Samyang has released a 24–70mm F2.8 autofocus (AF) lens for Sony E mount camera systems.
The lens is constructed of 17 elements in 14 groups, including two aspherical elements, three high-refractive elements, three extra-low dispersion elements and a single ‘HB’ element. One element also features Samyang’s UMB coating for reduced ghosting and flares. Other features include a nine-blade aperture diaphragm, an aperture range of F2.8 through F22, a minimum focusing distance of 35cm (1.15ft) and an 82mm front filter thread.
As with other Samyang AF lenses, this 24–70mm F2.8 lens uses the company’s linear stepping motor (STM) autofocus system. What’s unique about this lens, however, is that it’s parfocal, meaning once the focus is set, changing the focal length of the lens won’t affect the focus point, due to the elements inside compensating accordingly. This kind of feature is most often seen in more expensive cinema lenses, as it prevents the need to rack focus when you’re zooming in on a subject.
The lens is weather-sealed and features a customizable sliding switch on the barrel that can turn the focus ring into an aperture ring with a quick flip of the switch. Below is a single sample photo, allegedly taken with the lens, according to the product page.
