Derogy France brass lens Rectilineaire Aplanetique No. 4 ½, c. 1894
'Derogy Réctilinéaire Aplanétique No. 4 ½, c. 1894
Derogy, Paris. Brass lens no. 30025, 8/40 cm, iris aperture from 8 to 44, height with sunshade 10,5 cm, connection ring for Ø 67,4 mm. Good condition!