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As an example, careful matching of the two cameras' angles of view, angles of axis of elevation or depression, apparent lighting motivation and mood, and apparent lens heights may require some not-so-obvious consideration. Sometimes you'll find you've unwittingly created a geometrically impossible situation to match if you're not very careful.
One very common example of this sort of easily avoided error is "the very small man with the client's product box" shot. If you shoot the product first with a "conventional" product photography look-down angle, you may find the ceiling of the studio is not high enough for the height you'll now need for the actor's foreground camera. Or you'll wish you had booked that Jimmy Jib after all...
Blue painted floors get scuffed up fast enough to need touch-up or repainting fairly quickly if the crew has low discipline, or if you're making a large number of setups. If you can, it's better to go out of sequence, and move to progressively tighter shots, eliminating the need to re-paint the floor, since you'll see less of it with each new setup. (Often, a quick damp mopping will restore a dirty floor to shootable quality.) Ultimatte shoots go a little slower--some would say much slower--than a normal shoot. Allow for this.
Ultimatte In Post
In the case of scenes shot on film for eventual electronic release as commercials, for example, transfer of the film background and foreground elements to tape, and then performing the Ultimatte composite completely in the post-production phase has been a standard approach for some time. The background shot and the blue element foreground shot are easily able to be additionally manipulated in electronic post. Many effects easily achieved this way are impossible when staying completely in the film domain. Timing an Ultimatte into a post system can be a very time-consuming operation. Once done, notes on the techniques used, such a specific cabling and timing tweaks, should be kept to make the job easier the next time. The facilities' own engineer will be needed, since his expert knowledge of exactly where everything is run in the house will probably be crucially important to getting set up in reasonable time.
When your backgrounds are not even finished yet, as often is the case with computer-generated animations and graphics, Ultimatte in post will be
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