Material: Optical Glass Key benefits - Provides durable, stable optical components for long-term microscope use - Precise tolerances support repeatable imaging and reliable alignment in assemblies - Clear code-based options allow quick identification of diameter, focal length, and coating color Key specifications - Combined image quality: 1/4-1/8 - Diameter tolerance: +0 / -0.12 mm - Center thickness tolerance: ±0.2 mm - Focal length tolerance: ±0.1% - Surface quality: 60/40 - Eccentricity: 1' Coating and options - Option Description: For example, selecting 61.5F228G means diameter 61.5 mm, focal length 228 mm, and green coating (G) - B indicates blue coating film Code guidance - The code structure expresses diameter, focal length, and coating color - G denotes green coating; B denotes blue coating Durability and quality assurance - Our microscope accessories are made of high-quality materials to ensure durability and stability for long-term use Applications and use scenarios - Building or upgrading microscope setups that require standardized and traceable optic components - Quality control and inspection tasks where consistent imaging and measurements are essential - Educational laboratories or demonstrations needing reliable, repeatable optics with simple code-based configuration