Results 1 to 9 of 9
Like Tree25Likes
  • 7 Post By j.gardavsky
  • 3 Post By Gabby76
  • 3 Post By bladekeeper
  • 1 Post By Brodavid1953
  • 2 Post By not_Fritz_Argelander
  • 1 Post By Trombatissimo
  • 2 Post By j.gardavsky
  • 5 Post By j.gardavsky
  • 1 Post By Brodavid1953

Thread: Leitz Periplan GF 12.5x (f=20mm) Eyepiece

  1. #1
    j.gardavsky's Avatar
    j.gardavsky is offline Super Moderator
    Points: 111,211, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 23.0%
    Achievements:
    Ghost Achievement! Averaging 5+ posts a day!200+ Posts Achievement!400+ Posts AchievementFirst 1000 Experience Points365 Days+ Registered Achievement!
    Join Date
    Feb 2011
    Location
    Germany
    Posts
    14,415
    Points
    111,211
    Level
    100
    Thanks
    14,417
    Thanked 8,797x 5,725 Posts

    Default Leitz Periplan GF 12.5x (f=20mm) Eyepiece



    Hello all,

    this Leitz Periplan GF 12.5x eyepiece is specified as the ‘planar’, f= 20mm (250/12.5 = 20), and with the apparent field of view of 48°. Applicable both for the NPL Fluotar, and for the not apochromatic objectives, with the plane matching, as listed by the manufacturer.
    Barell diameter: 25 mm (0.965”)
    Length: 51.5 mm
    Weight: 49.5 g
    Dioptric correction: on matched eyepiece pairs for binoviewers
    GF: grand field
    /18M: used for selection of the microscope objectives

    Leitz Periplan GF 12,5x front and rear.jpg

    The Leitz Periplan GF 12.5x eyepiece has been designed and manufactured in Wetzlar (Germany) to compensate the chromatic aberration on the green and blue wavelengths down to the UV (as far as transmitted), as required for the fluorescence microscopy. It has been also designed and optimized for the maximum contrast and resolution on the blue wavelengths, as the resolution limits scale with the wavelength of light.

    As the chromatic aberration is a general problem with the refractors, the question arises to which extent the Leitz Periplan design will be applicable to the astronomy refractors.

    The field air-spaced doublet in the eyepiece generates an intermediate image across the plane of the field stop.
    The image is further processed by the eye lens group consisting of a single lens, followed immediately at the smallest distance by another doublet. The last lens surface in the doublet is concave towards the observing eye.
    The eye lens group allows for a precise dioptric focusing on the field stop, as important for the glass wearers.
    The lens surfaces have amber multicoatings with suppressed reflections of the laser beam.

    Tests with the green laser beam
    The laser beam shows minimal reflections on all air-to-lens surfaces.
    The brightness of the laser trace through the field doublet is just slightly less then what we are used to see on the air-spaced doublets in high grade eyepieces.
    The situation changes more dramatically in the eye lens group, where the middle lens leaves a hardly visible trace, similarly to the calcium fluorite optical materials.

    So, this very slim design makes also use of the high grade Leitz proprietary optics technologies.

    Tests on the terrestrial targets
    The Leitz Periplan has been tested with the Synta 6” F/5 achromatic refractor on my ‘standard’ terrestrial target
    (chimney test) about 60 meters away, magnification 37.5x, exit pupil at the eyepiece 4mm
    The bright view reveals a very high contrast and a very high resolution of the finest textures (surface roughness, skretches) on the metal parts of the chimney selected for the tests.
    The CA in the white light is practically not noticeable, when the observing eye is aligned with the eyepiece axis. Otherwise, thin and faint lateral color blue or yellow/green fringes eventually emerge.

    As the Periplan design is planar, the uncompensated field curvature of the fast telescope becomes visible towards the edges of the field of view. This is expected to be less on the slow scopes.

    The CA correction of the Leitz Periplan is optimized for the blue and green wavelengths, and the Leitz microscopes using this eyepiece are accessorized with the green, blue-green and blue Schott filters, cutting the red wavelength to minimum transmission. Light yellow filters are included for the long wavelength fluorescence.

