Lenses (Cambridge In Color)

Lenses

Source = Cambridge in Colour/Lenses

• The Use of Camera Lenses allows more creative control to youre shot

• The Use of a certain Lens can allow you to control the direction of "the path of light rays to recreate the image as accurately as possible on the digital sensor."

• This can be use to minimise aberrations

• An Optical aberration occurs when "points in the image do not translate back onto single points after passing through the lens"

• This can cause image blurring, reduced contrast or misalignment of colors.

• A focal length of a lens determines its angle of view, allowing an image to be magnified.

• Focal Length can determine the perspective of an image, but also we should note perspective only changes with one's location relative to their subject.

• A wide angle lens exaggerates or stretches perspective, whereas the telephoto lens compresses or flattens perspective.

• Perspectice Control is a useful way of compositing youre shots.

• "Other factors may also be influenced by lens focal length."

• A wide angle Lens is generally more resostant to flare.

• " Longer focal lengths require shorter exposure times to minimize blurring caused by shaky hands"

• This is because "slight rotational vibrations are magnified greatly with distance, whereas if only up and down or side to side vibrations were present, the laser's bright spot would not change with distance."

• For a 35mm camera, "the exposure time needs to be at least as fast as one over the focal length in seconds."

• Otherwise blurring could become a problem.

• A Zoom Lens best for differing with the focal length.

• But bare in mind the zoom allows you simply more flexibility with youre shot.