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Thread: f=30mm ultrawide 2" eyepiece

  1. #11
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    Default Re: f=30mm ultrawide 2" eyepiece



    Hi JG,

    I hope I am incorrect. I am familiar with Wild Heerbrugg for making very high quality microscopes. I have one exquisite example in my lab. Stunning clear, diffraction limited optics! However the curvature of the focal plane of a microscope and hence the eyepiece is quite different to a telescope and so microscope eyepieces, though they may be good quality, often disappoint when put in telescopes. I picked up a small batch of Leica and Nikon microscope eyepieces that were heading for disposal. They were not even suitable for finderscopes.

    I do hope yours comes from a telescope and has and appropriately curved focal plane. It may be a matter of you matching it with the correct OTA. I would try it in some friends OTA's first and find where it works best.

    I hope this works for you.

    Joe
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    Default Re: f=30mm ultrawide 2" eyepiece

    Quote Originally Posted by jaetea View Post
    Hi JG,
    If you can get your hands on an Explore Scientific 30mm 82° AFOV EP, I would love to see you do a comparison between those two eyepieces.
    Cheers,
    JT
    That ES weighs about 10 ounces more than yours JG but I too wonder how they compare optically.

    Have fun with your new toy

    Abb
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  4. #13
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    Default Re: f=30mm ultrawide 2" eyepiece

    Quote Originally Posted by ozeclipse View Post
    Hi JG,

    I hope I am incorrect. I am familiar with Wild Heerbrugg for making very high quality microscopes. I have one exquisite example in my lab. Stunning clear, diffraction limited optics! However the curvature of the focal plane of a microscope and hence the eyepiece is quite different to a telescope and so microscope eyepieces, though they may be good quality, often disappoint when put in telescopes. I picked up a small batch of Leica and Nikon microscope eyepieces that were heading for disposal. They were not even suitable for finderscopes.

    I do hope yours comes from a telescope and has and appropriately curved focal plane. It may be a matter of you matching it with the correct OTA. I would try it in some friends OTA's first and find where it works best.

    I hope this works for you.

    Joe
    Hello Joe,

    and thank you for the comments.

    the microscope eyepieces like Zeiss Pl, Leitz Periplan, Leica Plan, Leica Plan S, Leica L, are corrected strictly for the "infinity", and at the short focus length (well below f=25mm), they are not suited for the fast scopes, unless I take a field flattening Barlow.
    At f=25mm, I can't see the drop of sharpness towards the edge of the AFOV, and a similar experience has been reported in https://www.cloudynights.com/topic/5...escopes/page-2 , when reporting on the f=25mm Zeiss Pl microscope eyepieces on the fast telescopes.
    See also:
    Carl Zeiss E-Pl 10x/20 #44 42 31 aspheric eyepiece
    Sh2-134 and Sh2-135 in Cepheus, and a Zeiss E-Pl / Leica HC PLAN S shootout


    An exception may be the Leitz Periplan GF eyepieces which are so brutal sharp that they reveal a drop towards the edge of the AFOV, but they show the Cassini division even at the low magnifications at a very high contrast, in fact better than the other eyepieces in my arsenal. But these Leitz's have been extra designed for the highest resolution on the blue wavelengths.

    Wild Heerbrugg microscopes are more widespread in the English speaking world than in Germany, so this eyepiece is my first encounter with Wild.
    The latest series of the Wild microscope eyepieces have been after the fusion with Leica Microsystems outsourced to manufacturing in China. But pairs of the original Wilds are still available https://www.ebay.at/itm/Wild-Heerbru...kAAOSwVHdarp8d

    Similarly to Leitz/Leica, Wild has also designed and manufactured the 'geometry' systems for triangulation, and the military optics for the Swiss Army. So, this eyepiece has been highly likely used in a gun telescope for aiming, the reticle not necessary for astronomy, has been removed.
    The optics design of this eyepiece has nothing to do with the designs of the microscopy eyepieces.

    Best,

    JG
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  5. #14
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    Default Re: f=30mm ultrawide 2" eyepiece

    Quote Originally Posted by AbbN View Post
    That ES weighs about 10 ounces more than yours JG but I too wonder how they compare optically.

    Have fun with your new toy

    Abb
    Hello Abb,

    before any tests, my feeling would say that they won't show any substantial difference on the 110 Messiers.
    Going deeper to the Sharpless nebula not included in the NGC/IC catalogs, I would expect some differences in performance, as the other eyepieces in my arsenal reveal differences as well.

    I am also very curious to try the first stars light through this Wild eyepiece.

    Thank you for your comments,

    JG
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    Default Re: f=30mm ultrawide 2" eyepiece

    First stars through the Wild (Heerbrugg) 30mm ultrawide

    Hello all,

    Yesterday night has been the first opportunity to try out this eyepiece on my 6” F/5 Synta (Sky-Watcher) achromatic refractor under the night skies.

    The first target has been the Alpha Persei Moving Group (Mel 20), to see how the Wild performs on the bright stars. The eyepiece is very comfortable to bring into the exact focus, and the stars are within more than 80% of the FOV
    pin point sharp, nearly hurting my eyesight. The last 5% towards the edge show field aberrations,
    but no “ring of fire”.

    The Double Cluster becomes in the ultrawide field at the magnification of 25x nicely framed.
    I have been surprised to find the red giants between and around the both clusters, which are often difficult even under better skies through the 25x100 binoculars.

    The Dumbbell Nebula M27 has offered its cork, and the Ring Nebula M57 its bright disk – even if small at this magnification. This has been again surprising, as the waxing gibbous Moon interfered.

    So, this eyepiece seems to offer a very high contrast and a very good transmissivity of light.

    Best,

    JG
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    Default Re: f=30mm ultrawide 2" eyepiece

    Congratulations on a successful test of the new toy!
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    Default Re: f=30mm ultrawide 2" eyepiece

    Hello JG. It would appear from your tests, that this new eyepiece is a real "keeper", with it's high contrast and light transfer. Thanks for your report JG, and the best of wishes for many clear skies.
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    Default Re: f=30mm ultrawide 2" eyepiece

    Hello Marshall,

    this Wild is certainly better than the 32mm aspheric wide EP I used to have, and which has not been bad at all.

    In the above report, I have forgotten to mention the M31 with its M32 and M110 clearly seen, and a very faint outer spiral arm between the M31 core and the M110.
    I often forget something, ha, ha, but the primary use for this EP will be the large nebulae, and the stars associations.

    Thank you for your kind comments,

    JG
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