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  1. #1
    Bobble's Avatar
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    Default And my next eyepiece is....



    After using my Bader Hyperion 21mm eyepiece I decided to purchase the 8 mm Hyperion as my second EP. I was thoughly satisfied with the 21mm with its 62 degree FOV (advertised as 68 degree FOV).
    I decided on the 8mm for several reasons:
    #1. As suggested by members on this forum
    a) Don't rush out a buy what you think you need. Only after
    using the EP's at hand for a bit you will come to find what
    Apertura AD12, ES ED127 Apo, Celestron C8, ES AR102, HEQ5 Mount, Coronado PST.
    ES EPs- 100* 9 & 14mm, 82* 4.7 , 6.7, 18, 24, 30mm, Baader 21 & 8-24mm zoom, 2" Lunt Hershel Wedge .
    Canon EOS T3I, ATIK Infinity Colour, Mallincam Jr. Pro PC, DMK21, Neximage5,

    Who are we? We find that we live on an insignificant planet of a humdrum star lost in a galaxy tucked away in some forgotten corner of a universe in which there are far more galaxies than people. Carl Sagan

  2. #2
    kencrowder's Avatar
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    Default

    That sounds like a good choice. Next you might think about something in between with a Barlow or a longer fl for a wide FOV and a Barlow to give something in between.

  3. #3
    Bobble's Avatar
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    Default Messed up.. to continue...

    Quote Originally Posted by Bobble View Post
    After using my Bader Hyperion 21mm eyepiece I decided to purchase the 8 mm Hyperion as my second EP. I was thoughly satisfied with the 21mm with its 62 degree FOV (advertised as 68 degree FOV).
    I decided on the 8mm for several reasons:
    #1. As suggested by members on this forum
    a) Don't rush out a buy what you think you need. Only after
    using the EP's at hand for a bit you will come to find what
    to continue...you really need
    b) Choose an EP with a mag no higher than the f#
    of your scope ( my f8 scope = 8mm).
    c) Read the stickies on eyepieces and any questions,
    comments or concerns you my have just ask the
    members. They are more than happy to assist.
    Apertura AD12, ES ED127 Apo, Celestron C8, ES AR102, HEQ5 Mount, Coronado PST.
    ES EPs- 100* 9 & 14mm, 82* 4.7 , 6.7, 18, 24, 30mm, Baader 21 & 8-24mm zoom, 2" Lunt Hershel Wedge .
    Canon EOS T3I, ATIK Infinity Colour, Mallincam Jr. Pro PC, DMK21, Neximage5,

    Who are we? We find that we live on an insignificant planet of a humdrum star lost in a galaxy tucked away in some forgotten corner of a universe in which there are far more galaxies than people. Carl Sagan

  4. #4
    HarryBnBad's Avatar
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    Default

    I might be new at this, but I've been looking into a barlow, and seems like if and when I get one, I'm really going to look hard at the tv powermates. The 2.5x really looks nice. A bit pricey, but, from what other have said, well worth it...

  5. #5
    Bobble's Avatar
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    Default Now to the real questions

    When you remove the barlow portion of a Bader Hyperion 21mm EP
    you have then a 2 inch Erfle 32mm EP.
    I have read that the erfle EP is not a favorite of amature astronomers. Can anyone shed any light on that view?
    Also is there anyway I use the 2 inch 32mm somehow
    in my 1.25 inch focuser? A 2" to 1.25" reducer?
    If this was possible then I would have with my new 8mm
    purchase and my existing 21mm EP- 8mm, 21mm (1.25") 22mm and 32mm (2").
    It would be real nice to have use of that 32mm.
    Apertura AD12, ES ED127 Apo, Celestron C8, ES AR102, HEQ5 Mount, Coronado PST.
    ES EPs- 100* 9 & 14mm, 82* 4.7 , 6.7, 18, 24, 30mm, Baader 21 & 8-24mm zoom, 2" Lunt Hershel Wedge .
    Canon EOS T3I, ATIK Infinity Colour, Mallincam Jr. Pro PC, DMK21, Neximage5,

    Who are we? We find that we live on an insignificant planet of a humdrum star lost in a galaxy tucked away in some forgotten corner of a universe in which there are far more galaxies than people. Carl Sagan

  6. #6
    Bobble's Avatar
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    Default

    Quote Originally Posted by HarryBnBad View Post
    I might be new at this, but I've been looking into a barlow, and seems like if and when I get one, I'm really going to look hard at the tv powermates. The 2.5x really looks nice. A bit pricey, but, from what other have said, well worth it...
    I have inquired into the TV Powermates and have heard nothing but the best of them.
    I seen this piece at the shop and for me it would extend too far out from my scope. Plays hell on the balance too I suspect.
    Apertura AD12, ES ED127 Apo, Celestron C8, ES AR102, HEQ5 Mount, Coronado PST.
    ES EPs- 100* 9 & 14mm, 82* 4.7 , 6.7, 18, 24, 30mm, Baader 21 & 8-24mm zoom, 2" Lunt Hershel Wedge .
    Canon EOS T3I, ATIK Infinity Colour, Mallincam Jr. Pro PC, DMK21, Neximage5,

