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Message: <blockquote data-quote="aroy" data-source="post: 580242" data-attributes="member: 16090">In certain lighting especially low light and low contrast the camera may not acquire focus and thus refuse to fire. I have faced it a lot of times with my D3300, where an image is seeming perfectly in focus but the camera refuses to fire. Here are some situations. Object is too near, especially when using an on-board flash. There is a minimum distance for the flash.. The contrast is very low for AF to function.. You are trying to focus on a flower, but the background clutter prevents the focus acquisition, this is especially true when the image is around the size of the focus rectangle.. The light is either too high or too low. This happens especially when using fixed ISO</blockquote>