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Thread: Medium Power Eyepiece for Dob

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    Default Medium Power Eyepiece for Dob



    What medium power EP would you recommend for my Skyline 8" f/6 Dob? I have the GSO 9mm and 30mm EPs that came with the scope so looking for an EP that falls somewhere between. Would like to keep it under $150. I am a total newb and do not know what would be a good optical match for my particular scope. Would an ES 82* 18mm work well? Or an ES 82* 14mm? Would you suggest an EP with a 2" barrel or a 1.25" barrel or is this just personal preference? Also, I was just using ES EPs as examples as I am open to any brands and APOV. Or, should I just get a 2x Barlow to use with the EPs that came with my scope? TIA
    Scopes: Skyline 8" Dob f/6
    Eyepieces: GSO 9mm and GSO 30mm (came with Skyline Dob); Baader Morpheus 4.5mm, 6.5mm, 12.5mm, 17.5mm; ES 28mm 68*.
    Finders: 8x50 RACI, Telrad
    Binoculars: Bushnell 7x35
    Accessories: Starbound chair, Orion LaserMate Deluxe II

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    Default Re: Medium Power Eyepiece for Dob

    Well medium power for me implies a 2mm exit pupil. Your Dob is f6 so that implies a 12mm focal length eyepiece. The 2mm exit pupil is the one that best matches your eye to the telescope. It minimizes the aberrations in your eye and maximizes the resolution of your scope.

    The bit that is a matter of taste is what AFOV you want to have. Many folks like 82 degrees, I prefer 70. But the best bang for buck spent is at the 2mm exit pupil. The items with a * I have personal experience with.

    *I absolutely adore the KK Orthoscopics and the 12.5mm is excellent at only $100 but the AFOV is about 40 degrees.
    *A TV Plossl at 11mm and under 100$ would fit the bill with a 50 degree AFOV, $95.
    *For a wider 60 degree AFOV I'm finding the Meade series 5000 HD a surprisingly good series at only $75.
    ES has a 62 degree 14mm at about $100.
    ES has an 82 degree 14mm for $169.
    *The Vixen NPL 15 and 10mm could both be had for under $100, 50 degrees.
    If you need long eye relief the Vixen SLV 15mm is about $110, 50 degrees.

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    ST80 (mods for white light solar), SV ED80 f7 Newtonians: Z12 f5 Catadioptrics: VMC110L, Intes MK66 EPs: KK Fujiyama Orthoscopics, 2x Vixen NPLs (40-6mm) and BCOs, Baader Mark IV zooms, TV Panoptics, Delos, Plossl 32-8mm. Mixed brand Masuyama/Astroplans Binocular Nikon Aculon 10x50, Celestron 15x70, Baader Maxbright. Mounts: Star Seeker III, Vixen Porta II, Celestron CG5, Orion
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    Default Re: Medium Power Eyepiece for Dob

    Quote Originally Posted by not_Fritz_Argelander View Post
    Well medium power for me implies a 2mm exit pupil. Your Dob is f6 so that implies a 12mm focal length eyepiece. The 2mm exit pupil is the one that best matches your eye to the telescope.

    If you need long eye relief the Vixen SLV 15mm is about $110, 50 degrees.
    I should have mentioned that I do wear glasses, but to be honest I am such a newb that I don't know yet if I will be viewing wearing my glasses or not. I am near sighted and do have some astigmatism. So, I do have to give eye relief some thought. Also, I should have mentioned I am turning 52 in a couple of weeks, so I am looking through somewhat aged eyes.

    I am also such a newb that I haven't developed a preference for any particular AFOV. Are there any AFOV that would not be a good optical match for a f/6 focal ratio scope? Or does the focal ratio have no impact on AFOV choice?

    My finder EP will be the 30mm GSO Superview that came with my scope that has a 68* AFOV. Should I take into consideration the AFOV of my finder EP when choosing the AFOV of my medium power EP? My 9mm is 52* so I'm not sure if I should get a medium power EP that falls between, such as 62* AFOV. As I increase magnification should I decrease AFOV so that my medium power EP has an AFOV between those of my low power and high power EPs?

