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 Sigma 50mm F1.4 DG HSM A 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 155mm. The Sigma 50mm F1.4 DG HSM A with a length of 100mm, is 55mm shorter. Besides being longer, the Sigma 40mm F1.4 DG HSM A also has a larger diameter of 88mm compared to the Sigma 50mm F1.4 DG HSM A's 85mm 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 50mm F1.4 DG HSM A weighs 815g, 37% (480g) lighter than the Sigma 40mm F1.4 DG HSM A's weight of 1295g.
Filter Threads
The Sigma 40mm F1.4 DG HSM A has a filter size of 82mm whereas the Sigma 50mm F1.4 DG HSM A has a 77mm 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 77mm filters that we recommend for the Sigma 50mm F1.4 DG HSM A:
Lens Mounts
The Sigma 40mm F1.4 DG HSM A has the Leica L lens mount whereas the Sigma 50mm F1.4 DG HSM A has the Canon EF lens mount. Some of the latest released cameras that are compatible with these mounts are Leica SL3-P, Panasonic S1 II and Panasonic S1 IIE for the Leica L 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 40mm F1.4 DG HSM A is also available in the Canon EF , Nikon F (FX), Sigma SA and Sony E mounts.
Sigma 50mm F1.4 DG HSM A is also available in Sony Alpha , Sigma SA, Nikon F (FX) and Leica L mounts.
Focal Range
Sigma 40mm F1.4 DG HSM A is a prime lens with fixed focal lenght of 40mm.
On the other hand, the Sigma 50mm F1.4 DG HSM A is a prime lens with fixed focal lenght of 50mm. When it is mounted on an APS-C sensor camera with 1.6x crop, it provides a 35mm (FF) equivalent of 80mm.
