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Or canned haze. In actual fact canned mineral oil, propane, and butane. A spray can that you can carry in your photo effects bag to create atmosphere in your shots. You've seen how Hollywood film and video producers use mist, haze, and atmosphere effects to inject visual tension in a scene - every horror shoot seems to have something boiling along the ground. In many cases it's made with water on dry ice. Good for a Transylvanian feel but the vapour created is heavier than air and tends to drop fast and disperse. The actors have to bite one another quickly while the mists roil. For a higher haze you need a different aerosol. Some have tried smoke but it can be too light, tending to drift up in spirals instead of spreading out all over the set. Unless you are prepared to torch the woods along with CALM, you may not get a wide dispersal of smoke. The answer between the two is the pressure can you see in the heading image. One of the staff members put me onto it, expecting...

The police advise you not to make eye contact with criminals. Yet we all look at politicians on the television as they give speeches. This seems somewhat of a contradiction. If you, on the other hand, are the one giving the speech, you want to be able to fix the audience with a steely and virtuous look as you make your spiel. If you have a great memory and are a good orator, you can do this. Otherwise you need to read out your speech and that means glancing away from the viewers. Not only do you break eye-contact and give them a chance to look around, but you also give the game away. Enter the teleprompter. You've seen them for decades in presidential debates and Hollywood awards ceremonies attached to complex podiums. The user is behind a glass screen but is looking out at the audience. You think they are looking at you but they are reading what their scriptwriters are sending up in a rolling script. The teleprompter is a two-way beamsplitter that lets a camera lens look through to...

Because here's where you climb over the barbed wire and stand up. We all take selfies. Even old-school shooters arrange the lights in the good old main/fill/hair pattern, attach the camera to a tripod, and attempt to take a good self portrait. It can be a wearing experience - trying to get most of the bald spots and wrinkled areas to agree with each other. ( Note: hair lights are for people with hair. Eventually they become superfluous...