Canon has a dedicated Mirror Lock Up feature in the custom menu so really there is no need to place it into live view mode. This though may have change in some models. Typically you press the shutter button once to lock mirror up and press again to shoot image.
It's easier handling using Liveview insted of the mirror-prerelease.
As I said : it's just one button: the center one, then your mirror is up and the Liveview activated.
The only issue: it uses more energy, so your batterie does not last as without Liveview.
Without Liveview app. 800 images, with app. 300.
It depends on your time to shoot, might be longer if you are faster.
OK, I understand the method. I think this would also work OK with the Nikon because the Nikon D300 doesn't have the dedicated mirror lock up feature (which is one of it's few down falls) but my preferred way is with the custom function on the Canon. In the end that same result so all is good.
Hi Smooth,
I will have a look at your mentioned function - it may save a lot of batterie though.
Wonder what will happen, when you activate the mirror-look-up AND Liveview.
edit:
I just tried it.
If you activate "Mirror-Lookup" Liveview behaves just as ever.
The main difference is, that the"Mirror Lookup" (Prerelease would the the right translation from German -> English) makes MUCH MORE VIBRATION !!!! than the Liveview!
When using "Prerelease" there is remakable shaking when the mirror swings up - you have to wait about 3-5 sec- then press the release again and the image is taken. The mirror siwngs back again after each single shot.
Liveview is different here: the mirror is kept open - so you don't have to wait and also you just press the release once.
As mentioned, the only issue is the increase in energy-consumption.
I dont think that it is a big issue that Nikon just "elimated" the "Mirror Lookup". Liveview is much more convenient.