Review on Sigma 20Mm F1 4 Lens Nikon by Maxwell Thomas

I bought this lens for a comet event then a virus happened and I just had to try it. It has soft marks on the ends even with a 4 second shot! It's hard to focus on and not keep the focus. I'll update this review after ordering another one and see if it's as good as others say. Mine was definitely defective, believe me it was off center.