The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 24-105mm F4 DG OS HSM and the Olympus ED 7-14mm F2.8 PRO 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 24-105mm F4 DG OS HSM is the longer of the two lenses at 109mm. The Olympus ED 7-14mm F2.8 PRO with a length of 106mm, is 3mm shorter. Besides being longer, the Sigma 24-105mm F4 DG OS HSM also has a larger diameter of 89mm compared to the Olympus ED 7-14mm F2.8 PRO's 79mm 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. Olympus ED 7-14mm F2.8 PRO weighs 534g, 39% (351g) lighter than the Sigma 24-105mm F4 DG OS HSM's weight of 885g.
Lens Mounts
The Sigma 24-105mm F4 DG OS HSM has the Sony Alpha lens mount whereas the Olympus ED 7-14mm F2.8 PRO has the Micro Four Thirds lens mount. Some of the latest released cameras that are compatible with these mounts are Sony A99 II, Sony A68 and Sony A77 II for the Sony Alpha Mount and OM System OM-3 Astro, OM System OM-5 II and OM System OM-3 for the Micro Four Thirds Mount.
Sigma 24-105mm F4 DG OS HSM is also available in the Canon EF , Nikon F (FX) and Sigma SA mounts.
Focal Range
Sigma 24-105mm F4 DG OS HSM has a focal range of 24-105mm and
4.4X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
36 - 157.5mm.
On the other hand, the Olympus ED 7-14mm F2.8 PRO has a focal range of 7-14mm and 2.0X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 14-28mm when used on a FourThirds format camera.
