The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Canon RF-S 18-150mm f3.5-6.3 IS and the Sigma 50mm F2.8 Macro 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. Canon RF-S 18-150mm f3.5-6.3 IS is the longer of the two lenses at 95mm. The Sigma 50mm F2.8 Macro with a length of 67mm, is 28mm shorter. On the other hand, the Sigma 50mm F2.8 Macro has a larger diameter of 71mm compared to the Canon RF-S 18-150mm f3.5-6.3 IS's 69mm 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. Canon RF-S 18-150mm f3.5-6.3 IS weighs 310g, which means it is 10g (3%) lighter than the Sigma 50mm F2.8 Macro which has a weight of 320g.
Filter Threads
Both the Canon RF-S 18-150mm f3.5-6.3 IS and the Sigma 50mm F2.8 Macro have the same Filter thread size of 55mm.
Below are links to the 55mm filters that we recommend you to consider for these lenses:
Lens Mounts
The Canon RF-S 18-150mm f3.5-6.3 IS has the Canon RF lens mount whereas the Sigma 50mm F2.8 Macro has the Nikon F (FX) lens mount. Some of the latest released cameras that are compatible with these mounts are Canon R50 V, Canon R100 and Canon R50 for the Canon RF Mount and Nikon D6, Nikon D780 and Nikon D3500 for the Nikon F (FX) Mount.
Sigma 50mm F2.8 Macro is also available in Canon EF , Pentax KAF, Sony Alpha and Sigma SA mounts.
Focal Range
Canon RF-S 18-150mm f3.5-6.3 IS has a focal range of 18-150mm and
8.3X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of
28.8-240mm when used on a APS-C / DX format camera.
On the other hand, the Sigma 50mm F2.8 Macro is a prime lens with fixed focal lenght of 50mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 75mm.
