Lack of lighting when shooting video. video art

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Lack of lighting when shooting video

video art

A very common problem for operators is the lack of light. Many cameras in low light produce a fuzzy, noisy (grainy) picture, which simply cannot please.

Some manufacturers write that their cameras can shoot in low light (with a burning candle), cameras, of course, can shoot in these conditions, but the quality makes you expect better.

It is impossible to get a decent image of a scene lit by candles from the camera in auto control mode. Therefore, it is desirable to have manual settings for your camera, at least the aperture.

When you experiment with adjusting the aperture, when you open it, the indicator will show the transition from F8 to F4 and F2. The OPEN indicator in the viewfinder will then light up. In this state, the diaphragm is fully open and maximum light flux passes through the lens.

Further opening of the diaphragm is conditional, in fact, further occurs, amplification of the electrical signal received by the CCD matrix. The gain level meter will show a change from +3 to +18 dB.

And as practice shows, any forced increase in the signal makes the picture noisy.

The more gain, the more noise.

If the camcorder is left to the mercy of the automatic regulator, it will open the aperture to failure and set the gain to +18 dB, trying to turn the candlelit scene into a sunlit lawn. As a result, a complete set of noise is guaranteed, and the image will look worse than on VHS after the 5th rewrite.

The question is how to deal with it? Of course, some cameras have relatively good modes that allow you to ensure a minimum level of noise. Such as Twilight Mode (twilight). This sets the shutter speed to 1/60s and the gain is capped at +6dB. Similar modes are available in other camcorders. In low (but not too) light conditions, Twilight Mode provides good results with a minimum of effort. But despite this, in many cases at low light levels you will still have to control the camera manually.

What should be done. First, you should set the shutter speed to 1/60s or 1/30s. Secondly, try to raise the gain to a level where the picture is already satisfactory, and the noise level is still acceptable.

The main thing is not to overdo it, gain above +9 dB is undesirable; Shutter speeds slower than 1/30 s should only be used when you or your subject are not going to make fast movements, such as panning the camera, running. Otherwise, a stroboscopic effect will result.

In any conditions with manual control, the noise level is always much lower and the details are more clearly drawn, unless, of course, you know how to control your camcorder well.

Tiny video camera viewfinders, even with color LCD displays, will not be able to show all the shortcomings due to their low resolution. If you have a portable TV at your location, you can fine-tune all camera settings and see what you are actually recording on film.

Also, to improve the illumination, you can simply add light to the frame. Try to connect a few additional lighting fixtures to work.

Illuminate the scene from behind or from the side with a light fixture, if you are shooting by candlelight or the sun, put a dark blue filter in the form of a translucent fabric or blue glass on the lamp. Because ordinary incandescent lamps have a different color temperature: 3200K (appliances with incandescent lamps) and 5400K (natural daylight)

For example: a white wall illuminated from one end by an incandescent lamp and from the other by a candle on the video camera monitor will look yellow and blue, although the wall is white.

Publication: video-lighting-notes.blogspot.com

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