I'm using a Canon T4i. When mirror lockup is enabled, if I press the button on the wireless remote, I have the impression that mirror lockup is not performed. Am I doing something wrong? According to the instruction manual, the only thing to do would be setting the shooting mode to timer, in which case the camera either should wait for 2 seconds (when pressing the dslr shooting button), or should shoot if the remote is used.
Once you enable the mirror lockup in the custom functions, it should wait for 2 seconds even if you use the remote. See the Manual:
If it shoots immediately, you need to set it to the 2-sec delay instead of the immediate shooting with remote. Otherwise the camera does not have time to stop vibrating after the mirror locked up. You should be able to hear the mirror lock up when you press the remote button and then again hear it expose (and unlock the mirror) once it takes the picture 2 seconds later.
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It partly depends on which wireless remote you are using. RC-1 and RC-6 are capable of shooting without a delay or after a 2 second delay. RC-5 is only capable of shooting after a 2 second delay. If you set the Drive Mode to 2 second delay they should all work the same way.
If the Drive mode is set to 2 second delay, when you press the remote button the mirror should lockup immediately, then the shutter should release after 2 seconds. If you don't feel the mirror is locking up, disable mirror lockup and see if the remote is triggering the 2 second timer. The little orange light on the front of your camera should light up to let you know the timer is counting down. If it doesn't your remote and camera are not communicating.