Extra-Low Dispersion Glass All photographs are made with light, composed of many colors of the spectrum.
What is low dispersion glass?
Low dispersion glass and its variants - ultra-low dispersion (UD) glass, extra-low dispersion (ED) glass - is expensive optical glass which can reduce unwanted colour fringing and other optical problems in lenses, ...
LD
Low dispersion glass, or UD (ultra low dispersion) or SD (Super Low dispersion), please refer to "ED", basically, refers to optically superior glass - price too! Dispersion sometimes also refer as "colour fringing".
"ED" is extra-low dispersion glass, a more expensive and higher-quality glass that reduces chromatic aberration or "color fringing".
6L IS USM lens features two UD ultra-low dispersion glass elements for enhanced sharpness, L-series weather and dust sealing for shooting in harsh conditions, improved mechanical design, ...
SAL-18200 18-200mm DT Lens [2], f/3.5-6.3 aperture, ED (Extra-low Dispersion Glass), 15 elements in 13 groups, Max magnification of 0.27, Circular Aperture(7 Blades), Angle of View(APS-C) 76ﾟ-8ﾟ, Filter Diameter: 62mm
[edit] Tamron ...
Lenses made from extra low dispersion glass have less air bubbles and glass deformities that are more likely to cause image distortion.
- 28mm equiv.
- F2.4
- Ricoh GR Lens
- 6 elements including low dispersion glass and two molded aspherical elements
- Seven-bladed aperture diaphragm ...
Nikon 60mm f/2.8G AF-S Micro - Nikkor Auto Focus Lens with Extra-low Dispersion Glass, 5 Year U.S.A. Warranty
$569.95
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The lightweight lens uses Special Low Dispersion glass that provides superb correction of chromatic aberration, meaning high image quality is assured throughout the entire zoom range.
 See also: Photograph, Camera, Photography, Lens, Element
  
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