    Therefore, next to the white light test, the eyepiece performance has been tested with the astronomy 470nm Baader bright blue filter, with the “cyan blue” BG 25 Schott, and with the blue-UV B223g Zeiss/Schott. The focus deviations down to 430nm have been found to be within the stress free accommodation of the visual perception (less than 0.1mm focus shift as seen through the eyepiece).

    The views through all tested filters have been found very sharp.
    The highest contrast, balanced with the maximum perceived details resolution, has been found through the cyan blue filter: peak at 390nm (96% transmittance), visually useable pass band up to circa 500nm (20% transmittance). This has been the filter with the maximum modulation transfer of the surface roughness on the blanc metal surface of the chimney.

    Tests on the astronomy objects will be made as soon as weather permits.

    Thanks for reading,

    JG

    PS: Since 1997, the legacy of Leitz microscopes optics is continued by Leica Microsystems,
    https://en.wikipedia.org/wiki/Leica_Microsystems
    The Leitz eyepieces are available at vendors keeping the stock of the surplus and pre-owned parts.
    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
    Astronomy Forum Rules and Terms of Service
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

  2. The Following 4 Users Say Thank You to j.gardavsky For This Useful Post:

    bladekeeper (08-12-2017),Gabby76 (08-12-2017),ProfEclipse (08-13-2017),Trombatissimo (08-12-2017)

  3. #2
    Gabby76's Avatar
    Gabby76 is offline Super Moderator
    Points: 83,523, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 99.8%
    Achievements:
    2 Posts Achievement20 Posts Achievement!Gallery Achievement!Album Achievement!50 Posts Achievement!
    Awards:
    Activity & Post & Thread Master
    Join Date
    Jan 2016
    Location
    Slovakia
    Posts
    19,398
    Points
    83,523
    Level
    100
    Thanks
    3,705
    Thanked 6,017x 5,054 Posts
    Blog Entries
    4

    Default Re: Leitz Periplan GF 12.5x (f=20mm) Eyepiece

    Thank you for the write up JG and I look forward to your observation report.
    Refractors: Antares 105 f/15, Celestron 150 f/8, Stellarvue NHNG 80 f/6.9, TAL 100RS f/10, TS 102 f/11, UR 70 f/10, Vixen SD115s f/7.7
    Mounts: Celestron SLT w/ pier mod & EQ-3 tripod, Celestron hypertuned CG-5 w/ tracking motor & Argo Navis, Manfrotto 028B w/ Stellarvue M2C, Manfrotto 055PRO w/ 128RC, TAL-1 HD EQ, Vixen SXP w/ HAL-130 SXG & half pier
    Diagonals: 2" Astro-Physics MaxBright, 2" Zeiss/ Baader prism, 2" Baader Herschel Wedge (Photo Version), 2"
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    Amici prism, 2" Stellarvue Dielectric, 2" TeleVue Everbrite
    Eyepieces: A-Z

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

    The weakest link in the optical chain is the large nut located directly behind the eyepiece/ camera. - Gabrielle
    Ya gotta keep this Apo/
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    thing in some balance of perspective. Apos are awesome, but long focus Achros aren't that far behind them - Siriusandthepup (CN)

    Refractors kick arse precisely because they don't hide behind excuses. That is, they have no obstructions to hide behind. - Jon Isaacs (CN)

  4. #3
    bladekeeper's Avatar
    bladekeeper is online now Super Moderator
    Points: 304,430, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 100.0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!5 Threads Achievement!50 Posts Achievement!200+ Posts Achievement!
    Awards:
    Activity Award
    Join Date
    Aug 2014
    Location
    Lowell, Arkansas, USA
    Posts
    38,930
    Points
    304,430
    Level
    100
    Thanks
    29,129
    Thanked 17,674x 12,102 Posts

