Źródło: https://photographylife.com/zeiss-ma...us-dslr-lenses.So why is Zeiss not making autofocus lenses for DSLR cameras from Nikon and Canon? If you ask folks from Zeiss, they will tell you that it is a licensing issue. Specifically, the standard public response that Zeiss issues is the following: “Due to international licences, it is not possible at the moment for companies outside Japan to offer AF lenses with EF or F mounts” – the same thing that the Zeiss team told me at the Photo Plus expo. But that’s only part of the real reason. Zeiss is a very reputable company and they would never state the exact reasons on why designing AF lenses for Canon EF or Nikon F is an extremely difficult task. The main reason is lack of openness, support and collaboration from Nikon and Canon. You see, neither company has interest in working with third party lens makers, when they have a large array of lenses of their own. Why help promote a third party lens manufacturers and potentially lose sales?
Sigma może mieć problem z tego samego powodu. Nikon i Canon nie udostępniają specyfikacji swoich systemów AF.
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