The lens assy. Made by Ilex. Has built in iris. Cooke Triplet Specs. 100mm F.L. 3.3, Mgf2 coating.
Barrel is threaded on both ends.
Ideal for making an artificial star. 28mm f2.8 Macro Lens with Pentax screw mount. Has click stops to f22. Made in Japan for JML Optical. Designed for Distortionless Wide Angle Mapping.