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on Jul 3, 2023 2:13:54 GMT
Posted: Jul 3, 2023 2:13:54 GMT
Add in to this mix that the definition of "multi-coating" is whatever you want to call it. Minolta, in my opinion, was the first Japanese lens manufacturer to use multi-coating by applying more than one layer of coating on some glass surfaces of some lenses. Je croyais que c'était PENTAX ( SMC) avec la collaboration de ZEISS (T*) en 1971! I thought it was Pentax > SMC with the collaboration of Zeiss > T*
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Status: Long, long time Contax and Yashica user; glad to be here and hope to contribute.
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on Jul 3, 2023 10:20:23 GMT
Posted: Jul 3, 2023 10:20:23 GMT
Add in to this mix that the definition of "multi-coating" is whatever you want to call it. Minolta, in my opinion, was the first Japanese lens manufacturer to use multi-coating by applying more than one layer of coating on some glass surfaces of some lenses. Je croyais que c'était PENTAX ( SMC) avec la collaboration de ZEISS (T*) en 1971! I thought it was Pentax > SMC with the collaboration of Zeiss > T*Hello and welcome to the Forum. Bonjour et bienvenue sur le forum. Zeiss patented their T coating, which improved light Transmission to around 80% of light transiting through a lens, in 1935. It was a single coating applied to all glass which faced air (typically the front and rear elements). Zeiss had already produced a multicoating process when Pentax introduced and highlighted the multi-coatings of their SMC lenses; Zeiss then recognised that multicoating represented a marketing opportunity. Their enhanced T coating, now containing at least 6 layers of coatings, was now called T* ( Transmission Extra) and although it had been used since at least 1972, it had not been described as the new version and many lenses simply carried the well-known red T. The important difference between the original T from 1935 and the new T* was that light transmission had increased from around 80% to just over 90%. So, it is arguable that if Pentax had not highlighted their multicoating as a marketing tactic, we might not have known about the Zeiss upgrade in coating technology for a long time. That being said, the improved coatings had been commented upon by people using gun-sights and binoculars before the photographic community was alerted to its existence. When the collaboration of Yashica (electronics), Porsche (design) and Zeiss (optics) came together to create the Contax RTS in the early 1970s, the T* Coatings were a major part of the 'superior performance' message of the marque. The new coatings vary according to the requirements of different optical needs and can involve a surprisingly large number of layers for some specialist applications.
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on Jul 4, 2023 17:27:32 GMT
Posted: Jul 4, 2023 17:27:32 GMT
Excellent summary there, Graham!
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