For the people who don't know what light trails are:
Light trails are the, well, trails of light you see in dark, night-time photos of for example the lights of cars.
Since then I had to know how to take those kinds of photographs. So I started looking online and asking friends at college who are also into photography.
I figured out that when you have the shutter speed set to a really high number, the camera will basically record for the amount of seconds you have set the shutter speed to. That's also why in low-lit areas, some photos might look smudgy without a tripod. (This is basically because the camera will have set a longer shutter speed to get more light on the chip.) Then when you set the aperture to a number like f/22, which means that there will barely get any light through the lens to the chip, you will in the right place, get this effect.
The long shutter speed will result in lots of light on the chip, but the low aperture will result in not much light coming through anyway. With these settings you will get these light trails but not actually having lots of overexposure. The ISO will usually be set to a low number like 100, 200 to avoid overexposure and what's even more important: no, or a minimum amount of noise.
You'll have to play with these three settings to get the photo you want. over- and underexposure can look good but you'll have to be aware of these, especially with light trails, since they can really mess up the photo.
Here's a photo I took from the top of a friend's apartment of a junction in the middle of the city.
Tell me what you think about this photo or the subject: Light trails, in the comment section.
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