The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Samyang 100mm F2.8 Macro and the Sigma 70mm F2.8 EX DG Macro 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. Samyang 100mm F2.8 Macro is the longer of the two lenses at 123mm. The Sigma 70mm F2.8 EX DG Macro with a length of 95mm, is 28mm shorter. On the other hand, the Sigma 70mm F2.8 EX DG Macro has a larger diameter of 76mm compared to the Samyang 100mm F2.8 Macro's 73mm 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 70mm F2.8 EX DG Macro weighs 527g, 26% (193g) lighter than the Samyang 100mm F2.8 Macro's weight of 720g.
Below you can find the dimension and weight table of the Telephoto Macro Lenses in Pentax KAF Mount for size comparison purposes.
Macro Lenses in Pentax KAF Mount for Size Comparison
Lens Mounts
Both the Samyang 100mm F2.8 Macro and the Sigma 70mm F2.8 EX DG Macro has the same Pentax KAF lens mount. Some of the latest released cameras that are compatible with the Pentax KAF lenses are Pentax K-3 III Mono, Pentax KF and Pentax K-3 III.
Samyang 100mm F2.8 Macro is also available in the Canon EF , Fujifilm X, Micro Four Thirds, Nikon F (FX), Samsung NX, Sony Alpha and Sony E mounts.
Sigma 70mm F2.8 EX DG Macro is also available in Canon EF , Nikon F (FX), Sony Alpha and Sigma SA mounts.
Focal Range
Samyang 100mm F2.8 Macro is a prime lens with fixed focal lenght of 100mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
150mm.
On the other hand, the Sigma 70mm F2.8 EX DG Macro is a prime lens with fixed focal lenght of 70mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 105mm.
