scientific 100 degree 9mm or 14mm?

    Quote Originally Posted by AbbN View Post
    They also make a 25mm one for about $600....that's still $50 cheaper than 13mm Ethos. All I can afford to do is look at pictures of them without my wife killing me
    Don't forget about the 9mm 120 degree that is on sale for $1000.
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    Default Re: Explore Scientific 100 degree 9mm or 14mm?

    Resistance is futile...prepare to be assimilated!
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    Default Re: Explore Scientific 100 degree 9mm or 14mm?

    Your XT8 is an f/5.9, so the "optimal" focal length (2mm exit pupil) is 5.9*2 = 11.8mm. That's dead center between the 9mm and 14mm. So I'd probably lean toward the 14mm if I were you, but start saving right away for the 9mm :-)
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    Default Re: Explore Scientific 100 degree 9mm or 14mm?

    Quote Originally Posted by skaven View Post
    Your XT8 is an f/5.9, so the "optimal" focal length (2mm exit pupil) is 5.9*2 = 11.8mm. That's dead center between the 9mm and 14mm. So I'd probably lean toward the 14mm if I were you, but start saving right away for the 9mm :-)
    Skaven
    I notice you have the Zhumell 2" 2x ED Barlow. This is probably my next purchase. I also have my eye on the ES 100* 20mm. Would it be too much to use these together? I suspect with the size of the 20mm 100* with the Barlow I might be standing miles back from the focusser and the Dob would need scaffolding to keep it up... Any thoughts?
    Bart

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    Default Re: Explore Scientific 100 degree 9mm or 14mm?

    I regularly stack my TV Type 2 Paracorr, TV 4X Powermate, and ES 100* 20mm. It's a long stack and looks funny, but doesn't cause any problems other than needing a counterweight.
    Name: Sam
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