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Thread: Leica Eyepieces: B 20x WW, B 32x WW, and 25x - 50x WW 80° ASPH.

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    Default Leica Eyepieces: B 20x WW, B 32x WW, and 25x - 50x WW 80° ASPH.



    Hello all,

    on Friday, I have received the last B 32x WW eyepiece to complete the small Leica set.
    The B 20x WW and the B 32x WW eyepieces have been designed and manufactured for the older and now discontinued Leica achromatic and APO spotting refractors.
    The Leica ultrawide (up to 80°) aspheric zoom 25x-50x came into my arsenal together with the new Leica APO Televid 82mm spotting refractor.

    Now, this little completed set makes a row

    Leica eyepieces.jpg

    The intended use:
    The B 20x WW and B 32x WW will be used on the 6” F/5 Synta (Sky-Watcher) achromatic refractor,

    Leica EP on the focuser.jpg

    and the Zoom will spend most of its life on the Leica APO Televid, even if I have an adapter to 1.25” to use it on the Synta.

    Technical specifications:

    Leica B 32x WW item # 41004
    f= 14mm, FOV = 73°
    eye relief up to 20mm
    length 68mm, diameter 54mm
    weight 288g
    optics design: 7 lenses
    bayonet: Leica Televid 77mm and 62mm series

    Leica B 20x WW item # 41002
    f= 22mm, FOV = 69°
    eye relief up to 20mm
    length 65mm, diameter 53mm
    weight 246g
    optics design: 6 lenses
    bayonet: Leica Televid 77mm and 62mm series

    Leica Zoom 25x -50x WW Asph. item # 41019
    f= 18mm – 9mm, FOV = 59° - 80°
    eye relief up to 19mm
    length 100mm, diameter 57.5mm
    weight 390g
    optics design: 8 lenses
    bayonet: Leica APO Televid 82mm

    Bayonet-to-1.25” and 2” adapters availability: APM, third parties

    Multicoatings and the built quality

    These three eyepieces are very solidly built, the outer lenses surfaces reveal amber multicoatings.
    The inner reflections on the lens surfaces are suppressed, the laser beam ‘impact’ spots don’t diffuse, indicating a very high polishing quality of the lens surfaces.

    The optics scheme as inspected with the green laser beam:

    B 20x WW: The eye lens is a plan-convex singlet with a minimum of the green laser beam scatter in the lens material. The next lens inside is a cemented doublet.
    The field lens is a cemented doublet.
    B 32x WW: The eye lens is an asymmetric biconvex singlet with a medium of the green laser beam scatter in the lens material. The next lens inside is a cemented triplet.
    The field lens is an air-spaced doublet. The first lens in this doublet might be a synthetic fluoride glass, as the green laser beam does not reveal any scatter. The 'warmer' teint on the field lens outer surface may also support its being made from the fluoride glass.

    The properties of the lens behind the field stop have not been recognizable with certainty, even if this lens must be there.

    All in all, my impression is, that here we have the “Leitz Periplan design” adapted for the fast refractors.

    First light, and reports:

    B 32x WW on the 6” F/5 Synta (Sky-Watcher) achromatic refractor,
    magnification 53x, exit pupil 2.8mm:
    The terrestrial object for the first light has been a village down in the valley, before the rain has stopped the test. Even if cloudy, the eyepiece has offered a very high contrast view with a mass of sharply resolved smallest details. 85% up to 90% of the field of view have been very sharp, the performance towards the edge of the field still acceptable.
    The terrestrial tests, and the tests on the deep sky objects will continue, as soon as the weather permits.

    B 20x WW on the 6” F/5 Synta (Sky-Watcher) achromatic refractor,
    magnification 34x, exit pupil 4.4mm:
    A test on the Crescent and Tulip nebulae in Cygnus is here: The Tulip Sh2-101 and the Crescent nebula NGC 6888 on 19th August 2017

    25x – 50x WW ASPH. on the 82mm Leica APO Televid:
    A report on the Sharpless nebulae of the winter/spring season is here: Sh2-280, Sh2-282, Sh2-284, and Sh2-311 nebulae in March 2017


