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Thread: Becoming friendly with the Leitz Periplan GF eyepieces

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    Default Becoming friendly with the Leitz Periplan GF eyepieces



    Hello all,

    I have added two more Leitz Periplan GF eyepieces to the 12,5x (f=20mm) Leitz Periplan GF 12.5x (f=20mm) Eyepiece ,
    having now a group of three: 10x (f=25mm), 12,5x (f=20mm), and 25x (f=10mm)

    Leitz Periplan GF eyepieces .jpg

    Fields of view:
    The GF 10x has the smallest FOV of 40° in this series, comparable with the FOV of classic orthos.
    The GF 12,5x has the FOV = 48°, hence comparable to the FOV of the Plössls, and slightly less than the Baader BCO orthos.
    The GF 25x has the FOV = 50°, as the Plössls and the Baader BCO orthos.

    The contrast and the sharpness performance of these 3 eyepieces is simply amazing.
    Regarding the tranmissivity of light, the GF 12,5x beats by a margin the Zeiss Diascope eyepiece (f=12.8mm). The transmissivity of the GF 10x and GF 25x is very slightly behind that of the GF 12,5.

    Barlowing and CA:
    The GF 25x (f=10mm) has been barlowed with the Baader Q-Turret triplet Barlow down below the effective f=3.5mm, and tested on the terrestrial targets and on the Moon (26th September), against the Pentax XW 3.5mm eyepiece. The finest resolved details have been comparable, but the contrast of the GF 25x has been significantly higher.
    When barlowed, the GF 25x is free from the blue CA fringe and hue, but the thin red-orange fringe around the bright Moon rim becomes visible. The red-orange fringe can be of course suppressed by the filters.

    So, the Leitz Periplan GF eyepieces seem to keep the high level of the CA correction on the green and blue wavelengths.

    The field curvature of the 6" F/5 achromatic doublet telescope reduces the sharpness of the view in the peripheral area of the field of view, but that's the case with any strictly planar eyepieces.

    Tests equipment:
    Synta Sky-Watcher 6" F/5 achromatic doublet refractor
    Eyepieces for comparison: Pentax XW 10mm and 3.5mm, Swarovski SW 45x f=10.2mm,
    Zeiss Diascope D 30x/40x B WW 12.8mm
    Baader Q-Turret triplet Barlow, with added extension tube

    Best,

    JG
    Last edited by j.gardavsky; 09-28-2017 at 05:27 PM. Reason: typo
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    Default Re: Becoming friendly with the Leitz Periplan GF eyepieces

    The 10x in my F15 Bushnell was clear edge to edge, JG. Is that simply because it is a faster telescope? I also find that I have a very ample focusing range. Which makes it very easy to get a very good Focus on that particular telescope.
    Mark

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    Default Re: Becoming friendly with the Leitz Periplan GF eyepieces

    Hello Mark,

    F/15 is slow, so your Periplan is expected to be sharp edge to edge.
    Best,

    JG
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    Default Re: Becoming friendly with the Leitz Periplan GF eyepieces

    Quote Originally Posted by j.gardavsky View Post
    Hello Mark,

    F/15 is slow, so your Periplan is expected to be sharp edge to edge.
    Best,

    JG
    Thank you J G. I think I meant to say it was a slow telescope but maybe it's me that's slow. :-)
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    Default Re: Becoming friendly with the Leitz Periplan GF eyepieces

    Hello JG
    I noticed in the set of 10x that I now have that the coatings are not the same color. One of them the coating looks cobalt blue on the other one it is a rose color. Can you comment on this. They both seem to work well although I have not pressed them in comparison yet on multiple targets.
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    Default Re: Becoming friendly with the Leitz Periplan GF eyepieces

    Quote Originally Posted by Eagleheaf View Post
    Hello JG
    I noticed in the set of 10x that I now have that the coatings are not the same color. One of them the coating looks cobalt blue on the other one it is a rose color. Can you comment on this. They both seem to work well although I have not pressed them in comparison yet on multiple targets.
    Re: Leitz Periplan GF 10x multicoatings

    Hello Mark,

    the field lens has blue-violet coatings, the eye lens has rosa coatings, followed by lenses with what can be cobalt-blue coatings.
    Should the coatings on the both EPs be different, then they are not paired.
    In practical use, you will not see a difference, my guess.

