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Thread: updrade My Plossl?

  1. #1
    Juno16's Avatar
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    Default updrade My Plossl?



    Hi Everyone!

    I'm asking for a little advice or a point in the right direction concerning an eyepiece choice.
    As you can see in my signature, I have a Celestron Nexstar 130 SLT scope. A modest reflector, but it has really opened my eyes to the skies.
    When reviewing observations that I have made with the scope, it seems like about 80-90% of my best views have been with my Highpoint Scientific 12mm plossl. In this scope, it only yields 54x, but gives me the best and sharpest views considering my equipment and orange LP skies. I am considering purchasing a better 12mm eyepiece and possibly a Celestron X-CELL. I already have a 5mm X-CELL, but except for lunar observations and double star observations, it has seen limited use due to atmospheric conditions.
    Any recommendations for an upgrade? The price range of the X-CELL ($60-$80) is my goal. I would like to keep close to the 12mm size, but if the thought is that upgrading the plossl won't be much of a benefit, maybe a 9 or 10 mm might be a better choice?

    God bless the men and women who sacrificed, serve, and served in the Armed Forces!

    Thanks,
    Jim
    Scopes: Explore Scientific ED102 Triplet APO, Celestron Nexstar 130 SLT.
    Mounts: Celestron AVX with Orion MM Autoguider, SLT; Binoculars: Bushnell 10X50;
    Camera: Nikon D3300 and D5300(unmodded), Astrophotography Tool, PHD2, SharpCap v3.2, StarTools, PE14
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    Default Re: updrade My Plossl?

    Once you get below 10mm the eye relief on a Plossl becomes problematic, especially if you wear glasses. If you screw your 2X Barlow lens assembly into your 12mm Plossl you will get the equivalent of a 9mm EP.
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    David aka Shelldrake
    Equipment: Sky-Watcher 305mm
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    (f/5), EQ6-R, AZ3 mounts;
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    StarBlast 4.5 reflector (f/4), ED80T-CF refractor (f/6); Celestron 200mm SCT (f/10), 102mm refractor (f/10.3), NexStar GT
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    mount; Jason 313 60mm refractor (f/15.2, EQ1 mount); Celestron 10x50, 8x56, 15x70 binoculars; Eyepieces: SWA 32mm (2"); 32mm Plossl; 25mm, 18mm, 12mm, 9mm X-Cel LX; 6.7mm ES 82; 5mm X-Cel; Meade 8-24mm Zoom; Orion Shorty 2X
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    , GSO 2.5X Barlow, Antares 3X Barlow; Cameras: ASI224MC, ASI183MC, Canon T3
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    Default Re: updrade My Plossl?

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    Default Re: updrade My Plossl?

    Your scope is f5 and the human eye sees most detail at around a 2mm exit pupil. So the eyepiece that will show the most detail is 5x2 = 10 mm focal length. Shorter will magnify but not show more detail.
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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: updrade My Plossl?

    Quote Originally Posted by Juno16 View Post
    it seems like about 80-90% of my best views have been with my Highpoint Scientific 12mm plossl. In this scope, it only yields 54x, but gives me the best and sharpest views considering my equipment and orange LP skies. I am considering purchasing a better 12mm eyepiece and possibly a Celestron X-CELL.
    If you mean DSOs under *good views* than no surprise since the 12mm EP gives you exit pupil of 2.4mm (=12/5) which is good for many faint DSOs. I guess you're saying about the Celestron X-Cel LXs, not about just *X-Cels* (big difference!). It would be a good upgrade, IMO.

    Quote Originally Posted by Juno16 View Post
    Any recommendations for an upgrade? The price range of the X-CELL ($60-$80) is my goal. I would like to keep close to the 12mm size, but if the thought is that upgrading the plossl won't be much of a benefit, maybe a 9 or 10 mm might be a better choice?
    The 9mm eyepiece is not an alternative, you may need both! And plossl upgrade would be a big benefit for your f/5 scope since X-Cel LXs or similar wide angle eyepieces are better corrected off-axis. But, of course, it's a good idea to keep the spread at ~1.4-1.5x, like 8mm and 12mm or 9mm and 14mm. The most important exit pupils for DSOs are 1.8-2mm and 2.5-2.8mm, IMO. As for the brands, the Meade HD-60s mechanics are better, but the Celestron X-Cel LXs are cheaper, both have the same optics. Optically similar the Agena Starguider EDs also would be a nice choice, IMO.
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    Zhumell Z8 8" f/6 Dob; Meade 2090 90mm Achromat.
    DSO setup for the Dob: 32mm Agena SWA, 20mm ES68, 18mm & 11mm ES82, 14mm & 8.8mm Meade 5K UWA, 12mm TV Delos, 6.5mm Meade 5K HD-60. Planetary setup: 6mm & 10mm BCO, 8mm RKE, 7mm Antares Ortho; RO Zoom 7-20mm; 1.25" 2x Meade TeleXtender, 2" 2x AT ED
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