Half-plate, anamorphic lens by Vevers. By C.C. Vevers of Leeds 5" F. Rotating aperture plate with four apertures: f.17,23,35,46. RR construction. Vevers half plate wide angle lens
C.C.Vevers lens F:8 inch for 7 x 5 inch plates. Achromatic, f/8-44 with an iris diaphragm. Vevers Rapid View Lens