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  1. #1
    Chadfoote's Avatar
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    Default EPs for telescopes I have now and hope to have in the future



    Hello,

    I am fairly new to the hobby, but have already bought two dobsonian telescopes (8" & 12"). I would like to get some nice eyepieces, but I hope to buy a tripod based telescope in a year or two that will be good for photography. If I buy expensive ones now, will i end up needing to buy new ones again when I have a different type of scope? Are nice eyepieces good for all types of telescopes, or are some models better for different types of telescopes?

    If there is a difference, how do I know if the eyepiece is works better with dobsonians?

    Thanks

  2. #2
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    Default

    Most eyepieces are made with a 1 1/4" nose to fit practically every scope.
    There are also 2" eyepieces which fit most of the bigger scopes.
    The 'faster' a scope is the better quality you will need to purchase. If you purchase a cheap EP for a F10 scope, you'll be disappointed by the performance in a F4 scope. (the other way round of course won't be a problem)
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  4. #3
    Chadfoote's Avatar
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    Default

    Thanks! Sounds like I'll be safe buying nicer eyepieces and using them in all scopes until I decide to upgrade to a scope requiring 2" EPs.

  5. #4
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    Yep High End eyepieces work in all telescopes BUT that does not mean they will work well or are even be usable in all telescopes...

    HOWEVER ... a lot depends on the focal length of the telescopes...

    I own 8 and 11 inch scts... slow f/10 scopes but with 2000 an 2800 mm focal lengths... plus I also own a f/6 4 inch refractor with a focal length of 600 mm ..not really a fast scope but the shorter focal length requires much shorter length eyepieces...

    My high powered eyepiece that I use in my 11 inch Sct ( a Pentax XW 10 mm gives me 280x ...but that same eyepiece in the refractor only gives me 60x...so the eyepiece now suddenly becomes a low powered eyepiece but STILL USABLE in both scopes...

    If I were to buy a 5 mm Pentax XW to at least give me 120x in the refractor that 5 mm eyepiece would be completely useless in the Sct as it would give me 560x .... which just ain't gonna work.. So I would have spent over $300 bucks for an eyepiece that is only useable in one of my telescopes...

    So Bottom line you have to consider the focal length of your NEXT telescope when you are thinking of buying your next eyepiece....

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  7. #5
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    Post

    Bob327 hit it right on the head. If you plan on getting a "long focal length" scope in the future like a 2000mm or longer you might buy eyepieces down to 10 or 12 mm for use in it then get a good quality barlow to achieve higher powers in the reflectors. Say eyepieces in the 35 to 12mm range then a 2 or 3x barlow or both. The problem with cheaper eyepieces in the fast scopes f5 or f4 etc is the edge performance(not as sharp), false color and other abberations. You could have a good range with 4 eyepieces and a 2x and 3x barlow. Of course if you buy "high end" eyepieces dont go cheap on the barlows get equally good ones. Just my opinion.
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  9. #6
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    Default

    Quote Originally Posted by Chadfoote View Post
    If I buy expensive ones now, will i end up needing to buy new ones again when I have a different type of scope?
    Probably not;

    I started my Nagler collection in 1989, After finishing the acreation of EPs in the mid 1990s with the 31NT5, I have done nothing to my EP collection until last month where I replaced the 20NT2 with a 21Ethos and the 13NT1 with a 13mm Ethos. The old EPs were still in original condition no scrapes, contusions, scratches, or even dust on the lenses. I have sent them on to new owners in their original cases.

    But to get to the position where an EP collection lasts for dozens of years (to the rest of your lifetime) you need to plan.

    A) You need a really wide FoV EP; and for this everyone likes the 31NT5
    B) you need a series of EPs spaced at 2/3
    C) you need a 2X PowerMate (or barlow)

    So with a starting point of 31mm *2/3 = 20-21mm * 2/3 = 13-14mm * 2/3 = 8-9mm

    Hitting these with a 2X barlow gives you 15.5mm, 10mm, 6.5mm, 4mm. The complete set now looks like: 31mm, 20mm, 15.5mm, 13mm, 10mm, 8mm, 6.5mm, 4mm. With only 4 EPs.

    The 4mm EP will be too high in power for many scopes, but remains useful for collimation purposes.

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