
Originally Posted by
David Mullen ASC
I don't believe in that -- the point of making a movie is to tell a story well, not to automatically maintain lighting continuity. That's a technical issue that shouldn't supercede creative issues. Audiences don't go to movies to see perfect lighting continuity, they go to see a captivating story or because they like a certain movie star, whatever.
There are two reasons why you might change the lighting when you move in closer, though the intent is to not be obvious about it.
One, the positions of the lights in the wide shot may have been compromised in order to stay out of a complex moving shot -- in other words, you couldn't quite light the room the way you wanted to because of the camera move, meaning that some of the lighting unit positions were merely chosen because there was nowhere else to put them that was out of the shot, so you rely on the tighter coverage to fix any mistakes in the look caused by this compromising, especially if you are attempting to simulate natural sources.
Two, when you change shot size significantly enough, you change the level of information that the audience is seeing. In a wide shot, a high light (which may be so high in order to get out of the camera's view) may produce unattractive bags under the actor's eyes or not enough light in the actor's eyes, or make a scar or fold in the skin stand out... but in a wide shot, the defect isn't noticable. In a close-up, it may become very distracting for the viewer, so you adjust the light, maybe lowering it a little or softening it a little, things you couldn't do in the wide shot because there was no room. You wouldn't leave the distracting bit of ugly light on the face just to mechanically maintain lighting continuity. That's like saying you can never adjust the positon of props and furniture in the frame to get a better compositon in the tighter angles, that everything must stay exactly where it was even if it makes a boring composition, or a distracting one.
In other words, NOT cheating the lighting or the positions of things in the frame may actually produce a shot that looks like a mistake, even though it actually matches the widest shot perfectly. It may throw the viewer out of the movie rather than drawing them into the movie.
Also, sometimes directors are in a hurry to shoot, so the DP will light the set only as good as it needs to be for a wide shot. But if he knew that the lighting also had to be good for tight details that weren't visible in the wide shot, they may take more time lighting the wide shot, and have to resort to elaboarate rigs to hide and mount that extra light -- when if they could have just fixed it for the closer angle only, the solution may have been very simple and fast, like bringing in a small eyelight to clean out the bags under the eyes.
Continuity is a tool like anything else in a movie... and you use it when it benefits the scene and you manipulate it or ignore it when doing that instead would make the scene better. We're talking about narrative fiction here, not a cinema verite documentary where changing the location through lighting or adjusting the furniture may be construed as "dishonest".
The trick with cheating is just to maintain the feeling of the wider shots in terms of mood, contrast, color, direction of light, while adjusting it to benefit the subject in the frame and the story point you're trying to make.
If you can light a wide shot of a room perfectly so that all closer angles can be taken without making a change, obviously that would be ideal, but it doesn't always happen.
What if the director wants a character's face to look like it is being lit by the flickering light of a TV set in a dark room, and wants to dolly 180 degrees in an arc, showing the TV set and then the actor sitting in a medium shot? In the wide shot, you may hide a small light behind the TV set or a piece of furniture to suggest the key from the TV set, but it may be too hard and projected-looking to be completely believable. IF you have a chance to shoot a close-up of the actor, you may wish to bring in some softer lighting rig that more accurately creates the effect of the flickering glow from the TV set, but this rig would not have fit in the room in the wide shot.
And what if the point of your film was to create a romantic ambience where the lead actors look stunningly beautiful in their close-ups? And what if you had to cast actors who were attractive but not quite as glamorous as the scene required? Or perhaps this is a flashback and the 40-something lead actors are having to play themselves as 20-something college students, so careful close-up lighting is needed to hide the real years visible on their face? It would be self-defeating to your own project to insist that the lighting in their close-ups had to be the wide master shot lighting with no changes, if the end result was that they didn't look convincingly younger for the scene.