Evolution of Eyepieces by Chris Lord
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Evolution of Eyepieces by Chris Lord
http://www.brayebrookobservatory.org/Br ... PIECES.pdf
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Re: Evolution of Eyepieces by Chris Lord
Cheers,
JT
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Re: Evolution of Eyepieces by Chris Lord
Yes, it is public domain. The link is direct to Chris Lord's website and is open access!
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Re: Evolution of Eyepieces by Chris Lord
Mounts: SW: SkyTee2, AzGTi; iOptron: AZMP; ES: Twilight I; Bresser: EXOS2; UA: MicroStar.
Binos: APM: 100-90 APO; Canon: IS 15x50; Orion: Binoviewer, LG II 15x70, WV 10x50, Nikon: AE 16x50, 10x50, 8x40.
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Re: Evolution of Eyepieces by Chris Lord
The only culture I have is from yogurt
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Re: Evolution of Eyepieces by Chris Lord
Somehow missed the post earlier. Also, figure out it is good to bump it for more exposure.Lady Fraktor wrote: ↑Mon Feb 03, 2020 9:52 pm You had me wondering what was going on Bigzmey, I was sure I had pinned this a long time ago
Mounts: SW: SkyTee2, AzGTi; iOptron: AZMP; ES: Twilight I; Bresser: EXOS2; UA: MicroStar.
Binos: APM: 100-90 APO; Canon: IS 15x50; Orion: Binoviewer, LG II 15x70, WV 10x50, Nikon: AE 16x50, 10x50, 8x40.
EPs: Pentax: XWs & XFs; TeleVue: Delites, Delos, Panoptic & Plossls; ES: 68, 62; Vixen: SLVs; Baader: BCOs, Aspherics, Mark IV.
Diagonals: Baader: BBHS mirror, Zeiss Spec T2 prism, Clicklock dielectric; TeleVue: Evebrite dielectric; AltairAstro: 2" prism.
Filters: Lumicon: DeepSky, UHC, OIII, H-beta; Baader: Moon & SkyGlow, Contrast Booster, UHC-S, 6-color set; Astronomik: UHC.
Solar: HA: Lunt 50mm single stack, W/L: Meade Herschel wedge.
Observing: DSOs: 3122 (Completed: Messier, Herschel 1, 2, 3. In progress: H2,500: 2196, S110: 77). Doubles: 2461, Comets: 34, Asteroids: 261
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Re: Evolution of Eyepieces by Chris Lord
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Re: Evolution of Eyepieces by Chris Lord
Refractors: ES AR152 f/6.5 Achromat on Twilight II, Celestron 102mm XLT f/9.8 on Celestron Heavy Duty Alt Az mount, KOWA 90mm spotting scope
Binoculars: Celestron SkyMaster 15x70, Bushnell 10x50
Eyepieces: Various, GSO Superview, 9mm Plossl, Celestron 25mm Plossl
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Naked Eye: Two Eyeballs
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Re: Evolution of Eyepieces by Chris Lord
on page 44
" It is also quite inappropriate for example.
equipping an
with an
Dobsonian light bucket with a
ultra-wide angle eyepiece. Unless that
is, it is your purpose to loose as much
light as possible and drive image quality
already perilously close to the diffraction
limit, well below it."
I have done these things and with the focal reducer on a F10
The other thing what court my attention is the "Pretoria" eyepiece. Someone asked, on another forum, if there are "telescope correcting" eyepieces available and my response was that I don't think so because the market for it would be too small, I was wrong but right about the market because they are not available anymore. Then the name?! Pretoria is the administrative capital of South Africa, why name a eyepiece after it?
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Re: Evolution of Eyepieces by Chris Lord
https://myscienceshop.com/product/digi ... /tmkpdf029
Pretoria has been a site for observatories so that’s likely the reason I’d guess. If I recall correctly Harvard University had a southern observatory station at Pretoria as did John Herschel?
