The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 10-20mm F4-5.6 EX DC HSM and the Olympus ED 7-14mm f4.0 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. Olympus ED 7-14mm f4.0 is the longer of the two lenses at 120mm. The Sigma 10-20mm F4-5.6 EX DC HSM with a length of 81mm, is 39mm shorter. Besides being longer, the Olympus ED 7-14mm f4.0 also has a larger diameter of 87mm compared to the Sigma 10-20mm F4-5.6 EX DC 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 10-20mm F4-5.6 EX DC HSM weighs 470g, which means it is 310g (39%) lighter than the Olympus ED 7-14mm f4.0 which has a weight of 780g.
Below you can find the dimension and weight table of the Wideangle Zoom Lenses in Four Thirds Mount for size comparison purposes.
Ultra-Wideangle Lenses in Four Thirds Mount for Size Comparison
Lens Mounts
Both the Sigma 10-20mm F4-5.6 EX DC HSM and the Olympus ED 7-14mm f4.0 has the same Four Thirds lens mount. Some of the latest released cameras that are compatible with the Four Thirds lenses are , and .
Sigma 10-20mm F4-5.6 EX DC HSM is also available in Canon EF , Pentax KAF, Sony Alpha, Sigma SA and Nikon F (DX) mounts.
Focal Range
Sigma 10-20mm F4-5.6 EX DC HSM has a focal range of 10-20mm and
2.0X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of
15-30mm when used on a APS-C / DX format camera.
On the other hand, the Olympus ED 7-14mm f4.0 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.