The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 18-50mm F2.8 DC DN C and the Sigma 8mm F3.5 EX DG Fisheye for their suitability to various photography scenarios:
Size and Weight Comparison
The size of a lens is a crucial factor to consider when comparing two lenses. Sigma 18-50mm F2.8 DC DN C is the longer of the two lenses at 75mm. The Sigma 8mm F3.5 EX DG Fisheye with a length of 69mm, is 6mm shorter. On the other hand, the Sigma 8mm F3.5 EX DG Fisheye has a larger diameter of 74mm compared to the Sigma 18-50mm F2.8 DC DN C's 65mm diameter.
The weight of a lens is equally significant as its external dimensions, particularly if you intend to handhold your camera and lens combination for extended periods. Sigma 18-50mm F2.8 DC DN C weighs 290g, which means it is 110g (27%) lighter than the Sigma 8mm F3.5 EX DG Fisheye which has a weight of 400g.
Lens Mounts
The Sigma 18-50mm F2.8 DC DN C has the Sony E lens mount whereas the Sigma 8mm F3.5 EX DG Fisheye has the Canon EF lens mount. Some of the latest released cameras that are compatible with these mounts are Sony ZV-E10 II, Sony A6700 and Sony FX30 for the Sony E Mount and Blackmagic URSA 12K LF, Z CAM E2-F6 II 6K and Z CAM E2-S6 II 6K for the Canon EF Mount.
Sigma 18-50mm F2.8 DC DN C is also available in the Leica L and Fujifilm X mounts.
Sigma 8mm F3.5 EX DG Fisheye is also available in Nikon F (FX) and Sigma SA mounts.
Focal Range
Sigma 18-50mm F2.8 DC DN C has a focal range of 18-50mm and
2.8X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of
27-75mm when used on a APS-C / DX format camera.
On the other hand, the Sigma 8mm F3.5 EX DG Fisheye is a prime lens with fixed focal lenght of 8mm. When it is mounted on an APS-C sensor camera with 1.6x crop, it provides a 35mm (FF) equivalent of 12.8mm.