    Default Re: Leitz Periplan GF 12.5x (f=20mm) Eyepiece

    Thanks for the great write-up, JG!
    Bryan

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    :
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    f/5; Celestron C6-R f/8; ES AR127 f/6.4; ES AR127 f/9.4; Stellarvue SV102T f/7; ES AR102 f/9.8;
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    MC90 f/13.3;
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    ST80A f/5; Celestron Premium 80 f/11.4; Celestron C80 f/11.4; Unitron Model 142 f/16; Meade NG60 f/10
    Mounts: Celestron AVX; Bresser EXOS-2; ES Twilight I; ES Twilight II; iOptron Cube-G; AZ3/wood tripod; Vixen
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

    Eyepieces: GSO Super Plössl 40mm, 32mm, 15mm, 9mm; ES 82° Series; GSO Superview 30mm; Celestron Plössl 26mm, 20mm; ES 70° 25mm; ES Plössl 25mm; Vite Aspheric 23mm, 10mm, 4mm; Orion Expanse 20mm, 9mm; KK Ortho 18mm, 12.5mm; Bresser 70° 15mm; Coulter Optical 12.5mm; BCO 10mm; ES 62° 9mm; Zhumell Z Series 5mm
    Binoculars: Pentax PCF WP II 10×50, Bresser Corvette 10×50, Bresser Hunter 16×50 and 8×40, Garrett
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    12×60 LW, Gordon 10×50, Apogee 20×100

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.


    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

    Galaxy Hunter's Creed - When you play whack-a-mole, sometimes you hit 'em on the head, sometimes you miss 'em. But its always fun to play, and if you don't play, you ain't gettin no moles! - KT4HX

  5. #4
    Brodavid1953's Avatar
    Brodavid1953 is offline SUPER GIANT
    Points: 6,978, Level: 58
    Level completed: 14%, Points required for next Level: 172
    Overall activity: 0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!5 Threads Achievement!50 Posts Achievement!200+ Posts Achievement!
    Join Date
    Jul 2017
    Location
    East coast of South Carolina, USA
    Posts
    1,493
    Points
    6,978
    Level
    58
    Thanks
    1,018
    Thanked 421x 403 Posts

    Default Re: Leitz Periplan GF 12.5x (f=20mm) Eyepiece

    Thanks for great report, looking for the observation report.
    Thanks to all, I have learned alot from this group.

    Sarai
    j.gardavsky likes this.
    He has passed on his legacy to his daughter as of 09/26/2017.
    Now he views the stars closeup.
    "If people would look up into the night sky as intently and as passionately as they do their phones, they would be amazed"
    >)))))*>

  6. #5
    not_Fritz_Argelander's Avatar
    not_Fritz_Argelander is online now HYPER GIANT
    Points: 182,949, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 36.0%
    Achievements:
    365 Days+ Registered Achievement!2 Posts Achievement20 Posts Achievement!750 Days+ Registered Achievement!First 1000 Experience Points
    Awards:
    Thread Award
    Join Date
    Jul 2011
    Location
    US
    Posts
    22,040
    Points
    182,949
    Level
    100
    Thanks
    7,254
    Thanked 46,396x 14,954 Posts
    Blog Entries
    59

    Default Re: Leitz Periplan GF 12.5x (f=20mm) Eyepiece

    Thanks and hope to hear more as is convenient.
    j.gardavsky and Brodavid1953 like this.

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    : Refractors:

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    ST80 (mods for white light solar), SV ED80 f7 Newtonians: Z12 f5 Catadioptrics: VMC110L, Intes MK66 EPs: KK Fujiyama Orthoscopics, 2x Vixen NPLs (40-6mm) and BCOs, Baader Mark IV zooms, TV Panoptics, Delos, Plossl 32-8mm. Mixed brand Masuyama/Astroplans Binocular Nikon Aculon 10x50, Celestron 15x70, Baader Maxbright. Mounts: Star Seeker III, Vixen Porta II, Celestron CG5, Orion
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    EQG

  7. #6
    Trombatissimo's Avatar
    Trombatissimo is offline HYPER GIANT
    Points: 10,686, Level: 71
    Level completed: 46%, Points required for next Level: 164
    Overall activity: 0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!50 Posts Achievement!Gallery Achievement!Album Achievement!
    Join Date
    Feb 2017
    Location
    Montreal, Quebec, Canada
    Posts
    1,981
    Points
    10,686
    Level
    71
    Thanks
    951
    Thanked 773x 613 Posts

    Default Re: Leitz Periplan GF 12.5x (f=20mm) Eyepiece

    Thanks for another excellent report that has just been pasted into my technical information file. It sounds like you have a very satisfying first light awaiting you. Clear Skies !
    j.gardavsky likes this.

