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Typically you'd only use this mode with a remote release and a tripod.

One press of the button makes the mirror swing up (you would normally pause a moment) and the second press of the button makes the shutter release. The mode is intended for situations where the vibration induced by the mirror swinging up may blur the shot. There's also a custom mode in which you have to press the shutter button twice to get the camera to take a shot. I just want to confirm that you do have a card installed and the camera believes there is a card installed. The camera wont take a shot if it does not believe there's a memory card in the camera - but it should also give you an error message that there's no card. There are a few other things which are a bit more obscure and/or a bit more obvious. You can test by checking the camera outdoors during the daytime when there's plenty of available light. even if it believes it was not able to focus.)ģ) Are you in a situation with very low light? The camera may give up attempting to focus if the lighting is not adequate to lock focus. You can override this by switching off auto-focus (go to manual focus on the lens) or by switching to "AI Servo" mode (which changes the behavior to "Release Priority" whcih means the camera will take the shot when the shutter button is fully pressed. If you are in "One Shot" mode and in poor lighting, the camera may simply refuse to take a shot. it's not set for the 10 second timer?).Ģ) If you are in "One Shot" mode, the camera will default to "Focus Priority" which means it will refuse to take a shot if it cannot confirm that the camera was able to lock focus on at least one focus point. 1) Have you verified that the camera isn't in a timed delay mode (e.g.