    Thanks for reading,

    JG
    Binoculars: Leica Ultravid 7x42, 8x42HD; Swarovski EL 8.5x42 Swarovision; Nikon 10x70 Astroluxe; Docter Nobilem 7x50 Porro; Jenoptem 7x50W, 10x50W; BA8: 10.5x70, 15x85; 25x100FB, AsahiPentax 8x40, Refractors: Sky-Watcher 150mm/750mm; Leica APO Televid 82mm (25x-50x WW ASPH); EPs:Baader Classic Orthos; Fujiyama ortho, Leica B WW, ultrawide zoom ASPH, Periplan GF, HC Plan S, L; DOCTER UWA; Wild UW mil; Tele Vue Delos, Nagler Zoom, Plössls; Swarovski SW; Pentax XW; ZEISS diascope B WW T*, Carl Zeiss E-Pl; Hensoldt mil; Filters: Astrodon, Astronomik, Baader (CCD), TS; Astrophotography: AstroTrac; Leica R7: Leica 2/50, 2/90mm, 2.8/180mm lenses
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    Default Re: Leica Eyepieces: B 20x WW, B 32x WW, and 25x - 50x WW 80° ASPH.

    Thanks for this posting. Now I'm curious if you find specific optical merits to chose between the Leicas or Periplans in the Skywatcher depending on the targets, or does one consistently outperform the other? I assume that the GF's would be closer to the Leicas in field size, so perhaps the standard field Periplans would offer a slight contrast advantage?
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    102mm achro.
    EP's: WO 40mm SWAN, 20, 9mm, 3.5mm XWA; ES 14mm 100°; Meade 5mm MWA; Gary Russell Konigs and zoom, TMB 2.5mm, 3.2mm, 4mm Planetaries; TV 1.8x 2.5x Barlows; Some older Plossls and Orthos
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    Default Re: Leica Eyepieces: B 20x WW, B 32x WW, and 25x - 50x WW 80° ASPH.

    Always good to read. Nice glass. Congratulations!
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    Default Re: Leica Eyepieces: B 20x WW, B 32x WW, and 25x - 50x WW 80° ASPH.

    Hello Ken,

    the both Leicas B WW series are wide field eyepieces, even if their optics scheme may have roots in the Periplan design.
    The Periplans have the FOV close to 50°.
    The both are not suited for the short focus lengths, but the Periplans can be barlowed, and they might be better barlowed than the Baader BCO orthos, as the tests have revealed.
    With less glass inside, I bet the Periplans will offer a contrast and maybe a transmissivity advantage, as you are concluding, Ken.

    So, I have basically purchased with the Leica B WW eyepieces more FOV and more observing comfort.
    Without having had a chance to collected the the both Leica B WW eyepieces over about 1 year, I would have been still happy with the Swarovski and Zeiss eyepieces.

    It may sound as herding redundancy, as on most DSOs the performance of the Leica-Swarovski-Zeiss eyepieces is pretty close. However, some nebulae, or details inside, are the differentiators, where one of the three makes wins.

    Now, I promise, I won't add more eyepieces to my arsenal, no more place in the drawer, believe me please,

    JG
    Binoculars: Leica Ultravid 7x42, 8x42HD; Swarovski EL 8.5x42 Swarovision; Nikon 10x70 Astroluxe; Docter Nobilem 7x50 Porro; Jenoptem 7x50W, 10x50W; BA8: 10.5x70, 15x85; 25x100FB, AsahiPentax 8x40, Refractors: Sky-Watcher 150mm/750mm; Leica APO Televid 82mm (25x-50x WW ASPH); EPs:Baader Classic Orthos; Fujiyama ortho, Leica B WW, ultrawide zoom ASPH, Periplan GF, HC Plan S, L; DOCTER UWA; Wild UW mil; Tele Vue Delos, Nagler Zoom, Plössls; Swarovski SW; Pentax XW; ZEISS diascope B WW T*, Carl Zeiss E-Pl; Hensoldt mil; Filters: Astrodon, Astronomik, Baader (CCD), TS; Astrophotography: AstroTrac; Leica R7: Leica 2/50, 2/90mm, 2.8/180mm lenses
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    Default Re: Leica Eyepieces: B 20x WW, B 32x WW, and 25x - 50x WW 80° ASPH.

    One drawer is not enough!

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    Default Re: Leica Eyepieces: B 20x WW, B 32x WW, and 25x - 50x WW 80° ASPH.

