S-LAM73 is an optical glass which has negative dn/dT at the region of LAM.
Cars are used in environments where the temperature change is large from below zero (cold district) to more than 50 °C (inside car in summer). In the optical system of Automotive camera lenses, it's common that the focal length is fixed
- Negative dn/dT at the region of LAM dn/dT(DLine 40°C ~ 60°C) -0,8
- The highest refractive index among glasses with negative dn/dT at the region of low dispersion nd approximately 1,8