The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Fujinon MK 18-55mm T2.9 and the Sigma 17-50mm F2.8 EX DC OS 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. Fujinon MK 18-55mm T2.9 is the longer of the two lenses at 206mm. The Sigma 17-50mm F2.8 EX DC OS HSM with a length of 92mm, is 114mm shorter. Besides being longer, the Fujinon MK 18-55mm T2.9 also has a larger diameter of 85mm compared to the Sigma 17-50mm F2.8 EX DC OS HSM's 84mm 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 17-50mm F2.8 EX DC OS HSM weighs 565g, 42% (415g) lighter than the Fujinon MK 18-55mm T2.9's weight of 980g.
Filter Threads
The Fujinon MK 18-55mm T2.9 has a filter size of 82mm whereas the Sigma 17-50mm F2.8 EX DC OS HSM has a 77mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 82mm filters that we recommend you to consider for the Fujinon MK 18-55mm T2.9:
And these are the 77mm filters that we recommend for the Sigma 17-50mm F2.8 EX DC OS HSM:
Lens Mounts
The Fujinon MK 18-55mm T2.9 has the Sony E lens mount whereas the Sigma 17-50mm F2.8 EX DC OS HSM has the Sigma SA lens mount. Some of the latest released cameras that are compatible with these mounts are Sony FX5, Sony A7R VI and Sony A7 V for the Sony E Mount and Sigma SD1 Merrill, Sigma SD1 and for the Sigma SA Mount.
Sigma 17-50mm F2.8 EX DC OS HSM is also available in Canon EF , Pentax KAF3, Sony Alpha and Nikon F (DX) mounts.
Focal Range
Fujinon MK 18-55mm T2.9 has a focal range of 18-55mm and
3.1X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
27 - 82.5mm.
On the other hand, the Sigma 17-50mm F2.8 EX DC OS HSM has a focal range of 17-50mm and 2.9X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 25.5-75mm when used on a APS-C / DX format camera.
