Why Color Dispersion?
Lens-Construction Uncorrected lenses can act like prisms, splitting white light and dispersing its constituent colors, to create fringes of color at the edge of objects in a picture.
This is because the speed of light in glass depends on its color the red, green and blue light rays are blend to different extents and brought to a different focus.
Using APO Lenses
Apochoromatic (APO) lenses use special low-dispersion glasses in sophisticated combinations to focus all the colors at precisely the same level. Its a photographic lens that has better correction of chromatic and spherical aberration than the much more common achromat lenses.
The new multi-layer lens coating and lens design of some quality makes reduces flare and ghosting, and creates an optimum color balance through the entire zoom range. Canon L series, Sigma APO series are within this range.
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These use special optical designs and optical materials (SLD or ELD glass) to improve their performance. The result is images which have greater contrast, sharpness and color definition than a comparable non-APO type lens.
Sigma lenses
Sigma uses one aspherical lens and three SLD (Special Low Dispersion) glass elements for excellent correction all types of aberration, making high-quality images a reality throughout the entire zoom range.
There are many who feel that some Sigma lenses have a better optical quality than canon’s L series of lenses.
Some Sigma lenses are equipped with ELD (Extra Low Dispersion) glass elements. Two ELD glass elements in the front lens elements reduce chromatic aberration to a minimum and also ensure sharp, quality images of high contrast.
About SIGMA
In mathematics, SIGMA is a sign used to show the total sum. However for photographers, Sigma is the world’s leading brand of lenses and cameras. Sigma ensures a high, consistent level of quality by processing its own high-performance Special Low Dispersion glass (SLD), metal and resins, surface treatments and other elements right there inside their factory.
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