The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sony DT 50mm F1.8 SAM and the Sigma 50mm F2.8 EX DG Macro for their suitability to various photography scenarios:
Size and Weight Comparison
Size of a lens is an important deciding factor when comparing two lenses.Sigma 50mm F2.8 EX DG Macro is the longer of the two lenses at 67mm. The Sony DT 50mm F1.8 SAM with a length of 45mm is 22mm shorter. Besides being longer, the Sigma 50mm F2.8 EX DG Macro also has a larger diameter of 71mm compared to Sony DT 50mm F1.8 SAM's 70mm diameter.
Weight of a lens is as important as its external dimensions, especially if you are planning to hand hold your camera and lens combination for longer periods. Sony DT 50mm F1.8 SAM weighs 170g, which means it is 150g (46%) lighter than the Sigma 50mm F2.8 EX DG Macro which has a weight of 320g.
Both Sony DT 50mm F1.8 SAM and Sigma 50mm F2.8 EX DG Macro has the same Sony Alpha lens mount. Some of the latest released cameras that are compatible with the Sony Alpha lenses are Sony A68, Sony A77 II and Sony A58.
Sigma 50mm F2.8 EX DG Macro is also available in Canon EF , Pentax KAF, Sigma SA and Nikon F (FX) mounts.