    Sorry for the ignorant questions, but I am trying to make an informed decision when I do buy a medium power EP without buying something totally wrong and thus learning the hard way.
    Scopes: Skyline 8" Dob f/6
    Eyepieces: GSO 9mm and GSO 30mm (came with Skyline Dob); Baader Morpheus 4.5mm, 6.5mm, 12.5mm, 17.5mm; ES 28mm 68*.
    Finders: 8x50 RACI, Telrad
    Binoculars: Bushnell 7x35
    Accessories: Starbound chair, Orion LaserMate Deluxe II

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    Default Re: Medium Power Eyepiece for Dob

    Glad I thought to mention a long eye relief option. Televue has a system, Dioptrix, that can attach to eyepieces so that astigmatism can be corrected by the eyepiece but that's a whole different level of cost.

    Your scopes focal ratio doesn't make a difference as far as AFOV is concerned. Where it might make a difference is in which eyepiece design works well. Fast scopes (f4-f5) put more of a strain on some eyepiece designs. Your f6 should be fine with all the designs mentioned. A Konig wide field might not work well so my suggestions included none.

    I wouldn't worry about fitting the AFOV of a new eyepiece to your finder or the ther eyepieces. I'm perfectly happy going from 70 degrees AFOV to 40 when I want to get a really good look at something. My recommendation is to get the best medium power eyepiece you can manage and use that one as the basis of your kit, build out from the medium possibly replacing what you have.

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    ST80 (mods for white light solar), SV ED80 f7 Newtonians: Z12 f5 Catadioptrics: VMC110L, Intes MK66 EPs: KK Fujiyama Orthoscopics, 2x Vixen NPLs (40-6mm) and BCOs, Baader Mark IV zooms, TV Panoptics, Delos, Plossl 32-8mm. Mixed brand Masuyama/Astroplans Binocular Nikon Aculon 10x50, Celestron 15x70, Baader Maxbright. Mounts: Star Seeker III, Vixen Porta II, Celestron CG5, Orion
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    Default Re: Medium Power Eyepiece for Dob

    PS Please don't worry about asking questions. Everybody here is friendly mostly.

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    ST80 (mods for white light solar), SV ED80 f7 Newtonians: Z12 f5 Catadioptrics: VMC110L, Intes MK66 EPs: KK Fujiyama Orthoscopics, 2x Vixen NPLs (40-6mm) and BCOs, Baader Mark IV zooms, TV Panoptics, Delos, Plossl 32-8mm. Mixed brand Masuyama/Astroplans Binocular Nikon Aculon 10x50, Celestron 15x70, Baader Maxbright. Mounts: Star Seeker III, Vixen Porta II, Celestron CG5, Orion
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    Default Re: Medium Power Eyepiece for Dob

    PS PS Also don't worry about the age of your eyes. Spending hours behind the scope can train you to overcome some of the problems of aging. My eyes are about 30% older than yours, for instance. I've lost some sensitivity, about 1/2 magnitude on stars, but I should have lost more like a magnitude. It's practice that prevents the loss from being greater.

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    Default Re: Medium Power Eyepiece for Dob

    I spent five or six very happy years observing with a 12 mm Celestron X-CEL LX as my medium power eyepiece. It had 16mm of eye relief so I had no issues using it with my glasses on, and the 60 degree FOV at 100X gave a TFOV of .5 degree which I found more than adequate.

    Best of all they were inexpensive enough (<$75) that I could afford several of them to cover a nice range. They were my work horses until I upgraded to TV DeLites.

    BTW, If you look at my sig, you'll see my scope is virtually identical to yours.

