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  1. #1
    dajebriza's Avatar
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    Default Please Help: Low Power/Wide FOV 1.25 EP's - What are my choices?



    I have been looking at the message boards and online stores trying to find the options available for a low power/wide FOV EP for an 8SE. I am getting a Hyperion Zoom so I am looking for EP suggestions to cover the top of the 24MM zoom range where it has the smaller FOV and beyond.

    I have found some 24mm mid-range high FOV EPs, but can't seem to find the lower power EPs. There are plenty of 40mm EPs in 2" but I am not having any luck in the 1.25"

    What are my options for 38-40mm and beyond EPs in 1.25" that have a FOV above 60 degrees? I don't want to pay $200+ for one, so I'm looking more in the $75 - $150 range. What mm would you recommend for the top range of my 8SE above the range of my zoom lense?

    Suggestions?

  2. #2
    Joe Lalumia's Avatar
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    Default

    Something like this:
    OWL Astronomy Products - Ultra-Wide Eyepieces

    and or

    Baader Hyperion-Aspheric Eyepiece - 36mm

    The Hyperion Aspheric can be used as a 1.25 inch and a 2 inch-- by changing the nose-piece.
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  3. #3
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    Default

    I am a beginner too, but I had a similar question and did some searching around.
    For 1.25" eyepieces:
    In the 68 degree category (panoptic, baader hyperion), the longest focal length you can get is 24mm. This gives you close to the max field of view possible in a 1.25 format.
    In the 50 degree category (plossls), the longest focal length you should get is about 32mm. Longer focal length plossls don't offer a wider real field of view. 32mm plossl type eyepiece gives you close to the max field of view possible in a 1.25 format.

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  4. #4
    Bob327's Avatar
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    Default

    Best way to satisfy you now and in the long term would be to just buy a 2 inch Diagonal (agena sells the 2 inch GSO for under 70 bucks ) and buy a Williams optic 33 mm 2 inch eyepiece (72 degree FOV) from the same place for a little over 100 bucks (I just checked and the diagonal currently goes for 68 dollars and the eyepiece goes for 110 dollars

    I own an 8i (earlier model of your scope and it should be able to clear the base of the scope IF you slide the OTA forward a little...

    you can then use both 1.25 inch eyepiece and 2 inch eyepiece in your 2 inch diagonal

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  5. #5
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    Default

    Look at the OPT web site. They let you look at eps by focal length and have a broad selection.

  6. #6
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    Default

    I just purchased the Orion Highlight Plossl 32 mm for about $35 and Im very pleased. But, I am new to all this and dont really know a whole lot.
    My only other experience was with the standard Orion eyepieces in 20 and 10, but I do know, the 32 Highlight is a lot nicer to look thru.
    Everything seems to be a bit brighter, bit more clear and the field of view is so much better then the standard EP.
    Hope this helps.

  7. #7
    Joe Lalumia's Avatar
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    You will find that some of those OLDER amateur astronomers are just a little too tied up in the MATHEMATICS of optical design. Looking through an eyepiece is the only way to really tell if it will be good in your scope.

    Field illumination, field stops, apparent field of view -- etc etc --- sometimes are bogus in the real world.

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  8. #8
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    Default

    I'm pretty sure that you can't have a 60 degree field of view in a 38-40mm eyepiece in a 1.25" format. To get that wider field of view with that longer focal length is the main reason why 2" eyepieces are made. The eyepiece that lager is pointing out would be about the max field of view that a 1.25" piece could give. 50 or so degree in a 32mm eyepiece sounds about pretty close to the max of a 1.25" off of the top of my head.

  9. #9
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    Default

    Since no one's mentioned it, I'll just Tosh this out there: You don't have to buy a 2" diagonal (and expensive 2" EPs) to get clean, flat low mag widefield views.

    With a good 6.3 focal reducer, you can get pretty close to your maximum unvignetted true FOV with 1.25" EPs. In addition, the FR is actually a reducer/ corrector which compensates for a lot of the inherent field curvature in an SCT's FOV. It provides very pleasing views of extended objects. I think you'd get a TFOV of near 1.3 degrees (I seem to recall a figure of 1.27) with either the 24 Panoptic or the 24ES68 (and maybe even the 20mm Meade 5000 UWA, if it ever coalesces from vaporware).

    One disadvantage with the 6.3FR is that I can't quite clear zenith with the FR on the back of the scope, the visual back attached to the FR, and the stock 1.25" Celestron diagonal attached to the FR. But I can get darn close, maybe 88 degrees, which is enough.

    FWIW, Televue claims that a c8 with 6.3FR and Televue Everbrite short 2" diagonal gives an effective F/5.5. When used with a 27 Panoptic, they say it gives a TFOV of 1.5 degrees.
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  10. #10
    reborn's Avatar
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    I think in 1-1/4 inch your best bet is a 32mm plossl. If you really just want a 68° eyepiece the 24 panoptic is 1-1/4 barrel too but expensive. The plossl will give you the same true field but less magnification at 1/3 the cost. I think to get over one degree fields you have to go to 2inch barrels.
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