It comes down to PURE laziness. With the number of people watching a monitor on set these days, it’s virtually impossible to have an errant mike fly by without SOMEBODY noticing it. Now, whether or not they remark upon the fact is another thing. In the old days, the Camera Operator was the ONLY Human who knew of such flaws until dailies came in. By that time, it was almost always too late do to a re-shoot.
Nowadays, if nobody remarks upon the error at the moment, it means that most of the crew either doesn’t give a damn, or loathes the Director of Photography enough to let them get sunk by their cameraman/camerawoman. It’ basically unprofessional crap, IMHO.
I notice stuff ALL the time that isn’t purely a camera department thing, and make mention of it. Nothing matters before you roll camera. And, vice versa- people stroll by and whisper stuff to me that I’ve missed incessantly. They’re looking out for my ample butt, AND for the good of the show.
Yes, digitally it can be removed. It’s all a matter of costs. Crouching Tiger knew from wayyyyy back in Pre-Production that a part of the cost of making the film was going to be a lot of digital clean-up afterwards. So be it, the film was well worth it. Here and there, on lower budget films, it’s not possible to pay for the image to be digitally cleaned up, and so one lives with the microphone in the top of the shot.
Masking during production opposed to projection is an issue only if you haven’t been careful. If you shoot with a 1:1.85 frameline- NOT a hard matte, but you monitor full frame video, you can see the evils happening JUST beyond the 1:1.85 frameline. Typically unless you’re in a very bad spot, you make sure that all bogeys are gone from the frame edges, be they seen or not.
When I cannot avoid seeing myself in reflections- as is frequently the case on MTV-Cribs that I shoot a lot of, I tell the Producer in advance. They will either nix that shot, or live with it. At least they know that it’s going to be a sort of behind-the-scenes feeling shot. Of course, Cribs is shot on videotape and therefore basically what you see is what you get, unless you have a truly lousy older t.v. set, in which case there’s some masking going on around the edges right in your own home.
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