lotus

previous page: 29. What are "elements" and "groups", and are more better?
  
page up: Photographic Lenses FAQ
  
next page: 31. What do APO and Apochromatic mean?

30. What is "low dispersion glass".




Description

This article is from the Photographic Lenses FAQ, by David Jacobson with numerous contributions by others.

30. What is "low dispersion glass".

Low dispersion glass is specially formulated to have a small variation of index of refraction with wavelength. This makes it easier for the designer to reduce chromatic aberration and lateral color. This kind of glass is most often used in long lenses. Marketing designators such as ED and SLD hint at the use of low-dispersion glass.

 

Continue to:













TOP
previous page: 29. What are "elements" and "groups", and are more better?
  
page up: Photographic Lenses FAQ
  
next page: 31. What do APO and Apochromatic mean?