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Instead, it uses a mirror to bend and redirect some of the light from the lens through an eyepiece so that the photographer is looking right through the lens itself. What you see is exactly what you get. There are enormous advantages to SLR photography. The biggest advantage is that an SLR allows you to change lenses in the camera. You can use a close-up lens, a telephoto lens, and various lenses with different aperture settings to capture just the image you want. With a viewfinder, this isn’t easy to do, because the viewfinder is made to match a particular lens and will present a much more distorted image if you change the lens.
This is a specific function lens, rather than a general purpose lens. Fish-Eye Lens A fish-eye lens is an extreme wide-angle lens that deliberately adds a spatial distortion to the picture. An image taken with a fish-eye lens can appear with the central portion (where the camera is focused) enlarged while the peripheral portions of the picture are reduced in size and clarity the further they are from the center. Unlike a picture taken with a standard wide-angle lens, the distortion with a fish-eye lens is deliberate.
What’s more, with digital photography there’s no need to worry about whether you’re using the right kind of film. You don’t need to have supplies of various speeds of film for different shooting conditions and purposes. Any type of image in any type of light can become a photo in your camera’s digital memory, provided it’s within the parameters your camera lens, aperture, and shutter speed can handle, one size fits all. Finally, digital photography allows some versatile automatic controls to be implemented for things like focusing and exposure control, some of which we’ll discuss in a bit.
Digital Satellite Equipment Control(DiSEqC)Bus Functional Specification v4.0
by Steven
4.5