Welche Aussage hat das rote T bei dem Zeiss Jena Objektiv, eine nicht Vergütung?Zitat von urmelchen
Die Bedeutung von dem roten T* bei Zeiss ist: Was bedeutet T*? (zeiss.com)
Gruß Ewald
Hilfreich? Unterstütze den DCC!
Welche Aussage hat das rote T bei dem Zeiss Jena Objektiv, eine nicht Vergütung?
Die Bedeutung von dem roten T* bei Zeiss ist: Was bedeutet T*? (zeiss.com)
Gruß Ewald
Aus https://www.digicamclub.de/showthread.php?t=9776&page=3
Historisch kennzeichnet das rote T die Antireflexbeschichtung der Firma Zeiss.
Technologisch gibt es (lassen wir einmal moderne Mottenschichten beiseite) nur 4 verschiedene Entspiegelungsformen:
1. Einschichtvergütung (breitbandige Entspiegelung, die Reflexionen auf Glasoberflächen von ~4% auf etwa 1,7/1,8% reduziert hat) - wird Heute nicht mehr eingesetzt.
2. Zweischichtvergütung (schmalbandige Entspiegelung, die für optische Geräte im VIS nicht von Bedeutung ist, auf nahezu 0% red.) - wird Heute für Laser eingesetzt.
3. Dreischichtvergütung (erste breitbandige Entspiegelung, die den VIS nicht ganz ausfüllt, aber auf etwa 0,4% kommt) - wird Heute nicht mehr eingesetzt.
4. Vierschichtvergütung (wurde kurz nach 3. entwickelt und deckt sowohl den VIS vollständig ab und schafft Werte nahezu 0% Reflexion) - wird Heute ausschließlich für opt. Geräte im VIS eingesetzt.
Für alle Besichtungstechnologien werden verschiedene Variationen zw. Beschichtungselement (z.B. Magnesiumflourid) und Dicke der Schichten eingesetzt um durch geschicktes variieren genau Lamda/4 der eintreffenden Wellenlänge zu treffen was eine destruktive Inteferenz der entsprechenden Wellenlänge zur Folge hat --> keine Reflexion.
Die "T*" - Markierung ist hier lediglich ein Markenname der nicht auf Elemente und Parameter noch auf Beschichtungssystem (themisches Verdampfen, Sputtern) schlussfolgern lässt.
T* bedeutet Heute lediglich = Vierschichtvergütung.
Aus http://www.msscweb.org/public/articl...y_of_Zeiss.pdf
Another noteworthy milestone was on November 1, 1935 when
Alexander Smakula a staff member at Zeiss developed and then
patented anti- reflective (T Transparenz /) coatings thereby
improving light transmission dramatically over uncoated lenses in
binoculars to over 80 per cent, reducing ghost images and
finding other applications for the advances of optics in many
other fields. The AR coatings remained a military secret until
about 1940. By 1990, Zeiss Oberkochen would improve the anti
reflective coatings to transmit more than 90 percent of the light
entering a binocular (the T* designation). In 1988 "Phase
Correction" coatings were introduced on all Carl Zeiss
Oberkochen roof prism binoculars. Phase Correction facilitates a
more uniform throughput of light across a wide portion of the
visual spectrum thereby resulting in further improvements of
resolution and contrast of systems incorporating roof prisms.
Aus https://web.archive.org/web/20151219...p/t-38157.html
The German patent for lens coating was registered by Alexander Smakula of Carl Zeiss Jena in 1935, issued in 1937, and published in November, 1944 - indicating that it was kept as a secret until it had become clear that the allies were capable of producing coated lenses as well as their axis counterparts; there are rumours on the net that lens coating had been invented earlier (by simply tarnishing lenses on the air or immersing them in calcium salts as this had been known since the turn of the last cerntury), and that viable coating had been invented by the Carl P. Goerz factory in Berlin for their field glasses, but I have not seen proof of the latter; obviously a similar invention had been made in the U.S. in the mid-thirties, I have seen a document about that but keep forgetting the name of the inventors. Japanese periscopes are also being said to have been coated prior to WWII, but I have also not seen any documents.
As far as CZJ is concerned, coated and uncoated lenses were produced during the pre-war period and wartime, and there is much in favour of the theory that coated lenses were primarily sold to the military and to researchers; at least my issue of "Neue Foto Schule" by Hans Windisch, a very detailed book for the amateur market, does refer to light loss along reflecting surfaces, but not to lens coating at all as late as 1940, and CZJ advertising from the 1930s and early 1940s does not, either.
By the end of WWII it was clear that lens coating would be available to anybody wanting to put some effort in the issue - and that the CZJ patents would not be of much interest in an occupied country; I have often heard the claim that every lens leaving the CZJ plant after WWII was coated (this issue would still have to be settled in my opinion, circumstances seem to have been rather chaotic, serial numbers from some 2.700.000 were in disarray, coated lenses were not always marked with the red "T", uncoated lenses were coated after-market - we will probably never know).
Nach der Revision bei Olbrich durfte der Tage "mein" Dachbodenfund-Biotar mit zur Gassirunde. Und ja sehr speziell aber trotzdem sehr nett.
Und abgeblendet kann es auch Scharf. Ablichtungserlaubniss der Hundedame liegt vor :-)
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