Buy from Amazon.com : http://fave.co/1FzN75d
Zeiss 55mm f/1.4 Otus Distagon T* Lens for Nikon F Mount
Product Description :
Fast f14 maximum aperture for shallow depth of field and low-light performance
Engineered for optimal image quality using a DSLR with a full-frame sensor
Zeiss T anti-reflective coated lens system enhances image contrast and clarity
Floating element design with 12 elements in 10 groups
All-metal focus mechanism with extended angle of rotation for precise focus placement