Steve Perry wrote:
I had to go through 3 copies before I found a sharp one (I later found that the folks at Photography Life has similar problems). However, this was all when the lens first came out. I really don't see too much anymore about sample variation, it seems like it's pretty safe to buy now. Of course, always test any new lens and make sure it's satisfactory.
Steve, besides going out and using it, do you have a video on how to test your lens?