The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 40mm F1.4 DG HSM A and the Canon RF 35mm F1.8 IS STM 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. Sigma 40mm F1.4 DG HSM A is the longer of the two lenses at 131mm. The Canon RF 35mm F1.8 IS STM Macro with a length of 63mm, is 68mm shorter. Besides being longer, the Sigma 40mm F1.4 DG HSM A also has a larger diameter of 88mm compared to the Canon RF 35mm F1.8 IS STM Macro's 74mm 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 35mm F1.8 IS STM Macro weighs 305g, 74% (895g) lighter than the Sigma 40mm F1.4 DG HSM A's weight of 1200g.
Filter Threads
The Sigma 40mm F1.4 DG HSM A has a filter size of 82mm whereas the Canon RF 35mm F1.8 IS STM Macro has a 52mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 82mm filters that we recommend you to consider for the Sigma 40mm F1.4 DG HSM A:
And these are the 52mm filters that we recommend for the Canon RF 35mm F1.8 IS STM Macro:
Lens Mounts
The Sigma 40mm F1.4 DG HSM A has the Canon EF lens mount whereas the Canon RF 35mm F1.8 IS STM Macro has the Canon RF lens mount. Some of the latest released cameras that are compatible with these mounts are Blackmagic URSA 12K LF, Z CAM E2-F6 II 6K and Z CAM E2-S6 II 6K for the Canon EF Mount and Canon R6 V, Canon R6 III and Canon C50 for the Canon RF Mount.
Sigma 40mm F1.4 DG HSM A is also available in the Nikon F (FX) , Sigma SA, Sony E and Leica L mounts.
Focal Range
Sigma 40mm F1.4 DG HSM A is a prime lens with fixed focal lenght of 40mm. When it is mounted on an APS-C sensor camera with 1.6x crop, it provides a 35mm (FF) equivalent of
64mm.
On the other hand, the Canon RF 35mm F1.8 IS STM Macro is a prime lens with fixed focal lenght of 35mm. When it is mounted on an APS-C sensor camera with 1.6x crop, it provides a 35mm (FF) equivalent of 56mm.
