I know we've dealt with this before, but as the cows come home to roost, it's worth reiterating. What is the point of using two cameras? Or three? What reasons are we dealing with here?
As I sift through tape after tape of duplicate footage, or watch people sift frustratingly through their own stuff - usually unmarked, never synched, etc etc, I have to ask why I wasn't more forceful in my dislike of the technique. It's like the {guys} who have five or six cars... or guitars... or the feminine equivalent, 100 pairs of SHOES. Now I begin to sound like Foamy the Squirrel.
The problems with two camera shoots - why you should absolutely NOT do it, are as follows:
1. Two cameras produce twice as much footage (of the same stuff) as one camera. Do you need it?
2. Keeping synch is usually unnecessary and trying to keep unnecessary synch hamstrings your creativity. It's such a triumph to get your two angles up that important stuff like asynchronous sound, or B-roll, get ingnored.
3. It's next to impossible to light well for two different camera positions simultaneously. Especially on a low budget or natural light shoot. Spend your time and effort working out either a) how to light from your chosen camera position or b) where to place the camera to best take advantage of the existing light
4. The cameras get in each others way - or worse - into each others images. Or worstest of all, the camerapersons are so intimidated they stay squished into the corner just to avoid the above traps. Result: dull and immobile images. Do you want these?
5. Unless you are using identical cameras, the resulting differences in color, contrast and saturation will make image correction an unnecessarily complicated and onerous chore.
6. Six? I haven't even paused to draw breath yet and we are already at number six! If there are at least five good reasons not to do something, you'd better have a really, really good reason to break this rule/advice/guideline.
Like what?
Like the split screen image above? Like a one-of-a-kind or ephemeral event (i.e. when you absolutely cannot retake or creatively change the angle) for example a live show, concert, sports event. Childbirth, unless you got twins, as more and more people seem to have these days. Even then, you'd notice the 'cheat' unless they were identical twins, but I digress... OK, OK... if you are planning to take down a big, public building with Semtex, I guess...
But unless you really need to do one of the above things... NEVER USE TWO CAMERAS!
There, I said it. Now I feel better.