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Thread: Eyepiece question

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    Default Eyepiece question



    Hi all,

    I just recently got my scope, and haven't picked up any EPs yet (have a couple on loan right now). As I am pretty new to astronomy, I wanted to go to a star party this spring to hopefully take a look at a few different EPs before deciding what to purchase. So the plan is to take my scope and hope that a few people will allow me to borrow an EP to use in my scope so I should have a pretty good idea what I would be getting before buying.

    Obviously, EPs can vary significantly in price, but at this point, I have no idea how much difference there is between a $50 EP and a $1000 TeleVue.

    Are there certain objects in the night sky where the difference between a quality EP vs a cheap EP would be more evident? If so, any recommendation on what objects I should try looking at to get a good idea of the difference in various EPs if I am comparing different ones at a star party?

    Thanks in advance!
    Telescope: Sky-Watcher Esprit 80mm
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    Camera: Canon SL1 (100D)
    Binoculars: Skymaster DX 8x56
    Software: Sequence Generator Pro, Deep Sky Stacker, Star Tools

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    Default Re: Eyepiece question

    Hello Hubbs,

    the most striking difference between the eyepieces is the field of view, the contrast, and the transmittivity of light. You pay money for these three figures of performance.

    I'd test the EPs on the following objects of the season:

    M82 galaxy in UMa: the gap, and at least 2 fairly bright condensations should be visible
    M108 galaxy in UMa: this irregular galaxy with a foreground star ovelayed on its center should reveal at least one of the condensations to the left or right of its middle
    NGC 2903 galaxy below the head of Leo: look for the small bulge at its center, and for the spiral arms
    NGC 4236 galaxy in Draco is with its big apparent size 22.5'x 6.2' a very low surface brightness (15.6) object, and here the differences between the Eps may turn out to be most noticeable

    Be careful, cheap eyepieces offer cheap views, but it is also not necessary to spend more than you really need to, and expect.

    Best,

    JG
    Binoculars: Leica Ultravid 7x42, 8x42HD; Swarovski EL 8.5x42 Swarovision; Nikon 10x70 Astroluxe; Docter Nobilem 7x50 Porro; Jenoptem 7x50W, 10x50W; BA8: 10.5x70, 15x85; 25x100FB, AsahiPentax 8x40, Refractors: Sky-Watcher 150mm/750mm; Leica APO Televid 82mm (25x-50x WW ASPH); EPs:Baader Classic Orthos; Fujiyama ortho, Leica B WW, ultrawide zoom ASPH, Periplan GF, HC Plan S, L; DOCTER UWA; Wild UW mil; Tele Vue Delos, Nagler Zoom, Plössls; Swarovski SW; Pentax XW; ZEISS diascope B WW T*, Carl Zeiss E-Pl; Hensoldt mil; Filters: Astrodon, Astronomik, Baader (CCD), TS;
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    Default Re: Eyepiece question

    Thanks for the advice - next time I'm out I will have to take a good look at these with the eye pieces I have now!
    Telescope: Sky-Watcher Esprit 80mm
    Mount: Celestron Advanced VX
    Camera: Canon SL1 (100D)
    Binoculars: Skymaster DX 8x56
    Software: Sequence Generator Pro, Deep Sky Stacker, Star Tools

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    Default Re: Eyepiece question

    Quote Originally Posted by Hubbs1 View Post
    Thanks for the advice - next time I'm out I will have to take a good look at these with the eye pieces I have now!
    Hello Hubbs,

    much depends of course on the observing conditions, and on your dark adaptation, but these galaxies are at the moment pretty high in the skies.
    The NGC 4236 has required under my backyard skies a pretty expensive Zeiss eyepiece (320 EUR for closure/sales item).

    Happy shooting out your eyepieces,

    JG
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    Binoculars: Leica Ultravid 7x42, 8x42HD; Swarovski EL 8.5x42 Swarovision; Nikon 10x70 Astroluxe; Docter Nobilem 7x50 Porro; Jenoptem 7x50W, 10x50W; BA8: 10.5x70, 15x85; 25x100FB, AsahiPentax 8x40, Refractors: Sky-Watcher 150mm/750mm; Leica APO Televid 82mm (25x-50x WW ASPH); EPs:Baader Classic Orthos; Fujiyama ortho, Leica B WW, ultrawide zoom ASPH, Periplan GF, HC Plan S, L; DOCTER UWA; Wild UW mil; Tele Vue Delos, Nagler Zoom, Plössls; Swarovski SW; Pentax XW; ZEISS diascope B WW T*, Carl Zeiss E-Pl; Hensoldt mil; Filters: Astrodon, Astronomik, Baader (CCD), TS;
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    Default Re: Eyepiece question

    Consider, too, your eyes. How perfect are they? If you vision is anything less than perfect, a high-end eyepiece may not provide enough advantage to be worth the extra price over a mid-range ocular.

    Here are three posts on this forum that go into eyepiece selection in depth. Anyone thinking about eyepieces would do well to read these:

    A Treatise on Optimizing Planetary Views

    A Treatise on Optimizing DSO Observation

    http://www.astronomyforum.net/telesc...eyepieces.html
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    Celestron 8SE, assorted oculars from 6 to 26mm.

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    Default Re: Eyepiece question

    Your camera and scope tell me that you like premium toys. A person like myself tends to try very good accessories and later replace them with premiums as the more expensive prove their small but noticeable performance advantage. Your scope is quite capable of extracting the attributes of the best.
    Bruce
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    Default Re: Eyepiece question

    To make comparisons, you want to be able to swap the eye pieces back and forth in the same scope.
    Mounts: EQ1, LXD55, Atlas EQ-G (one with Rowan belt mod, EQ6-Rail and one without)

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