Evolution of Eyepieces by Chris Lord

Discuss telescope eyepieces.
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Evolution of Eyepieces by Chris Lord

#1

Post by notFritzArgelander »


I just brought this over from the old place. I suggest we make this sticky?

http://www.brayebrookobservatory.org/Br ... PIECES.pdf
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: Evolution of Eyepieces by Chris Lord

#2

Post by JayTee »


My vote is yes for a stickie, but let me ping the other CoAs to get some additional buy-in. A quick question, is this public domain information? BTW, this is an awesome informational reference.

Cheers,
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∞ Primary Scopes: #1: Celestron CPC1100 #2: 8" f/7.5 Dob #3: CR150HD f/8 6" frac
∞ AP Scopes: #1: TPO 6" f/9 RC #2: ES 102 f/7 APO #3: ES 80mm f/6 APO
∞ G&G Scopes: #1: Meade 102mm f/7.8 #2: Bresser 102mm f/4.5
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Re: Evolution of Eyepieces by Chris Lord

#3

Post by notFritzArgelander »


JayTee wrote: Sun Oct 27, 2019 3:50 am My vote is yes for a stickie, but let me ping the other CoAs to get some additional buy-in. A quick question, is this public domain information? BTW, this is an awesome informational reference.

Cheers,
JT
Yes, it is public domain. The link is direct to Chris Lord's website and is open access!
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: Evolution of Eyepieces by Chris Lord

#4

Post by Bigzmey »


Thanks for bringing it over nFA. This reference is must have/read for anyone who is into EPs.
Scopes: Stellarvue: SV102ED; Celestron: 9.25" EdgeHD, 8" SCT, 150ST, Onyx 80ED; iOptron: Hankmeister 6" Mak; SW: 7" Mak; Meade: 80ST.
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, 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.

Observing: DSOs: 3106 (Completed: Messier, Herschel 1, 2, 3. In progress: H2,500: 2180, S110: 77). Doubles: 2382, Comets: 34, Asteroids: 255
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Re: Evolution of Eyepieces by Chris Lord

#5

Post by Lady Fraktor »


You had me wondering what was going on Bigzmey, I was sure I had pinned this a long time ago :)
See Far Sticks: Antares Elita 103/1575, AOM FLT 105/1000, Bresser BV 127/1200, Nočný stopár 152/1200, Vyrobené doma 70/700, Stellarvue NHNG DX 80/552, TAL RS100/1000, Vixen SD115s/885
EQ: TAL MT-1, Vixen SXP, AXJ, AXD
Az/Alt: AYO Digi II/ Argo Navis, Stellarvue M2C/ Argo Navis
Tripods: Berlebach Planet (2), Uni 28 Astro, Report 372, TAL factory maple, Vixen ASG-CB90, Vixen AXD-TR102
Diagonals: Astro-Physics, Baader Amici, Baader Herschel, iStar Blue, Stellarvue DX, Takahashi prism, TAL, Vixen flip mirror
Eyepieces: Antares to Zeiss
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Re: Evolution of Eyepieces by Chris Lord

#6

Post by Bigzmey »


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 :)
Somehow missed the post earlier. Also, figure out it is good to bump it for more exposure. :D
Scopes: Stellarvue: SV102ED; Celestron: 9.25" EdgeHD, 8" SCT, 150ST, Onyx 80ED; iOptron: Hankmeister 6" Mak; SW: 7" Mak; Meade: 80ST.
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, 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.

Observing: DSOs: 3106 (Completed: Messier, Herschel 1, 2, 3. In progress: H2,500: 2180, S110: 77). Doubles: 2382, Comets: 34, Asteroids: 255
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Re: Evolution of Eyepieces by Chris Lord

#7

Post by Ruud »


Here's Lord's eyepiece evolution tree:
Lord-Eyepiece-Evolution-Tree.PDF
(1.29 MiB) Downloaded 390 times
It was a jpeg originally, but it is so big that it works better as a pdf. Zoom in and navigate around the tree.
7x50 Helios Apollo 8x42 Bresser Everest 73mm f/5.9 WO APO 4" f/5 TeleVue Genesis 6" f/10 Celestron 6SE 0.63x reducer 1.8, 2, 2.5 and 3x Barlows eyepieces from 4.5 to 34mm
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Re: Evolution of Eyepieces by Chris Lord

#8

Post by helicon »


Very interesting resource notFritz. Thank you.
-Michael
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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Re: Evolution of Eyepieces by Chris Lord

#9

Post by Piet Le Roux »


Interesting article but way too technical for me, a few thing stood out :
on page 44
" It is also quite inappropriate for example.
equipping an f/10 Schmidt-Cassegrain
with an f/6.3 focal reducer, or an f/4
Dobsonian light bucket with a coma corrector, and then using an 8 element
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 SCT using a Panoptic 27mm I would agree the result was not wonderful but I also manage to borrow a 21mm Ethos that I coupled it with my F4.5 Obsession and Paracorr II......I cannot comment on distortion but the sharpness, edge to edge, in the views were excellent!

