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Samyang and Rokinon are DEFINITELY no good at quality control. I've not only experienced it with a new lens, I've read so much about the inability of many of their lenses to obtain focus at infinity.
Unfortunately I have an 85mm f1.4 I bought used from eBay and when I couldn't achieve focus at infinity the seller told me I had to use live view and p*ssed in my ear about how to obtain focus via some setting I knew nothing about because I didn't have live view and he knew that.
I should have returned it for an immediate full refund. It may focus stopped down to f4 or f5.6 but that's not why I bought an f1.4 lens.....
Yep, but new, return if focus can not be achieved at infinity.
I got my new 14mm f2.8 ED replaced immediately, the new one will achieve good focus but it's nowhere near the infinity mark on the lens and it's considerable fidgeting to obtain focus. I now have a red nail polish mark on the focus ring where infinity is sharp for astro. I spent hours out adjusting, running inside to look at the image on a screen I can actually see and back out to adjust focus again, and again, and again.. Four hours in one night running in and out after every 2 or 3 shots to see where it was closest.
Don't ask me about my new PK lens to Nikon F mount adapter from K&F with the glass element, it's a nightmare, infinity is at around 3 feet on the scale and far from clear. It works with a lens locked on macro at 80mm but nothing else and I have several old Pentax lenses, PK and M42.
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