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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.

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Not that this is very helpful but while using the 2-second delay on my remote shutter release, i found that the mirror did in fact lock-up i just missed it. Previously i had thought my mirror would not lock either, thank you for your help –  user22769 Oct 18 '13 at 13:52

2 Answers 2

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:

With Remote Controller RC-6 (sold separately) set to a 2-sec. delay, press the transmit button and the mirror will lockup before the picture is taken 2 sec. later.

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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I have an RC-6. If I set to 2-sec delay, the remote does not work. As per instruction manual, only the "10sec/remote" option can be used and I really don't think the mirror is brought up before shooting. –  Bob Jan 30 '13 at 2:52
If you test it with 10 seconds, you can find out if the mirror locks up by looking into the viewfinder. If you can see out through the lens, it does not lock up. Also: Are you sure you activated the mirror lockup in the custom functions? –  uncovery Jan 30 '13 at 3:12
yes, I enabled the feature. the remote can only be used when selecting the option "timer/remote" and I don't think the RC-6 locks up the mirror when I press the button. If I press the button on the DSLR, the mirror does lock up. –  Bob Jan 31 '13 at 2:07
If you keep the camera in front of you when you press the remote button, you should see if the mirror locks up. There should be no room for "I think / do not think so". –  uncovery Jan 31 '13 at 2:29
why would the dslr take the photo immediately then? it would wait for 2 sec don't you think? –  Bob Feb 1 '13 at 3:50

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.

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The mirror lockup does not work without the 2sec delay. Since all remotes support the 2sec delay, it does not matter which one you use for mirror lockup. –  uncovery Jan 29 '13 at 8:48
is this a known T4i issue? or do I need to buy a different remote? –  Bob Jan 30 '13 at 2:53

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