The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 50mm F1.4 DG DN Art and the Sigma 40mm 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 DN Art with a length of 110mm, is 45mm 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 DN Art's 78mm 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 DN Art weighs 669g, which means it is 626g (48%) lighter than the Sigma 40mm F1.4 DG HSM A which has a weight of 1295g.
Filter Threads
The Sigma 50mm F1.4 DG DN Art has a filter size of 72mm whereas the Sigma 40mm F1.4 DG HSM A has a 82mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 72mm filters that we recommend you to consider for the Sigma 50mm F1.4 DG DN Art:
And these are the 82mm filters that we recommend for the Sigma 40mm F1.4 DG HSM A:
Lens Mounts
The Sigma 50mm F1.4 DG DN Art has the Sony E lens mount whereas the Sigma 40mm F1.4 DG HSM A has the Leica L lens mount. Some of the latest released cameras that are compatible with these mounts are Sony FX5, Sony A7R VI and Sony A7 V for the Sony E Mount and Leica SL3-P, Panasonic S1 II and Panasonic S1 IIE for the Leica L Mount.
Sigma 50mm F1.4 DG DN Art is also available in the Leica L mount.
Sigma 40mm F1.4 DG HSM A is also available in Canon EF , Nikon F (FX), Sigma SA and Sony E mounts.
Focal Range
Sigma 50mm F1.4 DG DN Art 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.
On the other hand, the Sigma 40mm F1.4 DG HSM A is a prime lens with fixed focal lenght of 40mm.
