The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 150-500mm F5-6.3 and the Sigma 120-400mm F4.5-5.6 DG 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. Sigma 150-500mm F5-6.3 is the longer of the two lenses at 252mm. The Sigma 120-400mm F4.5-5.6 DG OS HSM with a length of 203mm, is 49mm shorter. Besides being longer, the Sigma 150-500mm F5-6.3 also has a larger diameter of 95mm compared to the Sigma 120-400mm F4.5-5.6 DG OS HSM's 92mm 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 120-400mm F4.5-5.6 DG OS HSM weighs 1640g, 7% (140g) lighter than the Sigma 150-500mm F5-6.3's weight of 1780g.
Filter Threads
The Sigma 150-500mm F5-6.3 has a filter size of 86mm whereas the Sigma 120-400mm F4.5-5.6 DG 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 86mm filters that we recommend you to consider for the Sigma 150-500mm F5-6.3:
And these are the 77mm filters that we recommend for the Sigma 120-400mm F4.5-5.6 DG OS HSM:
Lens Mounts
The Sigma 150-500mm F5-6.3 has the Sigma SA lens mount whereas the Sigma 120-400mm F4.5-5.6 DG OS HSM has the Canon EF lens mount. Some of the latest released cameras that are compatible with these mounts are Sigma Quattro, Sigma Quattro H and Sigma SD1 Merrill for the Sigma SA Mount and Blackmagic URSA 12K LF, Z CAM E2-F6 II 6K and Z CAM E2-S6 II 6K for the Canon EF Mount.
Sigma 150-500mm F5-6.3 is also available in the Canon EF , Nikon F (FX), Pentax KAF3 and Sony Alpha mounts.
Sigma 120-400mm F4.5-5.6 DG OS HSM is also available in Sigma SA and Nikon F (FX) mounts.
Focal Range
Sigma 150-500mm F5-6.3 has a focal range of 150-500mm and
3.3X zoom ratio .
On the other hand, the Sigma 120-400mm F4.5-5.6 DG OS HSM has a focal range of 120-400mm 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 192 - 640mm.
