The Importance of Match- ing Lens to CCD
More than 200 years ago, Newton showed that white light was composed of multiple wavelengths, (RGB) which are now called photons. These waves of light pass through a lens on a camera and are supposed to be “imaged” at the same point, onto film emulsion for example. When the pho- tons are not imaged properly onto the film plane, chromatic aberration occurs and is most commonly caused by using single lens construction. Incorporating two lenses made of different materials can solve chromatic aberration with film camera lenses. The net effect of chromatic aberration is un- intended color artifacts such as halos and wild colors.
The marriage between lens and CCD is critical to delivering the best possible images. Post imaging processing can only do so much to help a poor image. Remember the old axiom, garbage in - garbage out.
The same holds true for uncorrected lenses made for digital cameras and the net effect it causes are unwanted artifacts, noise and a degraded image. Unbeknownst to many in the industry, digital camera lenses require different construction than film camera lenses. If a manufacturer, (and some do) tries to place a lens designed for a film camera onto a digital camera, the net effect is chromatic aberration and only a small portion of the lens will actually throw light onto the CCD. This gross
The digital camera lens construction of the CAMEDIA
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causes a digital form of chromatic aberration. Film emulsion layers are designed to read light from an oblique angle and the
The CAMEDIA
Elements and Interaction with the CCD
Lens Elements
Film
Emulsion
Layers
Lens Elements
CCD
Sensor
Light - Photons