On Assignment: Dealing with TV's and CRT's
I shot the CEO near a bank of TV's, and I want to take this opportunity to talk about some of the problems and solutions for dealing with the little buggars. (TV's, not CEO's.)
There are several things you have to remember when shooting TVs/CRT's, and I want to walk you through one thought process you can take when you come upon them.
The first two things you need to remember are to (a) kill the ambient, and (b) get to a shutter speed of 1/30th of a second or longer.
The ambient cannot always be controlled. But you want to get it as low as possible because the CRT's are basically light sources. The tone of the "turned off" CRT in the room's existing light is the darkest tone you will possibly be able to get for your richest black on screen when the CRT is turned on.
This is to say that, if the TV is a medium grey value in the room light, that is the deepest black you will be able to get in your lit photo of the functioning TV.
To get the ambient down, turn off the room lights if you can (duh). Also, try to shade any windows by drawing the curtains or blinds.
Once you have the TV (or computer CRT) in as dark an environment as possible, turn it on. Meter through the lens at the TV, with the picture filling the frame.
Here's where the 1/30th comes into play. Set your shutter there, because that is the fastest shutter speed that will get you a complete scan cycle of the cathode ray, which "paints" the screen about 30 times a second. That's why you get little stripes at, say, 1/125th or 1/250th. Luckily, this is not the case for most of the flat-paneled monitors we are using more and more these days. But they are dim enough where the slow shutter speed is usually gong to be used anyway.
Now that you have your shutter speed set, adjust your aperture for best exposure. If you cannot get the f/stop opened enough for a good exposure, drop to a 15th of a second. Or an 8th. You get the idea.
This full-scan, ambient light exposure will be your working exposure for the whole photo. This is why you want the turned-on TV to be the brightest thing in the room. Your subject will be darker, and you will have to adjust your flash to raise the subject to balance with the TV. Fortunately, you are not afraid of a little manual flash now and then, Right?
The last thing to remember about CRT's is that they are rounded, which means you may have to work a little creative lighting geometry to hide the flash's reflections in the screen. One tip is to stick your flash behind the monitor and shoot in profile like we did in the final shot in "Abstract Concrete," earlier.
OK, so back to The "D" Channel lady.
We got the room as dark as possible, which was "not very." This means that my blacks on the monitor were not as rich as I would have preferred. But as long as you know how to do it, that is what is important. The monitors filled the wall on the left, so I brought my Nikon SB-28 strobe (on a stand, in an umbrella) around closer to me (on the right) than I normally might have. This got rid of my flash reflections in the TV's.
The TV's were around 1/30th at 2.8 at 400 ASA, if memory serves. (This is usually about where they hit, and a good starting point for guest-imating.) The actual exposure is less important than knowing how you get there. Then I just dialed the flash down on manual, checking the TFT monitor as I went, until she looked balanced.
I know this sounds like a lot if you are new to it, but it really is not. Here it is again, in a nutshell:
1) Get the room as dark as possible.
2) Using 1/30th as your maximum shutter speed, get your exposure, based on the TV screen - right through the lens.
3) Adjust your flash to balance the subject.
4) Angle your flash to avoid TV reflections.
Computers (and TV screens) are a fact of life, and hardly a week goes by that I do not have to shoot someone in that environment.
Learn to do it well, and never worry about it again.
Photo ©David Hobby / Baltimore Sun
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