The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 56mm F1.4 C and the Sigma 18-50mm F2.8 DC DN C RF 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 RF is the longer of the two lenses at 75mm. The Sigma 56mm F1.4 C with a length of 60mm, is 15mm shorter. Besides being longer, the Sigma 18-50mm F2.8 DC DN C RF also has a larger diameter of 69mm compared to the Sigma 56mm F1.4 C's 67mm 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 56mm F1.4 C weighs 280g, which means it is 20g (6%) lighter than the Sigma 18-50mm F2.8 DC DN C RF which has a weight of 300g.
Filter Threads
Both the Sigma 56mm F1.4 C and the Sigma 18-50mm F2.8 DC DN C RF 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
Both the Sigma 56mm F1.4 C and the Sigma 18-50mm F2.8 DC DN C RF has the same Canon RF lens mount. Some of the latest released cameras that are compatible with the Canon RF lenses are Canon R50 V, Canon R100 and Canon R50.
Sigma 56mm F1.4 C is also available in the Fujifilm X and Nikon Z mounts.
Focal Range
Sigma 56mm F1.4 C is a prime lens with fixed focal lenght of 56mm which has an effective (full-frame 35mm equivalent) focal range of
89.6mm when used on a APS-C / DX format camera.
On the other hand, the Sigma 18-50mm F2.8 DC DN C RF has a focal range of 18-50mm and 2.8X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 28.8-80mm when used on a APS-C / DX format camera.
