Refractive index database

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Optical constants of SCHOTT - SF (Dense flint)

Wavelength: µm

Complex refractive index (n+ik)[ i ]

n   k   LogX   LogY   eV

Derived optical constants

Dispersion formula [ i ]


Conditions & Spec sheet

n_is_absolute: false
wavelength_is_vacuum: false
temperature: 20.0 °C
  - type: "Schott formula"
    coefficients: -2.51e-07 1.07e-08 -2.4e-11 7.85e-07 1.15e-09 0.278
nd: 1.67271
Vd: 32.25
glass_code: 673323.286
glass_status: standard
density: 2.858 g/cm3
  - temperature_range: -30 70 °C
    coefficient: 7.94e-06 K-1
  - temperature_range: 20 300 °C
    coefficient: 9.21e-06 K-1
dPgF: 0.0088
climatic_resistance: 1.0
stain_resistance: 0.0
acid_resistance: 1.0
alkali_resistance: 1.0
phosphate_resistance: 1.0


step 0.5 available


SCHOTT Zemax catalog 2017-01-20b (obtained from
See also SCHOTT glass data sheets


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SF5 optical glass

SF5 is a type of optical glass characterized by its high refractive index and moderate to high dispersion, indicated by a lower Abbe number. This makes it particularly useful in applications where significant light bending capabilities are needed, such as in the design of compact lenses. However, the higher dispersion means that it tends to separate different wavelengths of light more than other types of glass, which can lead to chromatic aberration if not properly managed. To counteract this, SF5 is often paired with other types of optical glass in complex lens systems to optimize performance across a range of wavelengths. Common applications for SF5 glass include high-quality camera lenses, microscopes, and other optical instruments where precise image quality is paramount. Though it is generally more expensive than standard optical glasses like BK7, its specialized properties make SF5 a valuable resource for optical designers aiming to achieve superior optical performance.

SF5 and similar glasses produced by different makers

Maker Glass
Schott N-SF5
Hikari E-SF5
Sumita K-SFLD5


SCHOTT AG is a German multinational company renowned for its expertise in specialty glass and glass-ceramics. Founded in 1884, the company has been a pioneer in the field, with innovations that have significantly impacted a variety of industries, including healthcare, home appliances, electronics, and optics. In the optical domain, SCHOTT offers a comprehensive range of high-quality glass types, including crown and flint glasses, as well as specialty materials like laser glasses and radiation-shielding glasses. These materials are used in a myriad of applications, from consumer electronics and camera lenses to scientific instruments and aerospace technologies. SCHOTT's glass products are highly regarded for their quality, consistency, and durability, meeting rigorous industry standards. With a strong focus on research and development, the company has continued to introduce innovative products that address the evolving needs of the optical industry. SCHOTT's commitment to quality and innovation has established it as a leading provider of specialty glass solutions, making it a go-to choice for designers and manufacturers seeking high-performance materials. SCHOTT also publishes a glass catalog (SCHOTT Optical Glass Datasheets), which is a standard reference for the properties of many optical glasses.

External links


Glass is a versatile, amorphous material that has been an essential component in optical technologies for centuries. Comprising mainly of silica along with various additives like soda, lime, or boron, glass can be engineered to exhibit a wide range of optical properties, such as refractive indices and dispersion characteristics. In the optical industry, specialized types of glass like crown, flint, and extra-low dispersion (ED) glasses are used for manufacturing lenses, prisms, and other optical elements. These glasses are precisely formulated to offer specific properties, such as low chromatic aberration or high light transmittance across different spectral ranges. Glass can also be coated with thin layers of materials like anti-reflective coatings to enhance its optical performance. More recently, advances in photonics and nanotechnology have led to the development of innovative glass types, such as photonic crystal and metamaterial glasses, which exhibit unique light-manipulating properties. It is crucial to note that the optical properties of glass, including its refractive index, can vary depending on its composition and temperature, making it important to consult specific data for particular applications. Overall, glass remains a foundational material in optics, its wide applicability owed to its tunable properties and general robustness.

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