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Message: <blockquote data-quote="hark" data-source="post: 639117" data-attributes="member: 13196"><p>If your 50mm works fine during the daytime when lots of light is present, then it isn't the lens. There needs to be some light available in low light situations for a lens to focus. When light is low, you need to focus on something that has a lot of contrast (such as an edge that separates something lighter from something darker). If there isn't any contrast where you are focusing, then most likely that's the problem. I've had that problem myself when using my 70-200mm f/2.8 during daytime Worship services. There's plenty of light to the naked eye, but I wind up having to focus on something else to lock focus.</p></blockquote><p></p>