The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Zeiss Milvus 15mm F2.8 and the Sigma 15mm F2.8 EX DG Fisheye for their suitability to various photography scenarios:
Size and Weight Comparison
Size of a lens is an important deciding factor when comparing two lenses.Zeiss Milvus 15mm F2.8 is the longer of the two lenses at 100mm. The Sigma 15mm F2.8 EX DG Fisheye with a length of 65mm is 35mm shorter. Besides being longer, the Zeiss Milvus 15mm F2.8 also has a larger diameter of 102mm compared to Sigma 15mm F2.8 EX DG Fisheye's 74mm diameter.
Weight of a lens is as important as its external dimensions, especially if you are planning to hand hold your camera and lens combination for longer periods. Sigma 15mm F2.8 EX DG Fisheye weighs 370g, 60% (577g) lighter than the Zeiss Milvus 15mm F2.8's weight of 947g.
Both Zeiss Milvus 15mm F2.8 and Sigma 15mm F2.8 EX DG Fisheye has the same Nikon F (FX) lens mount. Some of the latest released cameras that are compatible with the Nikon F (FX) lenses are Nikon D6, Nikon D780 and Nikon D3500.
Zeiss Milvus 15mm F2.8 is also available in Canon EF mount.
Sigma 15mm F2.8 EX DG Fisheye is also available in Canon EF , Pentax KAF, Sony Alpha and Sigma SA mounts.
Both lenses have the same focal range of 15mm and the fastest aperture of F2.8.