Curved-Field Lenses are not recommended for general purpose slide projection; refer to KODAK FF lenses. For best results under most conditions, use a flat-field lens.
Curved-field lenses are optically designed to correct for a natural curvature of film in some open-face mounts. Not for use with glass mounted slides. Not for use in rear projection applications. Not for use with some open-faced mounts that have been created using an automated system which flattens the film surface and eliminates pillow curve.
Curved Field Lenses
102 mm f/2.8 - B&H# KO10228C (Kodak Cat. No. 1782382) 102 to 152 mm f/3.5 - B&H# KO102152C (Kodak Cat. No. 1414457)