  8. #7
    j.gardavsky's Avatar
    j.gardavsky is offline Super Moderator
    Points: 111,211, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 23.0%
    Achievements:
    Ghost Achievement! Averaging 5+ posts a day!200+ Posts Achievement!400+ Posts AchievementFirst 1000 Experience Points365 Days+ Registered Achievement!
    Join Date
    Feb 2011
    Location
    Germany
    Posts
    14,415
    Points
    111,211
    Level
    100
    Thanks
    14,417
    Thanked 8,797x 5,725 Posts

    Default Re: Leitz Periplan GF 12.5x (f=20mm) Eyepiece

    Hello not_Fritz,

    the Leitz Periplan will replace another otherwise very good Carl Zeiss Jena PK 12.5x planar and compensating microscopy eyepiece in my collection.
    The reason for the replacement is the higher correction level in the Leitz, and the more advanced multicoatings on the Leitz lenses.
    Thanks to the fusion (in past) between Leitz (Germany) and Wild (Switzerland), the inner fine mechanics for centering and spacing the lenses looks as precise as in a Swiss watch. This also makes a difference.

    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
    Astronomy Forum Rules and Terms of Service
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

  9. #8
    j.gardavsky's Avatar
    j.gardavsky is offline Super Moderator
    Points: 111,211, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 23.0%
    Achievements:
    Ghost Achievement! Averaging 5+ posts a day!200+ Posts Achievement!400+ Posts AchievementFirst 1000 Experience Points365 Days+ Registered Achievement!
    Join Date
    Feb 2011
    Location
    Germany
    Posts
    14,415
    Points
    111,211
    Level
    100
    Thanks
    14,417
    Thanked 8,797x 5,725 Posts

    Default Re: Leitz Periplan GF 12.5x (f=20mm) Eyepiece

    Leitz Periplan GF 12.5x (f=20mm): First light on Saturn and on the M27 Dumbbell Nebula

    Hello all,

    the performance of the Leitz Periplan GF 12.5x (f=20mm) has been tested against the Swarovski 22x “slim” (f=20.9mm) on the 6” F/5 Synta achromatic refractor.
    The Baader triplet Barlow from the BCO set, has been included to check the Leitz Periplan performance at the 2.25x magnification increase factor, see the attached picture.

    The first objects to test the Leitz Pariplan eyepiece have been Saturn and the Dumbbell Nebula.

    Saturn with its angular diameter of 17.4” (CalSky data), and a nice inclination of the rings, has offered a very bright, sharp, and high contrast view through the both eyepieces at the magnifications 37.5x, and 35.9x, respectively.
    The broad grey band on the surface of Saturn has been also seen with high contrast.
    No CA fringes have been seen.
    The Leitz Periplan has shown an ice cool color rendition, the color rendition through the Swarovski has been neutral.
    The best fields for viewing the planet:
    Leitz Periplan: 40% of the FOV, Swarovski: 60% of the FOV

    Mounted on the Baader 2.25x triplet Barlow, the magnifications have been 84.4x, and 80.8x, yielding again very bright, sharp, and contrast views, with no CA fringing.
    The useable FOV for the highest visual resolution has increased on the Leitz Periplan up to 60%,
    and on the Swarovski up to 75%.
    Now, the both eyepieces have pulled the both very thin black arcs of the Cassini division into the resolving capability
    of my aging observing eye.

