The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 135mm F1.4 and the Sigma 105mm F1.4 DG 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 135mm F1.4 is the longer of the two lenses at 138mm. The Sigma 105mm F1.4 DG HSM with a length of 132mm, is 6mm shorter. On the other hand, the Sigma 105mm F1.4 DG HSM has a larger diameter of 116mm compared to the Sigma 135mm F1.4's 112mm 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 135mm F1.4 weighs 1420g, which means it is 225g (13%) lighter than the Sigma 105mm F1.4 DG HSM which has a weight of 1645g.
Filter Threads
Both the Sigma 135mm F1.4 and the Sigma 105mm F1.4 DG HSM have the same Filter thread size of 105mm.
Below are links to the 105mm filters that we recommend you to consider for these lenses:
Lens Mounts
The Sigma 135mm F1.4 has the Sony E lens mount whereas the Sigma 105mm F1.4 DG HSM has the Canon EF lens mount. Some of the latest released cameras that are compatible with these mounts are Sony FX5, Sony A7R VI and Sony A7 V for the Sony E 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 135mm F1.4 is also available in the Leica L mount.
Sigma 105mm F1.4 DG HSM is also available in Nikon F (FX) , Sigma SA and Sony E mounts.
Focal Range
Sigma 135mm F1.4 is a prime lens with fixed focal lenght of 135mm.
On the other hand, the Sigma 105mm F1.4 DG HSM is a prime lens with fixed focal lenght of 105mm. When it is mounted on an APS-C sensor camera with 1.6x crop, it provides a 35mm (FF) equivalent of 168mm.
