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Samyang and Rokinon are pretty much the same company with different names. They have the manufacturers so there would be no difference in choosing one brand over the other.

I have the Rokinon 50mm  F1.4 and the AutoFocus is barely usable especially in AF-C. My lens isn't update so that maybe the reason. I wouldn't buy it unless it's updated or if you are planning to get the Lens Station for future updates.

The colors on the Rokinon were a little weird to me too. The photos come out slightly more yellowish/orange and sometimes acts up even with a color checker passport.

All in all, if you're interested in third party lenses, I'd look at Sigma because image quality, detail, distortion, and colors are far better than Rokinon and Samyang.

 

Hope this helps!

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