    Best,

    JG
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    Default Re: Becoming friendly with the Leitz Periplan GF eyepieces

    A very nice acquisition JG! High accolades indeed if the contrast was better than the Pentax. Thank you for the observations.
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    Default Re: Becoming friendly with the Leitz Periplan GF eyepieces

    Hello Ken, hello all,

    here are some technical details on the Periplan concept.

    The optics scheme of the ur-Periplan GF 10x by Leitz (Wetzlar),

    Leitz Periplan optics design.jpg

    shows a field lens (later a cemented doublet), followed by a field stop in the intermediate image plane. The main group with the eye lens provides the CA correction in the blue/violet up to green (430nm - 550nm).
    The Periplan GF series eyepieces have the diameter of 23.2mm, FOV close to 50°, and a short not specified eye relief.

    The later versions of the Leitz Periplan GW and Leitz Periplan GW "glasses" add more lenses, and expand the FOV in the range of 70° up to nearly 74°,

    Periplan Brille.jpg

    The eye piece diameter is 30mm. The "photo" Periplan GW has a thread to mount a digital camera behind the eye lens.

    The both above pictures are from the Leitz user manual, available as a *.pdf:
    "Abbildende und beleuchtende Optik des Mikroskops, Leitz, Wetzlar
    document: 512-99a VI/73/CX/g

    The Leitz Periplan GW design (30mm diameter) is also used by ZEISS (Oberkochen) as "PL Carl Zeiss",

    Zeiss periplan PL 10x.jpg

    The optics scheme shows a field cemented doublet, followed by a field stop in the intermediate image plane. The main triplet group providing the CA correction is cemented, and followed by a single lens and the eye lens.
    The picture is from the ZEISS tutorial ZEISS Microscopy Online Campus | Microscopy Basics | Microscope Optical Systems, section articles/basics/opticalsystems .


    So, the wide field Periplan consists of 7 lenses in 4 groups, a concept often cloned by other manufacturers.

    My preference is towards the old Periplan GF design by Leitz, because it is slim with a minimum of glass materials used. Of course, this does not exclude an option to include the PL Carl Zeiss eyepiece in my arsenal.

    Hoping this helps,

    JG

    PS: Disclaimer - This is a technical info and not a purchase recommendation
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    Default Re: Becoming friendly with the Leitz Periplan GF eyepieces

    Thanks for the update J.G. I have checked a few local surplus medical supply stores and the industrial auction houses here in Montreal and there are quite a few of these eyepieces available. There is a wide range of prices, which I expect is due to condition, but I will have to go see them in person to report back to the forum as to whether Montreal is a gold mine of great deals or a junk pile for eyepieces. If I could indulge myself in a little more "free advice", please let me know if you have any experience with the 8x or 6.3x/6x eyepieces which I calculate would offer 31.75 and 39.6 or 41.6mm focal lengths.

    I would expect a very narrow field due to the barrel size, but the field lens is located right at the end of the barrel and is only restricted by the very narrow retaining ring. The eye lens is larger in the GF models, so I would expect a greater field size difference between the two in these longer focal length models, but as my primary use of these eyepieces would be to gain the ultimate possible throughput and contrast, I would assume that the narrower variants would give me the greatest advantage based on your report of the mid focal length examples. I have included a compiled photo from the catalogues and web sites of items that I have found at the local suppliers to illustrate the differences if you are not familiar with these longer focal length models. Thanks again for these informative postings.
    Leitz Perriplan 6x and 8x eye lenses and field lenses.jpg

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    Default Re: Becoming friendly with the Leitz Periplan GF eyepieces

    Hello Ken,

    the 6.3x at upper left in your pic looks like the latest manufactured by Leitz, the other are possibly vintage items.

    I don't have the 6.3x, as I don't need focus lengths above 25mm.
    When in good condition, and multicoated, then they cost around 150 EUR in Germany.

    As written elsewhere, for me is most important the CA correction in the spectral range 430nm up to around 550nm, and the maximum contrast of the professional grade eyepieces.

    When you'll be checking the microscopes surplus offers, look also for the spectral bandpass interference filters, as found in the accessories of Zeiss, Nikon and Olympus fluorescence microscopes. They can find their use in astronomy as well. Especially the blue interference filters with a bandpass around 20nm are be pretty useful for the resolution enhancement, as the diffraction limit scales with the wavelength.

    Happy hunting, and let me know about your success,

    JG
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