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  1. #11
    8HHaggis's Avatar
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    Quote Originally Posted by MitchAlsup View Post
    Several This special Barlow is called a Smyth lens.
    Yes.

    See:
    A Chronological History of Smyth & Barlow Lenses

    Steve W/8HHaggis

  2. #12
    Admiral Kirk's Avatar
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    What is your price range? If price is not an object the Radians, Delos or Pentax eyepieces are top of the line. They all have 20mm of eye relief. There are so many choices but don't forget to consider used equipment.

    I got 80% of my eyepieces used on ebay or astromart. Saved about $1000 on just eyepieces not to mention the $2400 i saved on OTA's.

    Decide what you can afford and also what sizes you need for the scope you have. You can probably get by with 3 good eyepieces and one barlow or powermate.

    Not knowing your scope's focal length and aperture limits any further advice.
    C11/IoptronMiniTowerPro; TeleVue 102/Skywatcher AZ4; Celestron Comet Catcher; TeleVue 3mm&18mm Radians, 8mm Ethos, 12mm T4 Nagler, 35mm Panoptic, 2x & 2.5x Powermate, 2" Bandmate Nebustar UHC, Sol Searcher, Quik Point; Meade 25mm plossl & 56mm Super Plossl; Thousand Oaks 2+ Solar Filter 6" and H-Alpha filter 4"; Celestron Skymaster 9x63mm binocs.

  3. #13
    Vondragonnoggin's Avatar
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    Smart Astronomy sells some very decent performing long eye relief eyepieces (LER) that give a 55 degree AFOV and 20mm eye relief with a nice fit and finish. They are relatively inexpensive, but offer great value. There is also the Meade HD60 eyepieces for about $79 each with 60 degree field and 20mm eye relief. All great for eyeglass wearing.
    "To confine our attention to terrestrial matters would be to limit the human spirit."
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  4. #14
    Zeiss's Avatar
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    If you have the cash, Delos or Pentax.
    Cant go wrong with either of them.
    15 inch Obsession
    Low Power: ES 28mm ~60x @1.1░ : Televue Delos 17.3mm ~100x @.72░
    Medium Power: ES 14mm ~122x @.82░ : Televue Delos 10mm ~170x @.42░
    High Power: Televue Delos 6mm ~285x @.25░ : ES 4.7mm ~365x @.22░

  5. #15
    Vondragonnoggin's Avatar
    Vondragonnoggin is offline Bright Giants
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    Quote Originally Posted by Astrodon View Post
    I might also look at the Owl Enhanced Superwide eyepieces, the 6 and 9mm have 17mm eye relief and a decently corrected 66 degree field, even at the f/ratio of your Zhummel 10". I wouldn't recommend the 15mm as it has shorter eye relief and the 20mm as its edge correction is not as good as the others.

    These are very good for the money. They are the same eyepiece as the Orion Expanse line. Agena Astro also sells these EWA series.

    FWIW - using a standard Barlow with a longer fl eyepiece will double the magnification and increase eye relief slightly. It also usually helps eyepieces with soft edges to clean up the edge distortions a bit.
    "To confine our attention to terrestrial matters would be to limit the human spirit."
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  6. #16
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    Delos 6mm it has 20mm eye relief..

  7. #17
    Vondragonnoggin's Avatar
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    Quote Originally Posted by kramedt View Post
    Thanks. I was looking at those (along with the Zhummel Z series and the Pro-optic long relief....all of which are basically the same design). That leads me to this question: My understanding is that eye relief is measured based upon how close you have to be to see the entire field of view. So moving my eye back, I can still use the eyepiece I just can't see to the field stop. So is it the case that if I move my eye back 30% further that my field of view would be reduced by the same 30%? Because if that is the case my 82 degree ES eyepiece would give about a 57 degree FOV at 20mm. So these 20mm 55 degree eyepieces wouldn't really give me any benefit over what I already have. Or is that incorrect?
    There is a huge difference between moving your eye back for a vignetted view and actually having an eyepiece designed for long eye relief. I have both 82 degree eyepieces and all the way down to 45 degree eyepieces and there is no comparison. If you feel you absolutely must have Superwides and long eye relief, then buy the Delos with 72 degree AFOV and 20mm eye relief. I would take the 55 degree LER's any day over anything that gave me a vignetted view in the eyepiece. Just a my take on it.

    I normally get long focal length eyepieces and use a Telecentric power amplifier like a Powermate or TeleXtender to bring up the magnification and keep the long eye relief the same of the lower power eyepiece.

    Most people that wear glasses for astigmatism, do not use the glasses at high powers. Just low powers. That's my own personal experience too. I still like long ER even without my glasses on.
    "To confine our attention to terrestrial matters would be to limit the human spirit."
    Stephen Hawking

    A varied hodgepodge of observing gear,

    Skunks that sniff my feet while observing...

 

 
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