от: РыбакШу
Вопрос простой ... на старых Цейсах стоит красная Т (без звезды) - это однослойное просветление или , всё-таки , многослойное ?
Alexander Smakula from Carl Zeiss Jena had at that time already discovered that when light enters or leaves a lens, a certain percentage of the light is reflected from the boundaries. Depending on the type of glass used this is usually between 4 and 8%, and depending on the number of lenses the total light lost can be more than 50%. Smakula countered this significant disadvantage by covering the surface of the lenses with extremely thin layers of special materials. In doing so he changed the transfer of air to glass, thereby reducing the reflections. This led to greatly improved light transmission. Binoculars and riflescopes with this "Transmission layer" were from that point, given the designation "T", and the improved multi-layer coating developed at the end of the ‘70s was named "T*". The process involves the vapour deposition in a high vacuum of layers of material, with each of the six or so layers adding approx. 1/10,000 mm.
http://sportsoptics.zeiss.com/hunting/en_de/experience/competences/lens-coating.html







