S-FPM4 is an optical glass for polishing lens and effective for secondary chromatic aberration correction in FPM Region.
S-FPM4 has high partial dispersion ratios θg,F in the FPM region, and is an optical glass for polishing lenses that is effective for secondary chromatic aberration correction. A glass material that can be used in a wide range of applications, such as interchangeable and automotive lenses.
High partial dispersion ratios θg,F
|Eco Optical Glass||○|
|Refractive Index nd||1.52841|
|Abbe Number νd||76.46|
|Partial dispersion ratio θg,F||0.5396|
|Abnormal dispersibility ⊿θg.F||0.0218|
|Transformation Point Tg(°C)||488|
|Yield Point At(°C)||520|
|Knoop Hardness Hk||360〔4〕|
|Detail Catalog DATA|
•saw cut center-less ground