The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 70mm F2.8 DG Macro and the Sigma 105mm 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. Sigma 70mm F2.8 DG Macro is the longer of the two lenses at 106mm. The Sigma 105mm F2.8 EX DG Macro with a length of 98mm, is 8mm shorter. On the other hand, the Sigma 105mm F2.8 EX DG Macro has a larger diameter of 74mm compared to the Sigma 70mm F2.8 DG Macro's 71mm 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 105mm F2.8 EX DG Macro weighs 460g, 10% (55g) lighter than the Sigma 70mm F2.8 DG Macro's weight of 515g.
Filter Threads
The Sigma 70mm F2.8 DG Macro has a filter size of 49mm whereas the Sigma 105mm F2.8 EX DG Macro has a 62mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 49mm filters that we recommend you to consider for the Sigma 70mm F2.8 DG Macro:
And these are the 62mm filters that we recommend for the Sigma 105mm F2.8 EX DG Macro:
Lens Mounts
The Sigma 70mm F2.8 DG Macro has the Sigma SA lens mount whereas the Sigma 105mm F2.8 EX DG Macro has the Sony Alpha lens mount. Some of the latest released cameras that are compatible with these mounts are Sigma Quattro, Sigma Quattro H and Sigma SD1 Merrill for the Sigma SA Mount and Sony A99 II, Sony A68 and Sony A77 II for the Sony Alpha Mount.
Sigma 70mm F2.8 DG Macro is also available in the Canon EF , Nikon F (FX) and Sony E mounts.
Sigma 105mm F2.8 EX DG Macro is also available in Canon EF , Nikon F (FX), Pentax KAF, Sigma SA and Four Thirds mounts.
Focal Range
Sigma 70mm F2.8 DG Macro is a prime lens with fixed focal lenght of 70mm.
On the other hand, the Sigma 105mm F2.8 EX DG Macro is a prime lens with fixed focal lenght of 105mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 157.5mm.
