The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 105mm F2.8 EX DG Macro and the Venus 105mm F2 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. Venus 105mm F2 is the longer of the two lenses at 99mm. The Sigma 105mm F2.8 EX DG Macro with a length of 98mm, is 1mm shorter. Besides being longer, the Venus 105mm F2 also has a larger diameter of 76mm compared to the Sigma 105mm F2.8 EX DG Macro's 74mm 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, which means it is 285g (38%) lighter than the Venus 105mm F2 which has a weight of 745g.
Filter Threads
The Sigma 105mm F2.8 EX DG Macro has a filter size of 62mm whereas the Venus 105mm F2 has a 67mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 62mm filters that we recommend you to consider for the Sigma 105mm F2.8 EX DG Macro:
And these are the 67mm filters that we recommend for the Venus 105mm F2:
Lens Mounts
The Sigma 105mm F2.8 EX DG Macro has the Pentax KAF lens mount whereas the Venus 105mm F2 has the Pentax KAF2 lens mount. Some of the latest released cameras that are compatible with these mounts are Pentax K-3 III Monochrome, Pentax KF and Pentax K-3 III for the Pentax KAF Mount and Pentax K-3 III Monochrome, Pentax KF and Pentax K-3 III for the Pentax KAF2 Mount.
Sigma 105mm F2.8 EX DG Macro is also available in Canon EF , Nikon F (FX), Sony Alpha, Sigma SA and Four Thirds mounts.
Venus 105mm F2 is also available in Sony E , Canon EF, Nikon F (FX) and Sony Alpha mounts.
Focal Range
Both lenses have the same focal range of
105mm but while Sigma 105mm F2.8 EX DG Macro has the fastest aperture of
F2.8, the Venus 105mm F2's widest aperture value is
F2.