Lens showing manufacture process
1950-1983
Selection of eleven glass lenses in various stages of polishing and grinding to make an achromatic doublet lens, by J. H. Dallmeyer Limited, London, England, 1950-1983
1950-1983
1950-1983
1950-1983
1950-1983
1950-1983
1950-1983
1950-1983
1950-1983
1950-1983
1950-1983
1950-1983