High Refractive Index (n≈1.62) Compared to standard optical glass (e.g., BK7, n≈1.517), K26R offers a higher refractive index. Enables more compact optical designs while maintaining the same focal length — ideal for miniaturized optical systems.
Low Abbe Number (Vd≈36) Indicates moderate dispersion, which makes it suitable for achromatic or apochromatic correction when paired with high-Abbe materials (e.g., FPL51 or F2). Helps reduce chromatic aberration in precision imaging systems.
High Transmittance Excellent optical transmittance in the visible range (400–700 nm). With proper coatings, transmission can exceed 99%, making it suitable for high-brightness or laser optical systems.
🔹 Mechanical and Environmental Stability
Excellent Thermal Stability Low coefficient of thermal expansion (CTE); Focal length changes minimally with temperature fluctuations — ideal for outdoor or military optical devices.
Good Machinability Easier to polish and coat.
High Resistance to Humidity
🔹 Typical Applications
Laser sights, holographic sights, and optical aiming systems
High-end photographic and microscope lenses
Optical collimators, rangefinders, and aerospace optics
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