    M27 Dumbbell Nebula

    The Dumbbell Nebula has been observed through the Leitz Periplan GF 12.5x and Swarovski 22x “slim” eyepieces with and without the Baader 2.25x triplet Barlow, and through the UHC (Astronomik), OIII visual 10nm (Baader),
    and OIII CCD 5nm (Astrodon) filters.

    The nebula has revealed the bright cork surrounded with the bright oval envelop through the both eyepieces with and without Barlow, and through the all 3 filters. No averted vision has been needed.
    The OIII 5nm filter, which passes just the main emission line of the ionized oxygen doublet, has required about 10 – 15 seconds to increase the dark adaptation of the observing eye kept close at the eyepiece.

    The cork has revealed condensations at the bottom, as observed before through the f=10mm Pentax XW and Swarovski SW eyepieces with the UHC (Astronomik) and OIII visual 10nm (Baader) filters on other observing sessions, already on the 15th July 2013.
    This time, the condensations have been more apparent, and moreover, mottling across the cork towards its northern rim became visible. Maybe, now I have simply spent more time with the Dumbbell.

    As I have been switching between the filters and between the eyepieces, and with and without the Barlow, the tests have consumed the time available for the observing session.

    All in all, on this planetary nebula, the both eyepieces, the Leitz Periplan GF 12.5x,
    and the old Swarovski 22x “slim”, are heads on.
    The next test objects will be the Tulip and the Crescent nebulae in Cygnus, weather permitting.

    Date and time: 13th August, 2017, 20:30 – 23:30 local time
    Telescope: 6” F/5 Synta achromatic refractor (Sky-Watcher brand)
    Place: backyard
    Observing conditions: The Double Cluster seen with unaided eyes

    Thanks for reading,

    JG
    Attached Images Attached Images
    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
    Astronomy Forum Rules and Terms of Service
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

  10. The Following 4 Users Say Thank You to j.gardavsky For This Useful Post:

    bladekeeper (08-18-2017),Brodavid1953 (08-18-2017),Gabby76 (08-18-2017),ProfEclipse (08-18-2017)

  11. #9
    Brodavid1953's Avatar
    Brodavid1953 is offline SUPER GIANT
    Points: 6,978, Level: 58
    Level completed: 14%, Points required for next Level: 172
    Overall activity: 0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!5 Threads Achievement!50 Posts Achievement!200+ Posts Achievement!
    Join Date
    Jul 2017
    Location
    East coast of South Carolina, USA
    Posts
    1,493
    Points
    6,978
    Level
    58
    Thanks
    1,018
    Thanked 421x 403 Posts

    Default Re: Leitz Periplan GF 12.5x (f=20mm) Eyepiece

    Thank you taking time to run these tests and do reports on them
    j.gardavsky likes this.
    He has passed on his legacy to his daughter as of 09/26/2017.
    Now he views the stars closeup.
    "If people would look up into the night sky as intently and as passionately as they do their phones, they would be amazed"
    >)))))*>

  12. The Following User Says Thank You to Brodavid1953 For This Useful Post:

    j.gardavsky (08-18-2017)

 

 

Similar Threads

  1. About my 20mm celestron eyepiece.
    By telesue in forum Astronomy Beginners Forum
    Replies: 2
    Last Post: 05-14-2014, 01:33 PM
  2. Looking for a 20mm eyepiece
    By jazzin in forum Telescope Eyepieces Forum
    Replies: 5
    Last Post: 03-03-2014, 01:47 AM
  3. 20mm eyepiece suggestions
    By ysteros in forum Telescope Eyepieces Forum
    Replies: 4
    Last Post: 02-13-2014, 09:39 AM
  4. For Sale - USA: GSO SuperView 20mm eyepiece
    By skaven in forum Astronomy Classifieds
    Replies: 6
    Last Post: 02-02-2014, 12:54 PM
  5. 20mm erecting eyepiece
    By Ronvent in forum Astronomy Beginners Forum
    Replies: 5
    Last Post: 08-20-2013, 11:45 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Powered by vBulletin® Version 4.2.0
Powered by vBulletin®
All times are GMT. The time now is 02:18 AM.