Lens Performance, Getting the Most from a Lens

  Camera motion causes blur. Though some photographers claim to be able to hand hold a camera steady at slow shutter speeds-V” sec. or even slower-it takes only a slight amount of camera motion during exposure to cause a noticeable blur in an image. If a sharp picture is your aim, using a fast shutter speed or supporting the camera on a tripod is a much surer way to produce an image that will be sharp when enlarged. … PDF: Lens Performance Getting the Most from a Lens

Single-Lens Reflex (SLR) Camera

The 35mm Single Lens Reflex (SLR) camera is fundamentally a 45° hinged mirror set behind a lens which reflects the image up to a focusing screen on the camera top. As the shutter release is pressed the mirror flips up to: i) Form a seal under the focusing screen to prevent light from entering the camera through the viewing lens. ii) Move out of the way of the lens and film. When the mirror reaches the horizontal position it fires a focal plane shutter just in front of the film to make an exposure. Distances are arranged so that the Read more