The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 70-200mm F2.8 EX DG HSM II and the Olympus ED 90-250mm f2.8 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 90-250mm f2.8 is the longer of the two lenses at 276mm. The Sigma 70-200mm F2.8 EX DG HSM II with a length of 184mm, is 92mm shorter. Besides being longer, the Olympus ED 90-250mm f2.8 also has a larger diameter of 124mm compared to the Sigma 70-200mm F2.8 EX DG HSM II's 87mm 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 70-200mm F2.8 EX DG HSM II weighs 1390g, which means it is 1880g (57%) lighter than the Olympus ED 90-250mm f2.8 which has a weight of 3270g.
Filter Threads
The Sigma 70-200mm F2.8 EX DG HSM II has a filter size of 77mm whereas the Olympus ED 90-250mm f2.8 has a 105mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 77mm filters that we recommend you to consider for the Sigma 70-200mm F2.8 EX DG HSM II:
And these are the 105mm filters that we recommend for the Olympus ED 90-250mm f2.8:
Lens Mounts
Both the Sigma 70-200mm F2.8 EX DG HSM II and the Olympus ED 90-250mm f2.8 has the same Four Thirds lens mount. Some of the latest released cameras that are compatible with the Four Thirds lenses are Olympus E-5, Olympus E-600 and Olympus E-620.
Sigma 70-200mm F2.8 EX DG HSM II is also available in Canon EF , Pentax KAF3, Sony Alpha, Sigma SA and Nikon F (FX) mounts.
Focal Range
Sigma 70-200mm F2.8 EX DG HSM II has a focal range of 70-200mm and
2.9X zoom ratio .
On the other hand, the Olympus ED 90-250mm f2.8 has a focal range of 90-250mm and 2.8X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 180-500mm when used on a FourThirds format camera.