By Jack Kennedy
 Most of the time, every telephone line will be equipped with a DSL filter and only the cable connection will be left without it. Installed on the telephone lines or some other type of analog device, a DSL filter ensures outside interference is prevented when DSL services are functioning on one line. Without this the connection can have major performance problems.
Many people split the telephone line keeping one line for the DSL modem and the other for the telephone and fax machine.
There are many devices with specific uses, such as special telephones for the deaf, that are not functional with a DSL filter. For these situations, a separate line will need to be installed.
How It Works
With the DSL filter installed, the analog low pass filter will ensure that the signals are not interfered with by any outside noise or higher frequency signals. Without this filter, you will experience connectivity problems, and possibly a buffer sound and gurgling noises in the background. This problem can be avoided when the telephone wires and the DSL modem line are separated. |
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By Alex Tabony
 Taking good pictures in low light can be achieved in a number of ways. To maintain a proper exposure you may need to increase aperture, reduce shutter speed, use higher ISO or use a flash just as with a film camera. However with digital photography there are additional considerations.
Opening the aperture (lower F-numbers) opens the lens' internal blades that restrict light from entering the camera. By letting more light in, you can obtain a good exposure while keeping other camera settings the same. The two things to consider when using a reduced f-number, is the reduction of depth of field and that most lenses do not perform as well at their widest apertures.
Lowering shutter speed without making other adjustments can also help in getting the proper exposure. The rule of thumb is to set shutter time to no less than the focal length of your lens. So if you are using a 50mm lens, you should generally try to keep the shutter speed above 1/50 of a second. This will help prevent blurring the image due to camera shake (tripod can help).
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