    Welcome to the board!
    Scope:
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    AD8 w/HALO
    Eyepieces: 2" - 27mm Tele Vue Panoptic, 1.25" - Tele Vue DeLite 18.2mm, 11mm & 7mm, Vixen 9 and 6 mm SLV
    Finders: 8x50 RACI and Rigel Quickfinder
    Binoculars: 10x50 Pentax PCF WP II

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    Default Re: Medium Power Eyepiece for Dob

    The Meade UWA 14mm is another consideration. I’m very happy with mine (I also have the ES 82 24mm you mention and it is amazing! But a bit lower power and slightly more money than what you say you’re looking for).
    Re: 2” vs 1.25: the higher power pieces come in 1.25. I keep an adapter on all of mine that did t come with one, to be able to quickly swap. For lower power, 2” is very nice and comfortable, to me it’s the way to go, but preferences may vary.
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    Properly collimated cornea-lens-vitreous optical apparatus, projecting on retinal sensor slightly limited by deuteranomaly, feeding through stock optic nerves into functional primary cortex, processed through frequently misfiring and buggy integrative cortex.
    Other instruments: Skyline 8" Dobsonian; Celestron Omni XLT 120 w upgraded focuser and diagonal on Stellarvue M2C mount; Oberwerk 25x100 IF; Celestron SkyMaster 8x56. Main EPs: ES 82 24mm and 11mm, Celestron Luminos 19mm, Meade UWA 14mm, Meade HD-60 6.5mm. Filters: UHC, 13%, blue. Finders: RACI, Telrad, RDF, reticle.

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    Default Re: Medium Power Eyepiece for Dob

    Quote Originally Posted by billp View Post
    I spent five or six very happy years observing with a 12 mm Celestron X-CEL LX as my medium power eyepiece. It had 16mm of eye relief so I had no issues using it with my glasses on, and the 60 degree FOV at 100X gave a TFOV of .5 degree which I found more than adequate.

    Best of all they were inexpensive enough (<$75) that I could afford several of them to cover a nice range. They were my work horses until I upgraded to TV DeLites.

    BTW, If you look at my sig, you'll see my scope is virtually identical to yours.

    Welcome to the board!
    I have been seeing good reviews for the X-CEL LXs and the Astro-Tech Starguider Dual EDs (and other brandings). It makes me think, with me being such a newb, that it might make sense for me to buy two of these (two focal lengths) instead of say one ES 82* EP.

    Would a total newb even notice the difference in quality? I would maybe get a 12mm and a 5mm. Or a 12mm and a 2x Barlow. Or is this just crazy talk? I could use these EPs for a couple years to hone my skills and then graduate up to higher quality EPs then. Also, with EPs ~$75 I would be so worried about accidentally dropping one or damaging one in some way.
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    Scopes: Skyline 8" Dob f/6
    Eyepieces: GSO 9mm and GSO 30mm (came with Skyline Dob); Baader Morpheus 4.5mm, 6.5mm, 12.5mm, 17.5mm; ES 28mm 68*.
    Finders: 8x50 RACI, Telrad
    Binoculars: Bushnell 7x35
    Accessories: Starbound chair, Orion LaserMate Deluxe II

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    Default Re: Medium Power Eyepiece for Dob

    Quote Originally Posted by Sauntman View Post
    I have been seeing good reviews for the X-CEL LXs and the Astro-Tech Starguider Dual EDs (and other brandings). It makes me think, with me being such a newb, that it might make sense for me to buy two of these (two focal lengths) instead of say one ES 82* EP.

    Would a total newb even notice the difference in quality? I would maybe get a 12mm and a 5mm. Or a 12mm and a 2x Barlow. Or is this just crazy talk? I could use these EPs for a couple years to hone my skills and then graduate up to higher quality EPs then. Also, with EPs ~$75 I would be so worried about accidentally dropping one or damaging one in some way.
    To improve your observing skills so that you can see quality you need to have at least one eyepiece that is next step ep from what you have.
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    ST80 (mods for white light solar), SV ED80 f7 Newtonians: Z12 f5 Catadioptrics: VMC110L, Intes MK66 EPs: KK Fujiyama Orthoscopics, 2x Vixen NPLs (40-6mm) and BCOs, Baader Mark IV zooms, TV Panoptics, Delos, Plossl 32-8mm. Mixed brand Masuyama/Astroplans Binocular Nikon Aculon 10x50, Celestron 15x70, Baader Maxbright. Mounts: Star Seeker III, Vixen Porta II, Celestron CG5, Orion
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