Achromat VIS, Ø 6 mm, f = 18 mm, mounted, ARB2

Cemented achromatic doublet for the visible, Ø 6 mm, focal length 18 mm, in a mount. Crown and flint elements are matched to minimise chromatic and spherical aberration; ARB2 broadband AR coating. Laser-centred for accurate alignment of the optical axis to the edge.