The Conrady's Chromatic Condition ...
- j.gardavsky
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The Conrady's Chromatic Condition ...
From the historical perspective,
there is a downloadable article on the Conrady's Chromatic Condition (in the optical system with the lenses)
in the JRNBS, Vol. 52, No. 1, January 1954, by Donald P. Feder
available as *.pdf
https://www.google.com/url?sa=t&rct=j&q ... P-I2qKx5bw
Happy reading on the rainy days,
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)
- Don Pensack
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Re: The Conrady's Chromatic Condition ...
I used to own a 4"
I could see no color at all at over 200x.
Many of today's doublets have so much color I call them "Jimi Hendrix" scopes ("Purple Haze").
Currently using a 12.5" dob and a 4" apo refractor
- j.gardavsky
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Re: The Conrady's Chromatic Condition ...
and thank you for reminding the Conrady/Sidgwick matrix, which is very popular across The Pond, I mean in the U.S. and Canada.
There is a sort of conceptual problem with what the author(s) are calling the "
This "
Otherwise,
it is comprehensible by means of a trained intuition,
that the high étendue achromats (large
than the low étendue achromats (small
Another conceptual problem emerges with the "Visual Levels of Chromatic Aberration", on which I will comment later.
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;
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)
- Don Pensack
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Re: The Conrady's Chromatic Condition ...
Yes, it is more of a subjective scale and applies more to the older crown/flint objectives of 100 years ago than it does today in the era of FPL-53 and FCD100 glass.
There is math behind the
A real examination has to be a lot more nuanced.
A more scholarly approach can be found here:
https://www.telescope-optics.net/refractor.htm
and in the pages that follow.
Currently using a 12.5" dob and a 4" apo refractor
- j.gardavsky
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Re: The Conrady's Chromatic Condition ...
I can easily decloak the matrix and put an explanation for the
And I can return the matrix for other glass materials as well.
For the optics calculations, there are more modern (in terms of the mathematics) references than the telescopeѲptics.net.
This should be somehow updated for our forums.
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;
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)
- Don Pensack
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Re: The Conrady's Chromatic Condition ...
Vlad's work is a bit dated for the most recent developments in refractor lenses and glass types.
Fortunately, progress never stands still.
When describing
And it also depends on circumstances.
In night use, I never saw
I presume the activation of the cones in my eyes made me more sensitive to deep violet as well as orange and red, colors essentially invisible at night with scotopic vision.
And there is more than
My
In contrast. an
Optical lens configurations on modern scopes are all over the place in terms of their color correction.
Personally, I prefer scopes with mirrors, but, even there, lens assemblies are added to provide
Currently using a 12.5" dob and a 4" apo refractor
- WilliamPaolini
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Re: The Conrady's Chromatic Condition ...
U.S.A.F. Veteran - Visual Amateur Astronomer since 1966 - Fully Retired since 2019
8" f/5 Newt - Lunt 152 f/7.9 - TSA 102 f/8 - Vixen 81S f/7.7 - P.S.T. - Pentax 65ED II - Nikon 12x50 AE
Pentax XWs - Baader Morpheus - Takahashi LEs - Edmund RKEs - BST Starguiders - 6ZAO-II/5XO/4Abbe
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- Lady Fraktor
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Re: The Conrady's Chromatic Condition ...
I thoroughly enjoy using my various achromats and have even been thinking of a Vixen A105M to add into the mix.
See Far Sticks: Elita 103/1575, AOM FLT 105/1000, Bresser 127/1200 BV, Nočný stopár 152/1200, Vyrobené doma 70/700, Stellarvue NHNG DX 80/552, TAL RS 100/1000, Vixen SD115s/885
EQ: TAL MT-1, Vixen SXP, SXP2, AXJ, AXD
Az/Alt: AYO Digi II, Stellarvue M2C, Argo Navis encoders on both
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, Tak prism, TAL, Vixen
Eyepieces: Antares to Zeiss (1000101)
The only culture I have is from yogurt
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