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 Sony FE 40mm F2.5 G 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 Sony FE 40mm F2.5 G with a length of 45mm, is 86mm shorter. Besides being longer, the Sigma 40mm F1.4 DG HSM A also has a larger diameter of 88mm compared to the Sony FE 40mm F2.5 G's 68mm 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.
Below you can find the dimension and weight table of the Standard Prime Lenses in Sony E Mount for size comparison purposes.
Standard Lenses in Sony E Mount for Size Comparison
Filter Threads
The Sigma 40mm F1.4 DG HSM A has a filter size of 82mm whereas the Sony FE 40mm F2.5 G has a 49mm 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 49mm filters that we recommend for the Sony FE 40mm F2.5 G:
Lens Mounts
Both the Sigma 40mm F1.4 DG HSM A and the Sony FE 40mm F2.5 G has the same Sony E lens mount. Some of the latest released cameras that are compatible with the Sony E lenses are Sony A9 III, Sony A7C Mark II and Sony A7CR.
Sigma 40mm F1.4 DG HSM A is also available in Canon EF , Nikon F (FX), Sigma SA and Leica L mounts.
Focal Range
Both lenses have the same focal range of
40mm but while Sigma 40mm F1.4 DG HSM A has the fastest aperture of
F1.4, the Sony FE 40mm F2.5 G's widest aperture value is
F2.5.