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 OSS and the Sigma 18-125mm F3.8-5.6 DC HSM 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 OSS is the longer of the two lenses at 110mm. The Sigma 18-125mm F3.8-5.6 DC HSM with a length of 89mm, is 21mm shorter. Besides being longer, the Sony E PZ 18-105mm F4 G OSS also has a larger diameter of 78mm compared to the Sigma 18-125mm F3.8-5.6 DC HSM'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. Sony E PZ 18-105mm F4 G OSS weighs 482g, which means it is 8g (1%) lighter than the Sigma 18-125mm F3.8-5.6 DC HSM which has a weight of 490g.
Filter Threads
The Sony E PZ 18-105mm F4 G OSS has a filter size of 72mm whereas the Sigma 18-125mm F3.8-5.6 DC HSM 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 72mm filters that we recommend you to consider for the Sony E PZ 18-105mm F4 G OSS:
And these are the 62mm filters that we recommend for the Sigma 18-125mm F3.8-5.6 DC HSM:
Lens Mounts
The Sony E PZ 18-105mm F4 G OSS has the Sony E lens mount whereas the Sigma 18-125mm F3.8-5.6 DC HSM has the Sony Alpha lens mount. Some of the latest released cameras that are compatible with these mounts are Sony A6700, Sony FX30 and Sony ZV-E10 for the Sony E Mount and Sony A68, Sony A77 II and Sony A58 for the Sony Alpha Mount.
Sigma 18-125mm F3.8-5.6 DC HSM is also available in Pentax KAF3 mount.
Focal Range
Sony E PZ 18-105mm F4 G OSS 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 18-125mm F3.8-5.6 DC HSM has a focal range of 18-125mm and 6.9X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 27-187.5mm when used on a APS-C / DX format camera.