This is a Zeiss lens that has a 0.25-metre minimum focusing distance and a 15 mm maximum focal length. If you want to use a filter on the lens, then the filter size is 95 mm.
From Amazon
ZEISS Milvus 15mm f/2.8 Full Frame Camera Lens for Nikon F-Mount ZF.2, Black
WEX Photo Video
Zeiss 15mm f2.8 Milvus ZF.2 Lens - Nikon F Mount
Clifton Cameras
Zeiss Milvus F2.8 15mm Lens ZF.2 Mount