Optical glass type S-LAM73: highest refractive index among glass types with negative dn/dT.

Type Code nc nd nF ng vd s.g. Coloring
S-LAM73 794371 1.78732 1.79360 1.80872 1.82119 37.09 4.45 415/350

S-LAM73 is an Optical Glass With Negative dn/dT.

In Automotive camera lens systems, the focal length is often a fixed distance. Refractive index fluctuations within the optical system should certainly be a consideration, as cars are used in environments where the temperature range can vary widely from below zero in colder climates to more that 50°C inside a car on a summer day. Since many optical glasses have positive dn/dT values, the refractive indices fluctuations due to temperature change can be adjusted efficiently when these materials are combined with S-LAM73. In addition to Automotive camera lens systems, S-LAM73 can also be used for Projectors, Interchangeable Photographic lenses, and various other applications.


  • Negative dn/dT
  • The highest refractive index among glasses with negative dn/dT and low dispersion