Plano-concave lens, N-BK7, Ø 8 mm, f = -8 mm, mounted, ARHS-YAG

Plano-concave singlet in N-BK7, Ø 8 mm, focal length -8 mm, in a mount. ARHS-YAG V-coat coating. Negative focal length: diverges the beam, for beam expanders and to shorten system length.