The Viltrox AF 85mm F1.8 STM is the first full-frame autofocus lens from Viltrox designed for Sony E-Mount Camera Prime Lens. A short-telephoto well-suited to portraiture, the Sony E PFU RBMH 85mm f/1.8 STM from Viltrox is also characterized by its bright f/1.8 maximum aperture, which excels in difficult lighting as well as benefits working with shallow depth of field techniques.
The optical design comprises one extra-low dispersion element, along with four elements made from highly transparent glass, that aids in reducing chromatic and spherical aberrations in order to realize high clarity and sharpness. An HD Nano multi-layer coating has also been applied to suppress flare and ghosting for improved contrast when working in strong lighting conditions.
Additionally, the lens features an STM motor for quick, quiet autofocus performance along with a minimum focusing distance of 2.6′ for working with close-up subjects. The new Viltrox PFU RBMH 85mm f/1.8 STM is designed for Sony’s full-frame mirrorless FE mount cameras like the Sony A7 III and undercuts the price of Sony’s own 85mm f/1.8 portrait lens by around 40%. It can also be used on Sony’s APS-C mirrorless cameras like the A6400, where it has an effective focal length of around 128mm.
Viltrox makes a wide range of photographic accessories including LED panels, extension tubes, lens adaptors and more, but it only branched out into lens manufacture in October 2018, with the launch of three new lenses: an 85mm f/1.8 MF lens for Sony cameras, an AF version for Fujifilm X- mount and a manual focus 20mm f/1.8 prime for the Sony mount.
The new 85mm lens offers STM (stepping motor) autofocus capability, whereas the previous Sony-fit Viltrox 85mm f/1.8 lens was manual focus only. Other specs include an aperture range of f/1.8-f/16, an optical construction of 10 elements in 7 groups and one extra-low dispersion lens element. Viltrox’s own HD Nano multi-layer lens coatings are used to combat flare.