Achromat VIS, Ø 25.4 mm, f = 140 mm, mounted, ARB2

Cemented achromatic doublet for the visible, Ø 25.4 mm, focal length 140 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.