OSE-DLB
Achromatic Doublets
                        Acromatic doublets are cemented achromats consisting of two different lenses: Positive low dispersion crown glass and negative high dispersion flint glass.
                     
    OSE-DLB
OSE-S-DLB
An economical achromat for general use, suitable for an optical system that does not require high surface quality imaging, such as a microscope or telescope objective.
OSE-DL-PNIR
OSE-CDL
OSE-UDL-NUDL
OSE-HFDLSQ
OSE-NYDL