I'm sending a replacement for the first one I ordered a few weeks ago. Both show strong vignetting with color degradation in the corners. I spent too much time trying to fix the problem in Lightroom. Not worth it, and certainly not worth the 600.2 stars for very good sharpness in the center, but quickly decreases towards the edges. Finally, do not use the Samyang lens back cover on other E-mount lenses. To remove it you need 2 people and a boy. I thought I would have to break it. Serious. But that doesn't bother me anymore since the lenses are coming back.
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