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Focal length Calculator for singlet lens A useful tools for calculating focal length of singlet lens. Including 4 glass databases Calculated results including edge thk, bfl, ffl, weight. Automatically search similar products in our database. Focal length Calculator for muti-lenses Max. 10 lenses. Calculated results including efl, bfl, ffl. Centration Sag & Radius Optical Density & Transmission Optical dictionary A useful dictionary for optical glossary |