Learning Event 6:
DESCRIBE THE CAUSE AND THE CORRECTION OF LENS
1. Optical Flare primarily caused by unwanted light rays striking the lens
surface and the internal reflections from the glass-to-air surfaces of the
lens elements. This will reduce the quality of image sharpness (fig 1-16).
Figure 1-16.
Optical flare
2. Optical Flare can be greatly reduced or eliminated by the use of a lens
hood or a lens shade.
A lens hood or lens shade is a tubular attachment
that is mounted on the lens. It shades the surface of the lens by blocking
unwanted light rays as shown in Figure 1-17. It is good practice to have a
lens hood or lens shade mounted to your lens at all times.
Figure 1-17.
Optical flare eliminated
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