I agree that 3rd limited (also called '3rd subjective') is the most common novelistic technique, and this generally means that one must stay in tight POV of a single character for each scene.
HOWEVER, I should note that there are certain ways that convention allows writers to bend the rules of 3rd limited into what is a kind of temporary omniscience. One is in openings (either of chapters, or of the book as a whole), where the scene is set. This is the equivalent of a wide-view shot in film. "For millions of years, the elephant seals had returned to Afton Island to battle and breed, and..." In this kind of scene set-up, the focus moves from an objective narrator and then zooms in, either slowly or rapidly, into the POV of the character--and the POV character may know nothing whasoever of the history of Afton Island or of elephant seals.
The other time one sees 3rd limited violated without any complaints is when there is a brief passage that can't be from any characters point of view. "High on the slopes of K-2, an outcropping had gathered its annual burden of snow, but a freakish warm wind from the valley below had..." or "Deep on the seabed below, the rusted pressure vessel had already begun to leak spewing out a stream of..." A purist may not like such things, but they are widely accepted, especially in thrillers and techno-suspense, that are otherwise strictly 3rd limited.
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"The third-person-subjective point of view has its uses, but it also has severe limits, so that something is wrong when it becomes the dominant point of view in fiction, as it has been for years in the United States."
John Gardner, "The Art of Fiction," 1983