Some lenses to play with on the cloudy days

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j.gardavsky Germany
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Some lenses to play with on the cloudy days

#1

Post by j.gardavsky »


Hello all,

I have received from Oberkochen some of their "deplorable" lenses from the ongoing projects,

lenses group.jpg
Top, left to right: 235mm dia positive 500/88087, and field booster 211
Bottom, left to right: 100mm dia positive doublet 22107, 88mm plan/plan CaF2 crystal 107929, 152mm dia positive meniscus (no ID)

Still considering to buy more CaF2 crystal blanks,
JG
6" F/5 Sky-Watcher achro, 2" BBHS Star Diagonal, 2" zenith prism, 1.25" Takahashi prism
Leica 82mm APO Televid
Eyepieces: Docter UWA; Leica B WW and WW Asph. Zoom; Leica HC Plan S and L, monocentric; Pentax SMC XW, O-, XO; Tak MC O, Carl Zeiss B WW, and Pl, E-Pl, S-Pl, W-Pl;
Swarovski SW; Baader Symmetric Diascope Edition; Nikon NAV SW, ; TMB supermonocentric; Rodenstock; Vixen HR; TV Delos
Filters: Astrodon, Astronomik, Baader, Balzers, Zeiss West and East, Lumicon
Binoculars (7x42 up to 15x85): Docter Nobilem, Leica Ultravid, Nikon Astroluxe, Swarovski EL Swarovision; BA8 (Kunming Optical)
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notFritzArgelander
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Re: Some lenses to play with on the cloudy days

#2

Post by notFritzArgelander »


What mischief are you planning? :)
Scopes: Refs: Orion ST80, SV 80EDA f7, TS 102ED f11 Newts: AWB 130mm, f5, Z12 f5; Cats: VMC110L, Intes MK66,VMC200L f9.75 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 Binoculars: Nikon Aculon 10x50, Celestron 15x70, Baader Maxbright. Mounts: Star Seeker IV, Vixen Porta II, Celestron CG5
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Re: Some lenses to play with on the cloudy days

#3

Post by j.gardavsky »


notFritzArgelander wrote: Thu Oct 21, 2021 1:09 pm What mischief are you planning? :)
There are a few ideas.
One of them is a 200mm aperture fast refractor for the OIII/H-Beta vision.
Another is to make a CaF2 light path corrector and to use its anomalous dispersion characteristic.

Still condidering to buy more CaF2 crystal blancs,
to play with the anomalous dispersion is more tempting than just the extra low dispersion of the ED glass (not crystal) materials.

Thank you for asking,
JG
6" F/5 Sky-Watcher achro, 2" BBHS Star Diagonal, 2" zenith prism, 1.25" Takahashi prism
Leica 82mm APO Televid
Eyepieces: Docter UWA; Leica B WW and WW Asph. Zoom; Leica HC Plan S and L, monocentric; Pentax SMC XW, O-, XO; Tak MC O, Carl Zeiss B WW, and Pl, E-Pl, S-Pl, W-Pl;
Swarovski SW; Baader Symmetric Diascope Edition; Nikon NAV SW, ; TMB supermonocentric; Rodenstock; Vixen HR; TV Delos
Filters: Astrodon, Astronomik, Baader, Balzers, Zeiss West and East, Lumicon
Binoculars (7x42 up to 15x85): Docter Nobilem, Leica Ultravid, Nikon Astroluxe, Swarovski EL Swarovision; BA8 (Kunming Optical)
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Re: Some lenses to play with on the cloudy days

#4

Post by notFritzArgelander »


j.gardavsky wrote: Thu Oct 21, 2021 1:25 pm
notFritzArgelander wrote: Thu Oct 21, 2021 1:09 pm What mischief are you planning? :)
There are a few ideas.
One of them is a 200mm aperture fast refractor for the OIII/H-Beta vision.
Another is to make a CaF2 light path corrector and to use its anomalous dispersion characteristic.

Still condidering to buy more CaF2 crystal blancs,
to play with the anomalous dispersion is more tempting than just the extra low dispersion of the ED glass (not crystal) materials.

Thank you for asking,
JG
Interesting projects to be sure!
Scopes: Refs: Orion ST80, SV 80EDA f7, TS 102ED f11 Newts: AWB 130mm, f5, Z12 f5; Cats: VMC110L, Intes MK66,VMC200L f9.75 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 Binoculars: Nikon Aculon 10x50, Celestron 15x70, Baader Maxbright. Mounts: Star Seeker IV, Vixen Porta II, Celestron CG5
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Makuser United States of America
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Re: Some lenses to play with on the cloudy days

#5

Post by Makuser »


Hi JG. A very interesting set of CaF2 lenses. I was particularly interested in the plan/plan lens in your photo with it's unusual altered convex shape. There a lot of new optic designs being developed now and I call your attention to this one here, at:
https://www.spiedigitallibrary.org/conf ... 9442.short
Thanks for your post and picture JG and the best of wishes with your future optical projects.
Marshall
Sky-Watcher 90mm f/13.8 Maksutov-Cassegrain on motorized Multimount
Orion Astroview 120ST f/5 Refractor on EQ3 mount
Celestron Comet Catcher 140mm f/3.64 Schmidt-Newtonian on alt-az mount
Celestron Omni XLT150R f/5 Refractor on CG4 mount with dual axis drives.
Orion 180mm f/15 Maksutov-Cassegrain on CG5-GT Goto mount.
Orion XT12i 12" f/4.9 Dobsonian Intelliscope.
Kamakura 7x35 Binoculars and Celestron SkyMaster 15x70 Binoculars. ZWO ASI 120MC camera.
>)))))*>
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j.gardavsky Germany
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Re: Some lenses to play with on the cloudy days

#6

Post by j.gardavsky »


Hello Marshall,

the CaF2 crystal lens has a bright convex rim with a faint bluish coating, otherwise planar. The purpose of the rim is not known to me.
It has been likely manufactured by Corning U.S. for a UV (193nm) research and development project in Oberkochen.

One more lens, a cemented triplet is on the way.

Best,
JG
6" F/5 Sky-Watcher achro, 2" BBHS Star Diagonal, 2" zenith prism, 1.25" Takahashi prism
Leica 82mm APO Televid
Eyepieces: Docter UWA; Leica B WW and WW Asph. Zoom; Leica HC Plan S and L, monocentric; Pentax SMC XW, O-, XO; Tak MC O, Carl Zeiss B WW, and Pl, E-Pl, S-Pl, W-Pl;
Swarovski SW; Baader Symmetric Diascope Edition; Nikon NAV SW, ; TMB supermonocentric; Rodenstock; Vixen HR; TV Delos
Filters: Astrodon, Astronomik, Baader, Balzers, Zeiss West and East, Lumicon
Binoculars (7x42 up to 15x85): Docter Nobilem, Leica Ultravid, Nikon Astroluxe, Swarovski EL Swarovision; BA8 (Kunming Optical)
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