The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 50mm F2.8 EX DG Macro and the Carl Zeiss Planar T1,4/50 for their suitability to various photography scenarios:
Size and Weight Comparison
The size of a lens is an important deciding factor when comparing two lenses. Carl Zeiss Planar T1,4/50 is the longer of the two lenses at 69mm. The Sigma 50mm F2.8 EX DG Macro with a length of 67mm, is 2mm shorter. On the other hand, the Sigma 50mm F2.8 EX DG Macro has a larger diameter of 71mm compared to the Carl Zeiss Planar T1,4/50's 66mm diameter.
The 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. Sigma 50mm F2.8 EX DG Macro weighs 320g, which means it is 30g (8%) lighter than the Carl Zeiss Planar T1,4/50 which has a weight of 350g.
Lens Mounts
Both the Sigma 50mm F2.8 EX DG Macro and the Carl Zeiss Planar T1,4/50 has the same Canon EF lens mount. Some of the latest released cameras that are compatible with the Canon EF lenses are Canon 1D X III, Canon 6D MII and Canon 5D MIV.
Sigma 50mm F2.8 EX DG Macro is also available in Pentax KAF , Sony Alpha, Sigma SA and Nikon F (FX) mounts.
Carl Zeiss Planar T1,4/50 is also available in Pentax KAF and Nikon F (FX) mounts.
Focal Range
Both lenses have the same focal range of 50mm but while Sigma 50mm F2.8 EX DG Macro has the fastest aperture of F2.8, the Carl Zeiss Planar T1,4/50's widest aperture value is F1.4.