    Thanks for these details. I will soon be getting some Periplans, so I will let you know how they perform compared to my Russell Konigs which are currently my best eyepieces for throughput and contrast. I did some more reading and realized that the Periplan GF's did not have as large an AFOV as I had initially thought. If you buy a set of 100 degree eyepieces, they are so large that you will only need a few of them to fill your drawer.
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    Default Re: Leica Eyepieces: B 20x WW, B 32x WW, and 25x - 50x WW 80° ASPH.

    Hello Ken,

    I am still hesitating with the Leitz Periplan 8x, I'd like to have a pair for the Zeiss Stemi stereo microsope to replace the Zeiss EPs.
    Your shootout of the Periplan against the other eyepieces will be very interesting!
    At the moment, I can do just nothing. Yesterday it has stopped raining, and today it has started snowing.
    Best,

    JG

    PS: I won't go for the 100° EPs, whatever nice and great they certainly are
    Binoculars: Leica Ultravid 7x42, 8x42HD; Swarovski EL 8.5x42 Swarovision; Nikon 10x70 Astroluxe; Docter Nobilem 7x50 Porro; Jenoptem 7x50W, 10x50W; BA8: 10.5x70, 15x85; 25x100FB, AsahiPentax 8x40, Refractors: Sky-Watcher 150mm/750mm; Leica APO Televid 82mm (25x-50x WW ASPH); EPs:Baader Classic Orthos; Fujiyama ortho, Leica B WW, ultrawide zoom ASPH, Periplan GF, HC Plan S, L; DOCTER UWA; Wild UW mil; Tele Vue Delos, Nagler Zoom, Plössls; Swarovski SW; Pentax XW; ZEISS diascope B WW T*, Carl Zeiss E-Pl; Hensoldt mil; Filters: Astrodon, Astronomik, Baader (CCD), TS; Astrophotography: AstroTrac; Leica R7: Leica 2/50, 2/90mm, 2.8/180mm lenses
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    Default Re: Leica Eyepieces: B 20x WW, B 32x WW, and 25x - 50x WW 80° ASPH.

    Quote Originally Posted by j.gardavsky View Post
    PS: I won't go for the 100° EPs, whatever nice and great they certainly are
    I don't expect you would. I only "go for them" as a gimmicky toy, not for serious observing.
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    Default Re: Leica Eyepieces: B 20x WW, B 32x WW, and 25x - 50x WW 80° ASPH.

    Quote Originally Posted by not_Fritz_Argelander View Post
    I don't expect you would. I only "go for them" as a gimmicky toy, not for serious observing.
    Hello not_Fritz,

    I have learned from you that one can live pretty well with 50° FOV and even with less.
    Regarding Leitz/Leica, ich habe eine Macke (I have a quirk): once in life Leitz/Leica, then forever Leitz/Leica.
    Best,

    JG
    Binoculars: Leica Ultravid 7x42, 8x42HD; Swarovski EL 8.5x42 Swarovision; Nikon 10x70 Astroluxe; Docter Nobilem 7x50 Porro; Jenoptem 7x50W, 10x50W; BA8: 10.5x70, 15x85; 25x100FB, AsahiPentax 8x40, Refractors: Sky-Watcher 150mm/750mm; Leica APO Televid 82mm (25x-50x WW ASPH); EPs:Baader Classic Orthos; Fujiyama ortho, Leica B WW, ultrawide zoom ASPH, Periplan GF, HC Plan S, L; DOCTER UWA; Wild UW mil; Tele Vue Delos, Nagler Zoom, Plössls; Swarovski SW; Pentax XW; ZEISS diascope B WW T*, Carl Zeiss E-Pl; Hensoldt mil; Filters: Astrodon, Astronomik, Baader (CCD), TS; Astrophotography: AstroTrac; Leica R7: Leica 2/50, 2/90mm, 2.8/180mm lenses
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    Default Re: Leica Eyepieces: B 20x WW, B 32x WW, and 25x - 50x WW 80° ASPH.

    Quote Originally Posted by not_Fritz_Argelander View Post
    I don't expect you would. I only "go for them" as a gimmicky toy, not for serious observing.
    Noooooooooooooooooooo!!!!!!!!!!!!!!!!!, it's the 120 degree eyepieces that are the gimmicky toys, the 100 degree models are absolute necessities. I can't see the field stop in my one 110 degree model, so I guess I'll have to put it on the gimmicky toy list as well, but it is nice to have an "endless" field at a very high magnification. I propose a new category of "Sorta gimmicky, but so much fun ya gotta have one".

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    102mm achro.
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