The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sony E PZ 18-105mm F4 G and the Sigma 17-70mm F2.8-4 DC OS HSM C 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. Sony E PZ 18-105mm F4 G is the longer of the two lenses at 110mm. The Sigma 17-70mm F2.8-4 DC OS HSM C with a length of 82mm, is 28mm shorter. On the other hand, the Sigma 17-70mm F2.8-4 DC OS HSM C has a larger diameter of 79mm compared to the Sony E PZ 18-105mm F4 G's 78mm 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 17-70mm F2.8-4 DC OS HSM C weighs 465g, 3% (17g) lighter than the Sony E PZ 18-105mm F4 G's weight of 482g.
Filter Threads
Both the Sony E PZ 18-105mm F4 G and the Sigma 17-70mm F2.8-4 DC OS HSM C have the same Filter thread size of 72mm.
Below are links to the 72mm filters that we recommend you to consider for these lenses:
Lens Mounts
The Sony E PZ 18-105mm F4 G has the Sony E lens mount whereas the Sigma 17-70mm F2.8-4 DC OS HSM C has the Sony Alpha lens mount. Some of the latest released cameras that are compatible with these mounts are Sony ZV-E10 II, Sony A6700 and Sony FX30 for the Sony E Mount and Sony A68, Sony A77 II and Sony A58 for the Sony Alpha Mount.
Sigma 17-70mm F2.8-4 DC OS HSM C is also available in Canon EF , Pentax KAF3, Sigma SA and Nikon F (DX) mounts.
Focal Range
Sony E PZ 18-105mm F4 G has a focal range of 18-105mm and
5.8X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of
27-157.5mm when used on a APS-C / DX format camera.
On the other hand, the Sigma 17-70mm F2.8-4 DC OS HSM C has a focal range of 17-70mm and 4.1X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 25.5-105mm when used on a APS-C / DX format camera.
