Cory, The NFL films guys use Arriflex SR2 and SR3 motion picture cameras. The "lens hoods" for these cameras are usually matte boxes (not "hoods" per se) which accept filters. Pro video guys actually usually use square hoods (but as you say sometimes circular), at least those you shoot for TV news (Betacam SP or DigiBeta pro cameras). I don't know about the lower end DV cams and others as they vary from maker to maker. As far as the "tulip" design goes, that's a fairly unique SLR lens maker design that's not used much in film and video work. Sigma was the first company I remember seeing that had that hood design.
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