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Message: <blockquote data-quote="eurotrash" data-source="post: 105814" data-attributes="member: 9237">So my Sigma 40mm 1.4 is lovely. I really do love it. It's awesome in the daylight, even at 1.4 all the way up to wherever I wish to use it..But it seems that at night, it doesn't like focusing on what I want it to. It'll wander around, grabbing what seems to be random things and choosing to focus on them by it's own volition. Has anyone experienced this? How can I accurately test what this thing is doing?I've calibrated it using that 45 degree test chart at 1.4, but I think that might be throwing things off. I didn't know that was possible.</blockquote>