    Who are we? We find that we live on an insignificant planet of a humdrum star lost in a galaxy tucked away in some forgotten corner of a universe in which there are far more galaxies than people. Carl Sagan

  7. #7
    Diagoras's Avatar
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    Default

    Quote Originally Posted by Bobble View Post
    After using my Bader Hyperion 21mm eyepiece I decided to purchase the 8 mm Hyperion as my second EP. I was thoughly satisfied with the 21mm with its 62 degree FOV (advertised as 68 degree FOV).
    Wait, I thought that the 21mm was specifically advertised as 65 degrees, not 68.

    ???

  8. #8
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    Default

    Quote Originally Posted by Bobble View Post
    When you remove the barlow portion of a Bader Hyperion 21mm EP you have then a 2 inch Erfle 32mm EP.

    I have read that the erfle EP is not a favorite of amature astronomers. Can anyone shed any light on that view?
    Back when I was young, the only choices for 65dFoV were Erfles and König eyepieces. The Televue WideFields were, in effect, Erfles. The Panoptics are relatives of the Erfle design.

    The reason Erfles are not so dear to our hearts is the the scope they were used in changed. An Erfle is fairly well corrected for slow optical systems (refractors and SCTs) and starts loosing it at F/6. Since Big DOBs have sort of taken over the top end, an EP suitable for faster optical systems was required.

    Modern optical calculation (simulation) engines have made the exploration for EP designs considerably easier. The plethora of new kinds of glass has not. The combination of moer kinds of glass, and better tools has lead to the superb modern designs we crave (even if we cannot afford them). So, its not so much that we disliked them in their heyday, its that their day has come and gone.

  9. #9
    Bobble's Avatar
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    Default

    Quote Originally Posted by Diagoras View Post
    Wait, I thought that the 21mm was specifically advertised as 65 degrees, not 68.

    ???
    Diagoras
    Your are right .
    I stand corrected.
    Thanks
    Bob
    Apertura AD12, ES ED127 Apo, Celestron C8, ES AR102, HEQ5 Mount, Coronado PST.
    ES EPs- 100* 9 & 14mm, 82* 4.7 , 6.7, 18, 24, 30mm, Baader 21 & 8-24mm zoom, 2" Lunt Hershel Wedge .
    Canon EOS T3I, ATIK Infinity Colour, Mallincam Jr. Pro PC, DMK21, Neximage5,

    Who are we? We find that we live on an insignificant planet of a humdrum star lost in a galaxy tucked away in some forgotten corner of a universe in which there are far more galaxies than people. Carl Sagan

  10. #10
    Bobble's Avatar
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    Default

    Quote Originally Posted by MitchAlsup View Post
    Back when I was young, the only choices for 65dFoV were Erfles and König eyepieces. The Televue WideFields were, in effect, Erfles. The Panoptics are relatives of the Erfle design.

    The reason Erfles are not so dear to our hearts is the the scope they were used in changed. An Erfle is fairly well corrected for slow optical systems (refractors and SCTs) and starts loosing it at F/6. Since Big DOBs have sort of taken over the top end, an EP suitable for faster optical systems was required.

    Modern optical calculation (simulation) engines have made the exploration for EP designs considerably easier. The plethora of new kinds of glass has not. The combination of moer kinds of glass, and better tools has lead to the superb modern designs we crave (even if we cannot afford them). So, its not so much that we disliked them in their heyday, its that their day has come and gone.
    Oh..now I understand.
    Thanks for not using too many big words*L*
    But to clarify "their day has come and gone"refers to the newer,
    faster scopes available nowadays? (f6 and under?)
    They still should be alright for f6+ shouldn't they?
    Regards
    Bob
    Apertura AD12, ES ED127 Apo, Celestron C8, ES AR102, HEQ5 Mount, Coronado PST.
    ES EPs- 100* 9 & 14mm, 82* 4.7 , 6.7, 18, 24, 30mm, Baader 21 & 8-24mm zoom, 2" Lunt Hershel Wedge .
    Canon EOS T3I, ATIK Infinity Colour, Mallincam Jr. Pro PC, DMK21, Neximage5,

    Who are we? We find that we live on an insignificant planet of a humdrum star lost in a galaxy tucked away in some forgotten corner of a universe in which there are far more galaxies than people. Carl Sagan

 

 

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