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Thread: Eyepiece upgrades and some other ?'s

  1. #1
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    Default Eyepiece upgrades and some other ?'s



    Nothing but clouds in the sky lately. This gives me time to look at my gear and consider, how best to empty my wallet.

    My questions are underlined.
    I also much appreciate any other perspectives/comments.

    I have two telescopes, a 6" f/8 dob and an achromatic 102mm f/10 frac.
    The dob has a 1.25" focuser.
    The frac can take 2" EPs, but I only have a 1.25" star diag.
    So, upgrading to 2" EPs would involve upgrading my dob focuser and buying a different diag.
    (As an aside, how much of a difference would upgrading the 1.25" diag to a dielectric diag make? Kind of a pricey upgrade and likely not the most bang for the buck with my current gear)

    Current eyepieces:
    • GSO Super-Plössl 32mm -- use all the time as "finder" and for making neighbors go "wow" when they see the moon. I like this EP
    • Orion Sirius Plössl 25mm -- came with the dob and is decent, but nothing to write home about
    • Celestron 25mm Plössl -- came with the frac. Same as above, nothing special here.
    • Orion Sirius Plössl 10mm -- came with the dob. Eye-relief is terrible. Views are not at all pleasing. This is problem!
    • ES 82° 6.7mm -- speaks for itself.
    • Orion 2x Shorty Barlow -- nothing special. Would a better Barlow be worth the money?
    • Celestron Micro Guide 12.5mm -- specialty piece I someday want to use more for measuring separation and position angles of doubles. Now that I have an EQ mount, this is possible (but not through clouds).


    I ran Gabby's eyepiece calculator for the telescope focal length and have come up with something along the lines of a 5", 10", 15", 25", and 42" to make a good set for either scope.
    For a 42", I will need to upgrade to 2" diag/focuser.

    Anyway, I am tempted to just buy better Plossl's, like


    I can do this now without breaking the bank.

    Otherwise, it will be piece by piece over many months to come, adding on things like Explore Scientific (the 62 series is on sale this month).
    If I am going to buy "premium" eyepieces, should I buy longer focal length or short focal length first?
    Which will show more chromatic aberration through my achromatic frac?


    So my question really comes down to if these Agena and GSO Plossls are really a value/upgrade or do I need to wait?


    Thank you,

    Daniel

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    Telescope: Orion SkyQuest XT6 f/8, Celestron Omni XLT 102mm f/9.8
    Binoculars: Nikon Action Lookout IV 10x50mm, Vortex Diamondback 8x42mm
    Eyepieces: GSO Super-Plössl 32mm, Sirius Plössl 25mm, Sirius Plössl 10mm, ES 82° 6.7mm, 2x Barlow, Celestron Micro Guide 12.5mm
    Finders: Telrad, GSO 8x50 RACI

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    Default Re: Eyepiece upgrades and some other ?'s

    Also, I live under light polluted skies, so mostly look at moon, planets, and especially ... double stars.
    So crisp, high mag views, is the name of the game.

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    Telescope: Orion SkyQuest XT6 f/8, Celestron Omni XLT 102mm f/9.8
    Binoculars: Nikon Action Lookout IV 10x50mm, Vortex Diamondback 8x42mm
    Eyepieces: GSO Super-Plössl 32mm, Sirius Plössl 25mm, Sirius Plössl 10mm, ES 82° 6.7mm, 2x Barlow, Celestron Micro Guide 12.5mm
    Finders: Telrad, GSO 8x50 RACI

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    Default Re: Eyepiece upgrades and some other ?'s

    I would start with some Celestron X-Cel LXs unless you can afford the ES 62s or 68s. I would not get plossls as an upgrade. Since you have the 32mm and the 6.7mm and they work well for you, I would start with the 12mm and 18mm and finally the 25mm.

    https://agenaastro.com/celestron-12m...ece-93424.html
    https://agenaastro.com/celestron-18m...ece-93425.html
    https://agenaastro.com/celestron-25m...ece-93426.html

    The only thing I use a Barlow for is very high magnification instead of buying a dedicated EP for that. You may benefit from a better Barlow, I would not.
    At some point I would upgrade to a 2" diagonal and a couple of 2" EPs

    https://agenaastro.com/gso-2-90-99-d...-diagonal.html
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    ACF 8"SCT,
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    Default Re: Eyepiece upgrades and some other ?'s

    Looking at what you have and what you're happy with and what you're not so happy about.....

    Exit pupil rules the choice of eyepieces. The things you are looking at currently are small improvements perhaps but not upgrades. The first priority would be having something good that gives a 2mm exit pupil with each scope. That means a 16mm focal length for the Newt and a 20mm focal length for the refractor. The 2mm exit pupil should get all the things resolved that are seeable in bright objects. You can magnify higher to get a 1mm exit pupil too (8mm for the Newt and 10mm for the refractor).

    (To get an eyepiece at a certain exit pupil you multiply the desired exit pupil by the f ratio of the telescope.)

    Since your dob is f8 and your refractor is f10 I'd suggest that designing to the average of the two, f9, is good enough if you want one set of eyepieces for both scopes. That suggests an 18mm and a 9mm eyepiece.

    This is what I'd recommend.

    https://agenaastro.com/kokusai-kohki...iece-18mm.html

    https://agenaastro.com/kokusai-kohki...piece-9mm.html

    Very contrasty, gives darker sky background and very fine planetary and lunar detail. They do have a narrow FOV. But they are just the tops. There is no upgrade from these that doesn't cost more money than God has.

    If the narrow FOV bothers you, which might be a problem depending on how you use your Dob then these guys will do well:

    https://agenaastro.com/televue-1-25-...ce-17-3mm.html

    https://agenaastro.com/televue-1-25-...iece-10mm.html
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    Default Re: Eyepiece upgrades and some other ?'s

    Thank you both!

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    Telescope: Orion SkyQuest XT6 f/8, Celestron Omni XLT 102mm f/9.8
    Binoculars: Nikon Action Lookout IV 10x50mm, Vortex Diamondback 8x42mm
    Eyepieces: GSO Super-Plössl 32mm, Sirius Plössl 25mm, Sirius Plössl 10mm, ES 82° 6.7mm, 2x Barlow, Celestron Micro Guide 12.5mm
    Finders: Telrad, GSO 8x50 RACI

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    Default Re: Eyepiece upgrades and some other ?'s

    I am with n_F_A

    The Tele Vue Delos reduced to 306 USD is a great choice, and I'd take on your place the both Delos (Deloi), or at least the 10mm one. The 10mm focus is one of those focus lengths critical to the eyepiece performance on any scope you have, or you might add to your arsenal in future.

    Should you mind the Delos made in Taiwan, then you can have a look at the offers on the Pentax XW 10mm made in Japan. The Pentax XW 10mm and 7mm are the kings of the XW series. Regarding the longer focus lengths, the TV Deloi might be better, or even not, the differences are subtle, and they are often just a matter of taste.

    The orthos are somethings, the observers should grow into. But they belong to the arsenal anyway, as they are the eyepieces of last resort when you dig into the details on the planets or details in the nebulae and galaxies.

    Happy shopping,

    JG
    Last edited by j.gardavsky; 11-25-2017 at 09:01 PM. Reason: spelling
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