The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Samyang 135mm F2.0 ED UMC and the Sigma 135mm F1.8 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. Samyang 135mm F2.0 ED UMC is the longer of the two lenses at 122mm. The Sigma 135mm F1.8 DG HSM with a length of 115mm, is 7mm shorter. On the other hand, the Sigma 135mm F1.8 DG HSM has a larger diameter of 91mm compared to the Samyang 135mm F2.0 ED UMC's 82mm diameter.
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Below you can find a scaled side-by-side image of Samyang 135mm F2.0 ED UMC and Sigma 135mm F1.8 DG HSM to get a better idea of how their sizes compare in real life.
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. Samyang 135mm F2.0 ED UMC weighs 830g, which means it is 300g (26%) lighter than the Sigma 135mm F1.8 DG HSM which has a weight of 1130g.
Below you can find the dimension and weight table of the Telephoto Prime Lenses in Canon EF Mount for size comparison purposes.
Telephoto Lenses in Canon EF Mount for Size Comparison
Filter Threads
The Samyang 135mm F2.0 ED UMC has a filter size of 77mm whereas the Sigma 135mm F1.8 DG HSM has a 82mm 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 Samyang 135mm F2.0 ED UMC:
And these are the 82mm filters that we recommend for the Sigma 135mm F1.8 DG HSM:
Lens Mounts
Both the Samyang 135mm F2.0 ED UMC and the Sigma 135mm F1.8 DG HSM 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.
Samyang 135mm F2.0 ED UMC is also available in Canon EF-M , Four Thirds, Fujifilm X, Micro Four Thirds, Nikon F (FX), Pentax KAF, Samsung NX, Sony Alpha and Sony E mounts.
Sigma 135mm F1.8 DG HSM is also available in Sigma SA , Nikon F (FX) and Sony E mounts.
Focal Range
Both lenses have the same focal range of
135mm but while Samyang 135mm F2.0 ED UMC has the fastest aperture of
F2, the Sigma 135mm F1.8 DG HSM's widest aperture value is
F1.8.