found at DigiDirect
The SAMYANG AF 50mm f/1.4 - Sony FE Full Frame UMC II Mark 2 is a fast and compact normal prime lens for Sony E-mount cameras. It present several features that punch well above its class while still maintaining a small and lightweight profile.
The bright f/1.4 maximum aperture pairs with a nine-blade diaphragm to benefit selective focus and shallow depth of field imaging with smooth bokeh, making it an ideal lens for portraiture. An Ultra Multi Coating has been applied to lens elements to reduce flare and ghosting for higher contrast and colour fidelity. The optical design incorporates three High Refractive, one Extra Low Dispersion, and two Aspherical elements.
To compliment the imaging capabilities, the lens sports a customizable focus ring that can be changed to perform other functions through convenient switch located on the barrel. A Linear STM autofocus motor is used to produce quick, smooth, and quiet performance with full-time manual focus override, and a non-rotating filter, along with features like Internal AF and reduced focus breathing make it an optimal lens for video.
Optimum resolution is achieved through the 6 special glasses(2 U-ASP, 3 HR, and 1 ED) among the optical design of 11 elements in 8 groups. Combined with Sony's full-frame image sensor, this lens delivers superior sharpness and contrast in all areas of the image.
The AF 50mm F1.4 FE II uses a large-diameter aperture to provide smooth background blur. It effectively separates the subject from the background, using a shallow depth of field and adding drama to the scene. Also, it is equipped with UA(Ultra-precision Aspherical) lenses, so you can enjoy the natural and refined bokeh. Using this smooth bokeh, you can freely create photos highlighting your subject!
Tracking the subject accurately and quickly, the AF also operates quietly and smoothly when shooting video. Samyang's Linear STM (Stepping Motor) satisfies both photographers and videographers with quieter and more accurate control of the focusing lens groups.
The optical design minimizes focus breathing, which is especially advantageous for video recording. There is almost no change in the angle of view when adjusting the focus from close focus to infinity, so you can experience professional cinematic effects during shooting video with the subject moving forward or backward, or focusing from the front or back.
Pressing this button on the lens will keep the lens locked to that focusing distance. You can assign functions such as Eye AF in settings on the camera body.
There is a custom switch, which can be set to allow adjustment of the aperture silently by rotating the focus ring. Using the optional Lens Station, you can set up the mode to suit your own preference.
The minimum focusing distance is just 0.40m (1.31ft), so it is versatile and possible to produce a unique perspective close to the subject. This makes it easier to take close-up and dramatic shots of food, portraits, and nature.
The usability of the AF 50mm F1.4 FE II lens has been developed and enhanced, taking into consideration not only the design but also the user's shooting environment. It has a micro-patterned rubber focus ring, so feels great to operate and weather-sealing also protects the lens from light rain, snow, and dust. The matte finish and the subtle red ring (dependent on viewing angle) give it a modern feel.