Review on Rokinon Special Performance Ultra Built by Richard Cummings

Bought 2 years ago. 1 year warranty. The diaphragm is electronic. He collapsed. You try to dial in and the camera shows f2.8 but the lens is set to f22. Move the dial and the aperture changes randomly. stops where he wants. I've used dozens of lenses in my life, from brand new to vintage AF lenses. Never had this problem, don't buy it. Instead, stick with a fully manual 2.8 lens. Unfortunately. Waste of $800!