The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sirui 85mm F1.4 X and the Viltrox AF 85mm f1.8 XF II 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. Sirui 85mm F1.4 X is the longer of the two lenses at 102mm. The Viltrox AF 85mm f1.8 XF II with a length of 92mm, is 10mm shorter. On the other hand, there is no difference between the max diameters of these lenses, both coming at 80mm.
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. Viltrox AF 85mm f1.8 XF II weighs 484g, 10% (56g) lighter than the Sirui 85mm F1.4 X's weight of 540g.
Below you can find the dimension and weight table of the Telephoto Prime Lenses in Fujifilm X Mount for size comparison purposes.
Telephoto Lenses in Fujifilm X Mount for Size Comparison
Filter Threads
The Sirui 85mm F1.4 X has a filter size of 67mm whereas the Viltrox AF 85mm f1.8 XF II has a 72mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 67mm filters that we recommend you to consider for the Sirui 85mm F1.4 X:
And these are the 72mm filters that we recommend for the Viltrox AF 85mm f1.8 XF II:
Lens Mounts
Both the Sirui 85mm F1.4 X and the Viltrox AF 85mm f1.8 XF II has the same Fujifilm X lens mount. Some of the latest released cameras that are compatible with the Fujifilm X lenses are Fujifilm X-T30 III, Fujifilm X-E5 and Fujifilm X-M5.
Focal Range
Both lenses have the same focal range of
85mm but while Sirui 85mm F1.4 X has the fastest aperture of
F1.4, the Viltrox AF 85mm f1.8 XF II's widest aperture value is
F1.8.