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Re: Evolution of Eyepieces by Chris Lord
Here is the article: https://astromart.com/reviews/telescope ... stigmatism
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Re: Evolution of Eyepieces by Chris Lord
The Harvard University southern Station were originally in Peru but were moved to Bloemfontein in 1927. It is called Boyden and is 25 Km outside Bloemfontein. I have access to the observatory and have done some of my best viewing with the 15" Obsession from there.notFritzArgelander wrote: ↑Fri May 22, 2020 9:01 am The name is from the design inventors.
https://myscienceshop.com/product/digi ... /tmkpdf029
Pretoria has been a site for observatories so that’s likely the reason I’d guess. If I recall correctly Harvard University had a southern observatory station at Pretoria as did John Herschel?
here is a photo of some famous people taken at Boyden in 1952 : In the centre we have Jan Hendrik Oort and Georges Lemaître
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Re: Evolution of Eyepieces by Chris Lord
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Re: Evolution of Eyepieces by Chris Lord
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Re: Evolution of Eyepieces by Chris Lord
I'm not aware if he is.....WilliamPaolini wrote: ↑Thu May 27, 2021 12:33 am This is an excellent work by Chris! Quite comprehensive and a lot of research on his part. Is Chris a member here?
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Re: Evolution of Eyepieces by Chris Lord
Unfortunately he is not. The treatise is available from his Brayebrook Observatory site.WilliamPaolini wrote: ↑Thu May 27, 2021 12:33 am This is an excellent work by Chris! Quite comprehensive and a lot of research on his part. Is Chris a member here?
The only culture I have is from yogurt
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Re: Evolution of Eyepieces by Chris Lord
Some "Erfle" eyepieces could be Zeiss Astroplantakular, Kaspereit, original Panoptic, Konig, Bertele or whatever. All "Erfle", easier to put on a barrel or label & more widely known than the true longwinded name.
Ex-military is a separate fan base for optics, as other things.
Eyepieces from: Aero, Antares, APM, Baader, Brandon, Bresser, Celestron, Datysun, Docter, Explore Scientific, GSO, I R Poyser, Meade, Nikon, Orion, Pentax, Rodenstock, Siberia, Sky-Watcher, Taiso, Takahashi, TAL, Tele Vue, TS, Vernonscope, Vixen, Zeiss.
Scopes from: Altair, Bresser, Lumicon, Orion Optics UK, Sky-Watcher, Takahashi, Tele Vue, TS, Vixen.
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Re: Evolution of Eyepieces by Chris Lord
The Ur-design has the symmetrical convex/convex middle lens, two lens materials out of five are the same.
The Astro-Planokular has an asymmetrical convex/convex middle lens, and just three different glass materials in its five lenses. Optimized for the observatory grade refractors.
The Zeiss binocular eyepiece, a derivate of Erfle, has two positive focus lenses between the doublets, both of them with different glass materials.
The modern wide field designs (tactical optics) employ a higher level of complication in the material choice and in the variety of the lens surface curvatures,
https://spie.org/publications/pm92_1124 ... iece?SSO=1
https://spie.org/publications/tt82_83_eyepiece?SSO=1
Other examples are the bull's eyes from Leica, Rodenstock (also in my collection), Zeiss, and the Swiss WILD Heerbrugg (also in my collection),
http://web.archive.org/web/200701271148 ... de/F30.htm
The design of the Swarovski 20x S W (f=23mm) spotting eyepiece (in my arsenal) goes back to the Zeiss binocular eyepiece, a derivate of Erfle.
Best,
JG
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;
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Re: Evolution of Eyepieces by Chris Lord
https://www.telescope-optics.net/eyepiece_raytrace.htm
Currently using a 12.5" dob and a 4" apo refractor
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Re: Evolution of Eyepieces by Chris Lord
The Erfles, and some other eyepieces are desribed by the Zeiss designers inDon Pensack wrote: ↑Sat Aug 14, 2021 4:26 pm You might like this information, too:
https://www.telescope-optics.net/eyepiece_raytrace.htm
DIE FERNROHRE UND ENTFERNUNGMESSER
Dr. Phil., Dr.-Ing. E. H. Albert König, and Dr. Rer. Nat. Horst Köhler
3rd enlarged edition, Springer-Verlag Berlin and Heidelberg, 1959
reprint on my bookshelf,
JG
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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