Samyang has long been recognised as a manufacturer of high quality, inexpensive and interesting lenses. The one thing missing has been autofocus, as all their lenses up until now have been manual focus only. Everything has changed with the introduction of the Samyang AF 50mm f/1.4 lens, now featuring AF and reviewed here using the Sony Alpha A7R II. Let’s see how its performance stacks up and how this first foray into AF has turned out.

Handling and Features

The lens has been specially designed for mirrorless cameras. The back focus distance is reduced to take into account the requirements of the mirrorless camera. Thus, the lens can have its rear element very close to the sensor, without having to resort to a retrofocus design to make room for the mirror box assembly on a DSLR. However, as Leica has already found, this is not quite the same advantage as a rangefinder camera with film. Especially with wider angle lenses, their rear element naturally lies very close to the sensor plane, resulting in oblique light rays from the edges. Digital sensors like telecentric designs, with light rays exiting the lens as parallel as possible, and this is not always so easy.
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https://www.ephotozine.com/article/samyang-af-50mm-f-1-4-fe-review-29618