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"Why are TV Cameras still huge and expensive?"
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All good cameras are still huge and expensive. We got shitty cameras in our phones but since we stopped using proper cameras we forgot how bad they are compared to the real stuff.
He's not talking in comparison to shitty phone cameras, but in comparison to DSLR type cameras, why they are not good enough for broadcast TV.
DSLRs just don't have the types of lenses and a ton of electronics and features that are in broadcast cameras. Broadcast cameras have things like 3-CCD sensors, built-in variable ND filters, reference/sync inputs, multiple video outputs (clean, pix) over SDI or SMPTE 2110 or connectivity to a CCU (camera control unit). They'll often support intercoms and return video for the camera operator or for teleprompting. Source: am broadcast engineer.