ZEISS Lens, I have not known before.

 (Contax Carl Zeiss Distagon 2.8/28)

As for "Carl Zeiss Lens", it seemed to be German product for any camera geek..
But it was a Japanese lens which I get cheap as a used.
"Contax"was such a Japanese brand for believers of legendary Zeiss camera lens.
Not so few Japanese camera freaks are obsessed by the peal of "ZEISS".　
In fact, Zeiss don't product camera lens so much now. On the more, it had to compensate Nikon for infringement of "stepper patent"with huge reconcile money. But Zeiss does their business with rendering only their brand value to Japanese consumers.
By the way, I used Japanese Zeiss" Distagon".
It was needed to renovated to mount on Canon SLR. It was high color contrast lens (especially azure of sky).Resolution was not so high as Nikon.