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Thread: wide angle and luttle pupil exit

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    Default wide angle and luttle pupil exit



    Hi to everyone,

    Im new in astronomy and I want to replace the plossl classicals 52 degrees eyepieces.

    I want wide fields, so I've seen ES 82 degrees EP's. But sometimes the exit pupil resultant is 1 mm or less, so Is possible to get wide views if your are receiving just a 1 mm of light ? ?

    I have an Orion Dobsonian 8" f/5,9

    Thanks in advance

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    not_Fritz_Argelander's Avatar
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    Default Re: wide angle and luttle pupil exit

    Oh yes, that's not a problem. The exit pupil disk may be only 1mm wide but the cone of light rays feeding it can still be 82 degrees.

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    Default Re: wide angle and luttle pupil exit

    I also have the same scope and almost exclusively use the ES 82s in it. They will perform extremely well for you, even the shorter focal lengths. I have the 6.7mm but not the 4.7mm, to go shorter on those rare occasions than the 6.7mm, I will use a Barlow on the 11mm or the 8.8mm.
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    Default Re: wide angle and luttle pupil exit

    Thanks not_Fritz_Argelander's and Ozman13 for your answers ¡

    Now the questions are, due to I want to move to an Orion Dobson 14" f/4.6 Goto. Im looking the ES 82° eyepieces to buy 3 or 4. I like wide fields.

    1) I´ll get wide views both in 1.25" and 2"?
    2) In case you think ES eyepieces are a good alternative, which ones do you suggest me? The kit comes with 6.7, 11, 18 and 30 mm, with eye reliefs from 15.7 up to 22,
    3) Is the 15.7 mm eye relief comfortable for most people? (I usually invite another people to see)

    Thanks again

    Skyciber

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    Default Re: wide angle and luttle pupil exit

    I had that same Dob but mounted as a push to not go to. It's a good choice. The truss tube actually is easier to wrangle than my 12" Z12 which has a solid tube.

    I'm not interested in go to Dobs. More can go wrong.

    As for eyepieces I'll let others advise. I don't like 82 degree AFOV format. They are a purely personal "sour spot". I prefer less pincushion distortion so I use 70 degree format like TV Panoptic and Delos. When I want to go wide I use ES 100s.
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    Default Re: wide angle and luttle pupil exit

    Going to a 14" Dob is a question only you can answer, but realize, it is a BEHEMOTH compared to the 8" Dob and you will have to consider transporting it and the ergonomics of such a large scope. The best scope is one you will use, and I've read many reports of people who have gotten over their heads with a large scope. I HIGHLY SUGGEST you see one in operation at a star party beforehand if possible. On the other hand, there are several members here who love their 14" Dob because it is a very nice scope.

    The VAST majority (nFA is the only exception who comes to mind, but I'm sure there are at least a few more) of people LOVE the ES 82s as they perform extremely well in ALL scopes. There are two EPs in that line I would not do without (I like them ALL tremendously), the 18mm and 11mm. For a third and fourth I would choose the 14mm and 8.8mm, but the 24mm comes in close and the 30mm might be a better choice than the 24mm if you chose to go with the 14" Dob.

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    Default Re: wide angle and luttle pupil exit

    Quote Originally Posted by Skyciber View Post
    Thanks not_Fritz_Argelander's and Ozman13 for your answers ¡

    Now the questions are, due to I want to move to an Orion Dobson 14" f/4.6 Goto. Im looking the ES 82° eyepieces to buy 3 or 4. I like wide fields.

    1) I´ll get wide views both in 1.25" and 2"?
    2) In case you think ES eyepieces are a good alternative, which ones do you suggest me? The kit comes with 6.7, 11, 18 and 30 mm, with eye reliefs from 15.7 up to 22,
    3) Is the 15.7 mm eye relief comfortable for most people? (I usually invite another people to see)

    Thanks again

    Skyciber
    I have a quite few ES 82 EPs and like them a lot. The only thing I really wish for is the eye relief. It is tight. On some like ES82 18mm it was too short for me. Others I can still use but I never able to see all 82 degrees of FOV because of the short eye relief, so I treat them as good 70 degree EPs .

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    Default Re: wide angle and luttle pupil exit

    Quote Originally Posted by Bigzmey View Post
    I have a quite few ES 82 EPs and like them a lot. The only thing I really wish for is the eye relief. It is tight. On some like ES82 18mm it was too short for me. Others I can still use but I never able to see all 82 degrees of FOV because of the short eye relief, so I treat them as good 70 degree EPs .
    If you want more eye relief, it might be worth looking at the Nagler type 4s - they're designed for longer eye relief. They're expensive new, but I managed to pick up a 17mm and 12mm type 4 secondhand at a good price when the Ethos range came out and people were upgrading. Worth checking the specs, anyway - I'm not sure how they compare, but you might get another 5mm or so.
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    Default Re: wide angle and luttle pupil exit

    Thanks again for your opinions and suggestions.

    I´m deciding for the next eyepieces, let me know your opinion:

    1) 6mm Tele Vue Delos 72° 20 mm eye relief - 1,25"
    2) 10mm Tele Vue Delos 72° 20 mm eye relief - 1,25"
    3) 14mm Tele Vue Delos 72° 20 mm eye relief - 1,25"
    4) 24 mm EXPLORE SCIENTIFIC 82° - 2"
    5) ¿¿ ------ ?? (between 24 & 30)
    6) 30 mm EXPLORE SCIENTIFIC 82° - 2"

    Thanks in advance ¡

    Skyciber

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    Default Re: wide angle and luttle pupil exit

    Quote Originally Posted by Skyciber View Post
    Thanks again for your opinions and suggestions.

    I´m deciding for the next eyepieces, let me know your opinion:

    1) 6mm Tele Vue Delos 72° 20 mm eye relief - 1,25"
    2) 10mm Tele Vue Delos 72° 20 mm eye relief - 1,25"
    3) 14mm Tele Vue Delos 72° 20 mm eye relief - 1,25"
    4) 24 mm EXPLORE SCIENTIFIC 82° - 2"
    5) ¿¿ ------ ?? (between 24 & 30)
    6) 30 mm EXPLORE SCIENTIFIC 82° - 2"

    Thanks in advance ¡

    Skyciber
    That is an excellent list. There would be no need of anything between the ES 24mm and 30mm but I would HIGHLY recommend the ES 18mm 82.
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