The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 70-300mm F4-5.6 DG OS and the Canon 90-300mm f4.5-5.6 USM 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 70-300mm F4-5.6 DG OS is the longer of the two lenses at 126mm. The Canon 90-300mm f4.5-5.6 USM with a length of 115mm, is 11mm shorter. Besides being longer, the Sigma 70-300mm F4-5.6 DG OS also has a larger diameter of 77mm compared to the Canon 90-300mm f4.5-5.6 USM's 71mm 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. Canon 90-300mm f4.5-5.6 USM weighs 420g, 31% (190g) lighter than the Sigma 70-300mm F4-5.6 DG OS's weight of 610g.
Below you can find the dimension and weight table of the Telephoto Zoom Lenses in Canon EF Mount for size comparison purposes.
Telephoto Lenses in Canon EF Mount for Size Comparison
Filter Threads
Both the Sigma 70-300mm F4-5.6 DG OS and the Canon 90-300mm f4.5-5.6 USM have the same Filter thread size of 58mm.
Below are links to the 58mm filters that we recommend you to consider for these lenses:
Lens Mounts
Both the Sigma 70-300mm F4-5.6 DG OS and the Canon 90-300mm f4.5-5.6 USM has the same Canon EF lens mount. Some of the latest released cameras that are compatible with the Canon EF lenses are Canon 1D X III, Canon 6D MII and Canon 5D MIV.
Sigma 70-300mm F4-5.6 DG OS is also available in Nikon F (FX) , Pentax KAF3, Sony Alpha and Sigma SA mounts.
Focal Range
Sigma 70-300mm F4-5.6 DG OS has a focal range of 70-300mm and
4.3X zoom ratio . When it is mounted on an APS-C sensor camera with 1.6x crop, it provides a 35mm (FF) equivalent of
112 - 480mm.
On the other hand, the Canon 90-300mm f4.5-5.6 USM has a focal range of 90-300mm and 3.3X zoom ratio . When it is mounted on an APS-C sensor camera with 1.6x crop, it provides a 35mm (FF) equivalent of 144 - 480mm.