Those were descended from, but different from Betamax.
BetaCam SP, DigiBeta and HDCAM are all still used, and while the original BetaCam cassette (which was used long after Betamax lost the format war) was technically compatible with Betamax tapes, it was discouraged because the BetaCam tapes were higher specced to be able to run faster (the signal was quite different, and much higher quality than Betamax).
Comments
Those were descended from, but different from Betamax.
BetaCam SP, DigiBeta and HDCAM are all still used, and while the original BetaCam cassette (which was used long after Betamax lost the format war) was technically compatible with Betamax tapes, it was discouraged because the BetaCam tapes were higher specced to be able to run faster (the signal was quite different, and much higher quality than Betamax).