Review on Rokinon Special Performance Ultra Built by Adam Webbie

I use this lens with a 5D Mark IV and it's a great combination for astrophotography. It's manual focus only so you need to know what you're doing, it's not a beginner's lens but it's not difficult to master. The focus ring is smooth. The sharpness is excellent in my opinion. Coma Control is one of the best astro lenses you can buy. My first copy had a decentering issue that is well known with Rokinon lenses and when I called they tried to find a way to disqualify me for a replacement. I definitely didn't feel that their customer service was very good. But they ended up replacing it and my new one works great. I want you to put a filter on the front to protect them, but if you take good care of your lenses you can keep them looking pristine for years. The lens is highly recommended.