The Sonnar is a traditional lens design sought by photographers for many years. This formula has been refined over the years, increasing its speed and reducing lens aberrations to unbelievable levels. The Sonnar T* 90mm F/2.8 is a lens that in utterly perfect for candid or formal portraiture, providing high contrast out to the corners of the image field even at full aperture.
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https://www.cameraland.nl/carl-zeiss-sonnar-t-90mm-f-2-8-contax-g-300940