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?
Last edited by Piet Le Roux on Fri May 22, 2020 9:13 am, edited 2 times in total.
Main Equipment : Tele Vue 27mm Panoptic, 7&13mm Nagler, Big Barlow : 8" Meade LX90ACF with Meade 2.0" Enhanced Diagonal : Camera Fuji XT100
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Re: Evolution of Eyepieces by Chris Lord

#10

Post by notFritzArgelander »


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?
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: Evolution of Eyepieces by Chris Lord

#11

Post by Piet Le Roux »


PS I found the answer! in another article : "Finally, there is an alternative to the Paracor. It’s called the Pretoria eyepiece. It was designed in the early 1980s by H. W. Klee and M. W. McDowell of the National Physics Research Lab in Pretoria, South Africa."

Here is the article: https://astromart.com/reviews/telescope ... stigmatism
Main Equipment : Tele Vue 27mm Panoptic, 7&13mm Nagler, Big Barlow : 8" Meade LX90ACF with Meade 2.0" Enhanced Diagonal : Camera Fuji XT100
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Re: Evolution of Eyepieces by Chris Lord

#12

Post by Piet Le Roux »


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?
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.
here is a photo of some famous people taken at Boyden in 1952 :
Boyden16_7_1952.jpg
In the centre we have Jan Hendrik Oort and Georges Lemaître
Main Equipment : Tele Vue 27mm Panoptic, 7&13mm Nagler, Big Barlow : 8" Meade LX90ACF with Meade 2.0" Enhanced Diagonal : Camera Fuji XT100
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Re: Evolution of Eyepieces by Chris Lord

#13

Post by Piet Le Roux »


PS the Metcalf telescope, depicted on our club badge, were used to take photographic plates for Harvard University at Boyden, it is still being housed there.
Main Equipment : Tele Vue 27mm Panoptic, 7&13mm Nagler, Big Barlow : 8" Meade LX90ACF with Meade 2.0" Enhanced Diagonal : Camera Fuji XT100
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Re: Evolution of Eyepieces by Chris Lord

#14

Post by WilliamPaolini »


This is an excellent work by Chris! Quite comprehensive and a lot of research on his part. Is Chris a member here?
-Bill

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Re: Evolution of Eyepieces by Chris Lord

#15

Post by notFritzArgelander »


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?
I'm not aware if he is.....
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: Evolution of Eyepieces by Chris Lord

#16

Post by Lady Fraktor »


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?
Unfortunately he is not. The treatise is available from his Brayebrook Observatory site.
See Far Sticks: Antares Elita 103/1575, AOM FLT 105/1000, Bresser BV 127/1200, Nočný stopár 152/1200, Vyrobené doma 70/700, Stellarvue NHNG DX 80/552, TAL RS100/1000, Vixen SD115s/885
EQ: TAL MT-1, Vixen SXP, AXJ, AXD
Az/Alt: AYO Digi II/ Argo Navis, Stellarvue M2C/ Argo Navis
Tripods: Berlebach Planet (2), Uni 28 Astro, Report 372, TAL factory maple, Vixen ASG-CB90, Vixen AXD-TR102
Diagonals: Astro-Physics, Baader Amici, Baader Herschel, iStar Blue, Stellarvue DX, Takahashi prism, TAL, Vixen flip mirror
Eyepieces: Antares to Zeiss
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Re: Evolution of Eyepieces by Chris Lord

#17

Post by 25585 »


As an Erfle-gatherer, and see how some are better than others, I reckon there is common labelling, such as with Plossls/ symmetricals.

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.

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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

#18

Post by j.gardavsky »


Erfle is a pretty adaptable type of the eyepiece designs.
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

PS: The SPIE.org page is on maintanence 14 - 15 August, 2021
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: Evolution of Eyepieces by Chris Lord

#19

Post by Don Pensack »


You might like this information, too:
https://www.telescope-optics.net/eyepiece_raytrace.htm
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Re: Evolution of Eyepieces by Chris Lord

#20

Post by j.gardavsky »


Don Pensack wrote: Sat Aug 14, 2021 4:26 pm You might like this information, too:
https://www.telescope-optics.net/eyepiece_raytrace.htm
The Erfles, and some other eyepieces are desribed by the Zeiss designers in

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
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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