and..I just got myself some Tactical "yellowcake" gentlemen..."lenses manufactured by Minolta and are identifiable by their milled metal focusing ring, and plain metal (ie. unpainted) aperture ring. Introduced progressively from 1966 as they were developed, by 1970 they had completely replaced the earlier Pre-MC lenses. The quality of the coatings on these lenses is as a general rule not as good as those on later MC and MD lenses, and in some cases radioactive compounds of thorium and lanthanum were added to the glass mixture to increase the refractive index. This is apparent in some of the faster lenses such as the 58mm f/1.2 and 85mm f/1.7, where some early versions that included this glass have had their radioactive ingredients progressively decay, discolouring the glass, and giving the images taken with the affected lenses a very warm cast." exacly ! this one! rokkor pf 1:18 45 mm