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  1. #1
    rwsandy's Avatar
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    Default eyepieces for 12.5 inch f5 dob



    Since I recently found a used dob (12.5 inch f5 Discovery), I am wondering what eyepieces are being used by owners of similar size scopes.

    At my age, I figure a 6mm exit pupil is about max for me.

    So what is a good selection of eyepieces for this scope?

    (no zooms or barlows, just eyepieces)

    Thanks.
    Fly me to the moon, let me play among the stars -- Sinatra

    Older Discovery 12.5 solid tube dob, Orion 120mm refractor, non-go-to mount, eyepieces are 40mm and 32mm Orion Highlights, 25mm and 10mm Orion stock, 17mm Sterling, 12.5mm Baader, and 7.5mm Orion Ultrascopic, all housed in 8X10 Sky Shed

  2. #2
    Joe Lalumia's Avatar
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    Default

    Hyperions are good, virtually all of the Televues, and the 5000 series Meade's.

    Toss in Pentax eyepieces-- try to find a local Astronomy club and join. The members will let you try out different eyepieces at a star party.
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    TelescopeMan Web Site

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    search for W1XWX to see my amateur radio web site

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  4. #3
    ibase's Avatar
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    Default

    Quote Originally Posted by rwsandy View Post
    Since I recently found a used dob (12.5 inch f5 Discovery)..(no zooms or barlows, just eyepieces)
    But a zoom is an eyepiece too! Just kidding..

    Joe's advice above is a good one, Hyperions are well liked by Dob owners, not as sharp to the edge as you'd like to be in a fast scope, but good enough. Or there's Vixen LVW's which receive very good reviews too. If you want a wider field than the 68-deg of the Hyperions, the Meade UWA series 5000 or the Explore Scientific II 82-deg., are good choices too. Of course there are always the Naglers (since you didn't specify a budget cap), if you want views to be tack sharp to the very edge of the view, or the Pentax XW's. Good luck!

    Best,

    Hernando
    Last edited by ibase; 12-01-2010 at 02:43 AM.

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    Default

    So, not all EP perform well with fast telescopes. Is there a list in the forum with such EP's? The Hyperion's I own aren't very sharp around the edges when used on my Z10. Whats the cause of the distortion?
    Cal
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    Default

    Cheaper EPs will have edge distortion. If you want the best edge correction you'll have to shell out for Panoptics or Pentax XW EPs.

  8. #6
    ibase's Avatar
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    Default

    That's one of the hidden cost of owning a fast Dob, not often mentioned by those recommending them - if you want pinpoint tack sharp stars up to the very edge of the field, you have to invest some serious $$$ in an EP which is designed to handle the very steep light cone of the fast scopes and the Nagler is an example of such an EP (aside from those mentioned above), it works well with scopes as fast as F/4. Cheaper EP's will make a mess of the outer field, but can relatively do well on "slow" scopes like SCTs at F/10. Aside from the compact and light nature of SCT's, getting to work well with a variety of budget-priced EP's is one of its advantage.

    Best,

    Hernando

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    WWPierre's Avatar
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    Default

    I think Harry Siebert makes the best EPs for the price for short scopes.
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    Default

    I have the 19mm and 13mm of these epes. I really like these eps. The have a little edge distortion, but work quite well in my Z10. Great eye relief as well.
    name: Derek

    Various scopes and such.

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    Default

    The FOV is huge with the 36mm that the distortion doesn't bother me. This is definitely good info for those interested in EP's with fast telescopes.
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