The longer of the two lenses, the 50mm f/1.2 is a fast, bright lens offering a long perspective, ranging from a 75mm to 100mm equivalent focal length, depending on mount choice, that is well suited to portraiture. The combination of the longer-than-normal focal length and f/1.2 maximum aperture offers extensive control over focus placement for shallow-depth-of-field applications, and the manual focus design enables precise control over focus as close as 1.6' away. A pair of aspherical elements helps to control chromatic and comatic aberrations and an Ultra Multi-Coating has been applied to all elements to reduce flare and ghosting for increased contrast and clarity. A rounded nine-blade diaphragm further contributes to smooth bokeh quality and the front 62mm filter ring does not rotate during operation, for easier use of circular polarizers or other filters that require specific positioning.
Centre sharpness is outstanding between f/2 and f/8, with some softness evident wide open at f/1.2. At f/11 and f/16 sharpness is beginning to drop off a little. The edges aren't quite as sharp, with the best results obtained between f/4-f/8.
http://www.photographyblog.com/reviews/samyang_50mm_f1_2_as_umc_cs_review/
The lens starts off with a very high degree of sharpness centrally, with the edges not far behind. Performance is excellent from f/2.8 through to f/8, with the edges being impressively close to the central sharpness. This only starts to fall away at f/11 and f/16, with even the edges at f/16 maintaining a good level of sharpness. An impressively even lens, performing at a high level throughout.
https://www.ephotozine.com/article/samyang-50mm-f-1-2-as-umc-cs-lens-review-28370
The F1.2 aperture is what makes this lens attractive in the first place but performance wide open is not good, sharpness remains similar at F2 and F2.8 and only improves from F4. The lens peak performance is at F5.6 while from F11 sharpness decreases due to diffraction.
http://www.mirrorlessons.com/2016/08/09/samyang-rokinon-50mm-1-2-cs-review/
Rokinon 50mm f/1.2 Manual Focus Lens for Micro Four Thirds, $379 deal
Rokinon RK50M-E 50mm F1.2 AS UMC High Speed Lens for Sony , $374
https://www.amazon.com/Rokinon-RK50M-50mm-Speed-Black/dp/B015IUF8DK/
Rokinon 50mm f/1.2 Manual Focus Lens for Micro Four Thirds for $299
It looks like you're new here. If you want to get involved, click one of these buttons!