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  1. #1
    Candymancan's Avatar
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    Default Eye peice question



    I recently purchased a 10" Zhumell Dob scope i havent got it yet but it comes with a 30mm 2" Plossel and a 9mm 1.25" Plossel. I currently have eye peices from my previous scope but i doubt there any good but they are 25mm, 12.5mm,4mm They have the letter H next to the size's. Would these be ok for using now ? Im going to buy other eye peices later when i get more money but i just got bashed on other astronemy forums for not getting the 5 or 8" scope and 2 or 3 eye peices lol.

  2. #2
    trevorw's Avatar
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    Default

    The H would imply they are simple two lens Huygen EP's better suited to higher f ratio scopes but should work

  3. #3
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    Default

    G'day Candymancan,

    Plossl EPs are far superior your older Huygens. Like Trevor, they are better suited to longer or slower focal ratios as their simple two lens system would show a large amount of distortion in the view away from the central image in a fast scope. You will notice this straight away when you use them in your new Zhumell. Plossl's tend to be underrated for the image quality and eye relief they provide for their relatively low cost. You would not be doing yourself a disservice if you added a couple more to your range, say a 15mm and 4mm. Just look for EPs that are 'fully multi-coated' as they will control internal reflections considerably better so you don't see 'ghost' images on brighter objects.

    Mental.

  4. #4
    Candymancan's Avatar
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    Default

    well there are so many brands at so many costs im not sure really what to buy. Im going to get a Barlow lens from Zhumell. http://www.telescopes.com/telescope-...ssionrings.cfm

    The Meade 4000 Plossels seem to be in my price range, but there all 1.25" EP. Im having a hard time finding any 2" 17-20+ eye peices that arent $300. I can only afford about $50 each.

    http://www.telescopes.com/telescope-...ece125inch.cfm

    Could you guys link me what i should get ?
    Last edited by Candymancan; 06-29-2009 at 12:08 PM.

  5. #5
    RussL's Avatar
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    Default

    Candy, you won't benefit from 2" eyepieces that are any shorter than 26-27mm. The Orion Q70s are around $100 and range from 26-38mm. BTW, Plossls have short eye relief. The Q70s have long eye relief.

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    Candymancan's Avatar
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    Default

    What do you mean by eye relief ?

  7. #7
    star drop's Avatar
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    Eye relief is the distance from the outside lens of the eyepiece to where the image is formed. You eyes pupil must be positioned there in order to see the full field of view produced by the eyepiece. Is is measured in millimeters and a comfortable eye relief for most people is approximately 15mm.

  8. #8
    Lenbo's Avatar
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    Default

    Hi Candymancan. Good luck with the new scope. Ten inches sounds pretty good to me. Just some prespective from someone who is still pretty new at this. I used the 25 and 10 mm eyepieces that came with my scope for awhile before I got anything additional. I don't even have a barlow. I eventually upgraded with a 17mm Hyperian and really like it. Picked it up for around $80.00 used. I've subsequently added a couple more used Hyperions and am happy with them. They work well with my particular scope but I'm also hoping to be able to use these eyepieces if I change or add another scope down the road. Seemed like a pretty good compromise between quality and price for me. I'm glad I didn't run out and spend a lot up front before working with the scope for awhile. Len
    Len
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