The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 85mm F1.4 DG DN and the Rokinon 85mm F1.8 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. Sigma 85mm F1.4 DG DN is the longer of the two lenses at 94mm. The Rokinon 85mm F1.8 with a length of 81mm, is 13mm shorter. Besides being longer, the Sigma 85mm F1.4 DG DN also has a larger diameter of 83mm compared to the Rokinon 85mm F1.8's 68mm 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. Rokinon 85mm F1.8 weighs 344g, 45% (286g) lighter than the Sigma 85mm F1.4 DG DN 's weight of 630g.
Below you can find the dimension and weight table of the Telephoto Prime Lenses in Sony E Mount for size comparison purposes.
Telephoto Lenses in Sony E Mount for Size Comparison
Filter Threads
The Sigma 85mm F1.4 DG DN has a filter size of 77mm whereas the Rokinon 85mm F1.8 has a 62mm 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 85mm F1.4 DG DN :
And these are the 62mm filters that we recommend for the Rokinon 85mm F1.8:
Lens Mounts
Both the Sigma 85mm F1.4 DG DN and the Rokinon 85mm F1.8 has the same Sony E lens mount. Some of the latest released cameras that are compatible with the Sony E lenses are Sony A9 III, Sony A7C Mark II and Sony A7CR.
Rokinon 85mm F1.8 is also available in Canon EF-M and Fujifilm X mounts.
Focal Range
Both lenses have the same focal range of
85mm but while Sigma 85mm F1.4 DG DN has the fastest aperture of
F1.4, the Rokinon 85mm F1.8's widest aperture value is
F1.8.